scripts/checkpatch.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2001, Dave Jones. (the file handling bit)
   3 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   4 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   5 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   6 # Licensed under the terms of the GNU GPL License version 2
   7
   8 use strict;
   9 use POSIX;
  10 use File::Basename;
  11 use Cwd 'abs_path';
  12
  13 my $P = $0;
  14 my $D = dirname(abs_path($P));
  15
  16 my $V = '0.32';
  17
  18 use Getopt::Long qw(:config no_auto_abbrev);
  19
  20 my $quiet = 0;
  21 my $tree = 1;
  22 my $chk_signoff = 1;
  23 my $chk_patch = 1;
  24 my $tst_only;
  25 my $emacs = 0;
  26 my $terse = 0;
  27 my $file = 0;
  28 my $check = 0;
  29 my $check_orig = 0;
  30 my $summary = 1;
  31 my $mailback = 0;
  32 my $summary_file = 0;
  33 my $show_types = 0;
  34 my $fix = 0;
  35 my $fix_inplace = 0;
  36 my $root;
  37 my %debug;
  38 my %camelcase = ();
  39 my %use_type = ();
  40 my @use = ();
  41 my %ignore_type = ();
  42 my @ignore = ();
  43 my $help = 0;
  44 my $configuration_file = ".checkpatch.conf";
  45 my $max_line_length = 80;
  46 my $ignore_perl_version = 0;
  47 my $minimum_perl_version = 5.10.0;
  48 my $min_conf_desc_length = 4;
  49 my $spelling_file = "$D/spelling.txt";
  50
  51 sub help {
  52         my ($exitcode) = @_;
  53
  54         print << "EOM";
  55 Usage: $P [OPTION]... [FILE]...
  56 Version: $V
  57
  58 Options:
  59   -q, --quiet                quiet
  60   --no-tree                  run without a kernel tree
  61   --no-signoff               do not check for 'Signed-off-by' line
  62   --patch                    treat FILE as patchfile (default)
  63   --emacs                    emacs compile window format
  64   --terse                    one line per report
  65   -f, --file                 treat FILE as regular source file
  66   --subjective, --strict     enable more subjective tests
  67   --types TYPE(,TYPE2...)    show only these comma separated message types
  68   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  69   --max-line-length=n        set the maximum line length, if exceeded, warn
  70   --min-conf-desc-length=n   set the min description length, if shorter, warn
  71   --show-types               show the message "types" in the output
  72   --root=PATH                PATH to the kernel tree root
  73   --no-summary               suppress the per-file summary
  74   --mailback                 only produce a report in case of warnings/errors
  75   --summary-file             include the filename in summary
  76   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  77                              'values', 'possible', 'type', and 'attr' (default
  78                              is all off)
  79   --test-only=WORD           report only warnings/errors containing WORD
  80                              literally
  81   --fix                      EXPERIMENTAL - may create horrible results
  82                              If correctable single-line errors exist, create
  83                              "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
  84                              with potential errors corrected to the preferred
  85                              checkpatch style
  86   --fix-inplace              EXPERIMENTAL - may create horrible results
  87                              Is the same as --fix, but overwrites the input
  88                              file.  It's your fault if there's no backup or git
  89   --ignore-perl-version      override checking of perl version.  expect
  90                              runtime errors.
  91   -h, --help, --version      display this help and exit
  92
  93 When FILE is - read standard input.
  94 EOM
  95
  96         exit($exitcode);
  97 }
  98
  99 my $conf = which_conf($configuration_file);
 100 if (-f $conf) {
 101         my @conf_args;
 102         open(my $conffile, '<', "$conf")
 103             or warn "$P: Can't find a readable $configuration_file file $!\n";
 104
 105         while (<$conffile>) {
 106                 my $line = $_;
 107
 108                 $line =~ s/\s*\n?$//g;
 109                 $line =~ s/^\s*//g;
 110                 $line =~ s/\s+/ /g;
 111
 112                 next if ($line =~ m/^\s*#/);
 113                 next if ($line =~ m/^\s*$/);
 114
 115                 my @words = split(" ", $line);
 116                 foreach my $word (@words) {
 117                         last if ($word =~ m/^#/);
 118                         push (@conf_args, $word);
 119                 }
 120         }
 121         close($conffile);
 122         unshift(@ARGV, @conf_args) if @conf_args;
 123 }
 124
 125 GetOptions(
 126         'q|quiet+'      => \$quiet,
 127         'tree!'         => \$tree,
 128         'signoff!'      => \$chk_signoff,
 129         'patch!'        => \$chk_patch,
 130         'emacs!'        => \$emacs,
 131         'terse!'        => \$terse,
 132         'f|file!'       => \$file,
 133         'subjective!'   => \$check,
 134         'strict!'       => \$check,
 135         'ignore=s'      => \@ignore,
 136         'types=s'       => \@use,
 137         'show-types!'   => \$show_types,
 138         'max-line-length=i' => \$max_line_length,
 139         'min-conf-desc-length=i' => \$min_conf_desc_length,
 140         'root=s'        => \$root,
 141         'summary!'      => \$summary,
 142         'mailback!'     => \$mailback,
 143         'summary-file!' => \$summary_file,
 144         'fix!'          => \$fix,
 145         'fix-inplace!'  => \$fix_inplace,
 146         'ignore-perl-version!' => \$ignore_perl_version,
 147         'debug=s'       => \%debug,
 148         'test-only=s'   => \$tst_only,
 149         'h|help'        => \$help,
 150         'version'       => \$help
 151 ) or help(1);
 152
 153 help(0) if ($help);
 154
 155 $fix = 1 if ($fix_inplace);
 156 $check_orig = $check;
 157
 158 my $exit = 0;
 159
 160 if ($^V && $^V lt $minimum_perl_version) {
 161         printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
 162         if (!$ignore_perl_version) {
 163                 exit(1);
 164         }
 165 }
 166
 167 if ($#ARGV < 0) {
 168         print "$P: no input files\n";
 169         exit(1);
 170 }
 171
 172 sub hash_save_array_words {
 173         my ($hashRef, $arrayRef) = @_;
 174
 175         my @array = split(/,/, join(',', @$arrayRef));
 176         foreach my $word (@array) {
 177                 $word =~ s/\s*\n?$//g;
 178                 $word =~ s/^\s*//g;
 179                 $word =~ s/\s+/ /g;
 180                 $word =~ tr/[a-z]/[A-Z]/;
 181
 182                 next if ($word =~ m/^\s*#/);
 183                 next if ($word =~ m/^\s*$/);
 184
 185                 $hashRef->{$word}++;
 186         }
 187 }
 188
 189 sub hash_show_words {
 190         my ($hashRef, $prefix) = @_;
 191
 192         if ($quiet == 0 && keys %$hashRef) {
 193                 print "NOTE: $prefix message types:";
 194                 foreach my $word (sort keys %$hashRef) {
 195                         print " $word";
 196                 }
 197                 print "\n\n";
 198         }
 199 }
 200
 201 hash_save_array_words(\%ignore_type, \@ignore);
 202 hash_save_array_words(\%use_type, \@use);
 203
 204 my $dbg_values = 0;
 205 my $dbg_possible = 0;
 206 my $dbg_type = 0;
 207 my $dbg_attr = 0;
 208 for my $key (keys %debug) {
 209         ## no critic
 210         eval "\${dbg_$key} = '$debug{$key}';";
 211         die "$@" if ($@);
 212 }
 213
 214 my $rpt_cleaners = 0;
 215
 216 if ($terse) {
 217         $emacs = 1;
 218         $quiet++;
 219 }
 220
 221 if ($tree) {
 222         if (defined $root) {
 223                 if (!top_of_kernel_tree($root)) {
 224                         die "$P: $root: --root does not point at a valid tree\n";
 225                 }
 226         } else {
 227                 if (top_of_kernel_tree('.')) {
 228                         $root = '.';
 229                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 230                                                 top_of_kernel_tree($1)) {
 231                         $root = $1;
 232                 }
 233         }
 234
 235         if (!defined $root) {
 236                 print "Must be run from the top-level dir. of a kernel tree\n";
 237                 exit(2);
 238         }
 239 }
 240
 241 my $emitted_corrupt = 0;
 242
 243 our $Ident      = qr{
 244                         [A-Za-z_][A-Za-z\d_]*
 245                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 246                 }x;
 247 our $Storage    = qr{extern|static|asmlinkage};
 248 our $Sparse     = qr{
 249                         __user|
 250                         __kernel|
 251                         __force|
 252                         __iomem|
 253                         __must_check|
 254                         __init_refok|
 255                         __kprobes|
 256                         __ref|
 257                         __rcu
 258                 }x;
 259 our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
 260 our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
 261 our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
 262 our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
 263 our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};
 264
 265 # Notes to $Attribute:
 266 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 267 our $Attribute  = qr{
 268                         const|
 269                         __percpu|
 270                         __nocast|
 271                         __safe|
 272                         __bitwise__|
 273                         __packed__|
 274                         __packed2__|
 275                         __naked|
 276                         __maybe_unused|
 277                         __always_unused|
 278                         __noreturn|
 279                         __used|
 280                         __cold|
 281                         __pure|
 282                         __noclone|
 283                         __deprecated|
 284                         __read_mostly|
 285                         __kprobes|
 286                         $InitAttribute|
 287                         ____cacheline_aligned|
 288                         ____cacheline_aligned_in_smp|
 289                         ____cacheline_internodealigned_in_smp|
 290                         __weak
 291                   }x;
 292 our $Modifier;
 293 our $Inline     = qr{inline|__always_inline|noinline|__inline|__inline__};
 294 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 295 our $Lval       = qr{$Ident(?:$Member)*};
 296
 297 our $Int_type   = qr{(?i)llu|ull|ll|lu|ul|l|u};
 298 our $Binary     = qr{(?i)0b[01]+$Int_type?};
 299 our $Hex        = qr{(?i)0x[0-9a-f]+$Int_type?};
 300 our $Int        = qr{[0-9]+$Int_type?};
 301 our $Octal      = qr{0[0-7]+$Int_type?};
 302 our $String     = qr{"[X\t]*"};
 303 our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 304 our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 305 our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 306 our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 307 our $Constant   = qr{$Float|$Binary|$Octal|$Hex|$Int};
 308 our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 309 our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
 310 our $Arithmetic = qr{\+|-|\*|\/|%};
 311 our $Operators  = qr{
 312                         <=|>=|==|!=|
 313                         =>|->|<<|>>|<|>|!|~|
 314                         &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
 315                   }x;
 316
 317 our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;
 318
 319 our $NonptrType;
 320 our $NonptrTypeMisordered;
 321 our $NonptrTypeWithAttr;
 322 our $Type;
 323 our $TypeMisordered;
 324 our $Declare;
 325 our $DeclareMisordered;
 326
 327 our $NON_ASCII_UTF8     = qr{
 328         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 329         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 330         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 331         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 332         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 333         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 334         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 335 }x;
 336
 337 our $UTF8       = qr{
 338         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 339         | $NON_ASCII_UTF8
 340 }x;
 341
 342 our $typeOtherOSTypedefs = qr{(?x:
 343         u_(?:char|short|int|long) |          # bsd
 344         u(?:nchar|short|int|long)            # sysv
 345 )};
 346
 347 our $typeTypedefs = qr{(?x:
 348         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 349         atomic_t
 350 )};
 351
 352 our $logFunctions = qr{(?x:
 353         printk(?:_ratelimited|_once|)|
 354         (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 355         WARN(?:_RATELIMIT|_ONCE|)|
 356         panic|
 357         MODULE_[A-Z_]+|
 358         seq_vprintf|seq_printf|seq_puts
 359 )};
 360
 361 our $signature_tags = qr{(?xi:
 362         Signed-off-by:|
 363         Acked-by:|
 364         Tested-by:|
 365         Reviewed-by:|
 366         Reported-by:|
 367         Suggested-by:|
 368         To:|
 369         Cc:
 370 )};
 371
 372 our @typeListMisordered = (
 373         qr{char\s+(?:un)?signed},
 374         qr{int\s+(?:(?:un)?signed\s+)?short\s},
 375         qr{int\s+short(?:\s+(?:un)?signed)},
 376         qr{short\s+int(?:\s+(?:un)?signed)},
 377         qr{(?:un)?signed\s+int\s+short},
 378         qr{short\s+(?:un)?signed},
 379         qr{long\s+int\s+(?:un)?signed},
 380         qr{int\s+long\s+(?:un)?signed},
 381         qr{long\s+(?:un)?signed\s+int},
 382         qr{int\s+(?:un)?signed\s+long},
 383         qr{int\s+(?:un)?signed},
 384         qr{int\s+long\s+long\s+(?:un)?signed},
 385         qr{long\s+long\s+int\s+(?:un)?signed},
 386         qr{long\s+long\s+(?:un)?signed\s+int},
 387         qr{long\s+long\s+(?:un)?signed},
 388         qr{long\s+(?:un)?signed},
 389 );
 390
 391 our @typeList = (
 392         qr{void},
 393         qr{(?:(?:un)?signed\s+)?char},
 394         qr{(?:(?:un)?signed\s+)?short\s+int},
 395         qr{(?:(?:un)?signed\s+)?short},
 396         qr{(?:(?:un)?signed\s+)?int},
 397         qr{(?:(?:un)?signed\s+)?long\s+int},
 398         qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
 399         qr{(?:(?:un)?signed\s+)?long\s+long},
 400         qr{(?:(?:un)?signed\s+)?long},
 401         qr{(?:un)?signed},
 402         qr{float},
 403         qr{double},
 404         qr{bool},
 405         qr{struct\s+$Ident},
 406         qr{union\s+$Ident},
 407         qr{enum\s+$Ident},
 408         qr{${Ident}_t},
 409         qr{${Ident}_handler},
 410         qr{${Ident}_handler_fn},
 411         @typeListMisordered,
 412 );
 413 our @typeListWithAttr = (
 414         @typeList,
 415         qr{struct\s+$InitAttribute\s+$Ident},
 416         qr{union\s+$InitAttribute\s+$Ident},
 417 );
 418
 419 our @modifierList = (
 420         qr{fastcall},
 421 );
 422
 423 our @mode_permission_funcs = (
 424         ["module_param", 3],
 425         ["module_param_(?:array|named|string)", 4],
 426         ["module_param_array_named", 5],
 427         ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
 428         ["proc_create(?:_data|)", 2],
 429         ["(?:CLASS|DEVICE|SENSOR)_ATTR", 2],
 430 );
 431
 432 #Create a search pattern for all these functions to speed up a loop below
 433 our $mode_perms_search = "";
 434 foreach my $entry (@mode_permission_funcs) {
 435         $mode_perms_search .= '|' if ($mode_perms_search ne "");
 436         $mode_perms_search .= $entry->[0];
 437 }
 438
 439 our $allowed_asm_includes = qr{(?x:
 440         irq|
 441         memory|
 442         time|
 443         reboot
 444 )};
 445 # memory.h: ARM has a custom one
 446
 447 # Load common spelling mistakes and build regular expression list.
 448 my $misspellings;
 449 my %spelling_fix;
 450
 451 if (open(my $spelling, '<', $spelling_file)) {
 452         my @spelling_list;
 453         while (<$spelling>) {
 454                 my $line = $_;
 455
 456                 $line =~ s/\s*\n?$//g;
 457                 $line =~ s/^\s*//g;
 458
 459                 next if ($line =~ m/^\s*#/);
 460                 next if ($line =~ m/^\s*$/);
 461
 462                 my ($suspect, $fix) = split(/\|\|/, $line);
 463
 464                 push(@spelling_list, $suspect);
 465                 $spelling_fix{$suspect} = $fix;
 466         }
 467         close($spelling);
 468         $misspellings = join("|", @spelling_list);
 469 } else {
 470         warn "No typos will be found - file '$spelling_file': $!\n";
 471 }
 472
 473 sub build_types {
 474         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 475         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 476         my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
 477         my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
 478         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 479         $NonptrType     = qr{
 480                         (?:$Modifier\s+|const\s+)*
 481                         (?:
 482                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 483                                 (?:$typeOtherOSTypedefs\b)|
 484                                 (?:$typeTypedefs\b)|
 485                                 (?:${all}\b)
 486                         )
 487                         (?:\s+$Modifier|\s+const)*
 488                   }x;
 489         $NonptrTypeMisordered   = qr{
 490                         (?:$Modifier\s+|const\s+)*
 491                         (?:
 492                                 (?:${Misordered}\b)
 493                         )
 494                         (?:\s+$Modifier|\s+const)*
 495                   }x;
 496         $NonptrTypeWithAttr     = qr{
 497                         (?:$Modifier\s+|const\s+)*
 498                         (?:
 499                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 500                                 (?:$typeTypedefs\b)|
 501                                 (?:$typeOtherOSTypedefs\b)|
 502                                 (?:${allWithAttr}\b)
 503                         )
 504                         (?:\s+$Modifier|\s+const)*
 505                   }x;
 506         $Type   = qr{
 507                         $NonptrType
 508                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
 509                         (?:\s+$Inline|\s+$Modifier)*
 510                   }x;
 511         $TypeMisordered = qr{
 512                         $NonptrTypeMisordered
 513                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
 514                         (?:\s+$Inline|\s+$Modifier)*
 515                   }x;
 516         $Declare        = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
 517         $DeclareMisordered      = qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
 518 }
 519 build_types();
 520
 521 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 522
 523 # Using $balanced_parens, $LvalOrFunc, or $FuncArg
 524 # requires at least perl version v5.10.0
 525 # Any use must be runtime checked with $^V
 526
 527 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 528 our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
 529 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};
 530
 531 our $declaration_macros = qr{(?x:
 532         (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,2}\s*\(|
 533         (?:$Storage\s+)?LIST_HEAD\s*\(|
 534         (?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(
 535 )};
 536
 537 sub deparenthesize {
 538         my ($string) = @_;
 539         return "" if (!defined($string));
 540
 541         while ($string =~ /^\s*\(.*\)\s*$/) {
 542                 $string =~ s@^\s*\(\s*@@;
 543                 $string =~ s@\s*\)\s*$@@;
 544         }
 545
 546         $string =~ s@\s+@ @g;
 547
 548         return $string;
 549 }
 550
 551 sub seed_camelcase_file {
 552         my ($file) = @_;
 553
 554         return if (!(-f $file));
 555
 556         local $/;
 557
 558         open(my $include_file, '<', "$file")
 559             or warn "$P: Can't read '$file' $!\n";
 560         my $text = <$include_file>;
 561         close($include_file);
 562
 563         my @lines = split('\n', $text);
 564
 565         foreach my $line (@lines) {
 566                 next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
 567                 if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
 568                         $camelcase{$1} = 1;
 569                 } elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
 570                         $camelcase{$1} = 1;
 571                 } elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
 572                         $camelcase{$1} = 1;
 573                 }
 574         }
 575 }
 576
 577 my $camelcase_seeded = 0;
 578 sub seed_camelcase_includes {
 579         return if ($camelcase_seeded);
 580
 581         my $files;
 582         my $camelcase_cache = "";
 583         my @include_files = ();
 584
 585         $camelcase_seeded = 1;
 586
 587         if (-e ".git") {
 588                 my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
 589                 chomp $git_last_include_commit;
 590                 $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
 591         } else {
 592                 my $last_mod_date = 0;
 593                 $files = `find $root/include -name "*.h"`;
 594                 @include_files = split('\n', $files);
 595                 foreach my $file (@include_files) {
 596                         my $date = POSIX::strftime("%Y%m%d%H%M",
 597                                                    localtime((stat $file)[9]));
 598                         $last_mod_date = $date if ($last_mod_date < $date);
 599                 }
 600                 $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
 601         }
 602
 603         if ($camelcase_cache ne "" && -f $camelcase_cache) {
 604                 open(my $camelcase_file, '<', "$camelcase_cache")
 605                     or warn "$P: Can't read '$camelcase_cache' $!\n";
 606                 while (<$camelcase_file>) {
 607                         chomp;
 608                         $camelcase{$_} = 1;
 609                 }
 610                 close($camelcase_file);
 611
 612                 return;
 613         }
 614
 615         if (-e ".git") {
 616                 $files = `git ls-files "include/*.h"`;
 617                 @include_files = split('\n', $files);
 618         }
 619
 620         foreach my $file (@include_files) {
 621                 seed_camelcase_file($file);
 622         }
 623
 624         if ($camelcase_cache ne "") {
 625                 unlink glob ".checkpatch-camelcase.*";
 626                 open(my $camelcase_file, '>', "$camelcase_cache")
 627                     or warn "$P: Can't write '$camelcase_cache' $!\n";
 628                 foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
 629                         print $camelcase_file ("$_\n");
 630                 }
 631                 close($camelcase_file);
 632         }
 633 }
 634
 635 sub git_commit_info {
 636         my ($commit, $id, $desc) = @_;
 637
 638         return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
 639
 640         my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
 641         $output =~ s/^\s*//gm;
 642         my @lines = split("\n", $output);
 643
 644         return ($id, $desc) if ($#lines < 0);
 645
 646         if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
 647 # Maybe one day convert this block of bash into something that returns
 648 # all matching commit ids, but it's very slow...
 649 #
 650 #               echo "checking commits $1..."
 651 #               git rev-list --remotes | grep -i "^$1" |
 652 #               while read line ; do
 653 #                   git log --format='%H %s' -1 $line |
 654 #                   echo "commit $(cut -c 1-12,41-)"
 655 #               done
 656         } elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
 657         } else {
 658                 $id = substr($lines[0], 0, 12);
 659                 $desc = substr($lines[0], 41);
 660         }
 661
 662         return ($id, $desc);
 663 }
 664
 665 $chk_signoff = 0 if ($file);
 666
 667 my @rawlines = ();
 668 my @lines = ();
 669 my @fixed = ();
 670 my @fixed_inserted = ();
 671 my @fixed_deleted = ();
 672 my $fixlinenr = -1;
 673
 674 my $vname;
 675 for my $filename (@ARGV) {
 676         my $FILE;
 677         if ($file) {
 678                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 679                         die "$P: $filename: diff failed - $!\n";
 680         } elsif ($filename eq '-') {
 681                 open($FILE, '<&STDIN');
 682         } else {
 683                 open($FILE, '<', "$filename") ||
 684                         die "$P: $filename: open failed - $!\n";
 685         }
 686         if ($filename eq '-') {
 687                 $vname = 'Your patch';
 688         } else {
 689                 $vname = $filename;
 690         }
 691         while (<$FILE>) {
 692                 chomp;
 693                 push(@rawlines, $_);
 694         }
 695         close($FILE);
 696         if (!process($filename)) {
 697                 $exit = 1;
 698         }
 699         @rawlines = ();
 700         @lines = ();
 701         @fixed = ();
 702         @fixed_inserted = ();
 703         @fixed_deleted = ();
 704         $fixlinenr = -1;
 705 }
 706
 707 exit($exit);
 708
 709 sub top_of_kernel_tree {
 710         my ($root) = @_;
 711
 712         my @tree_check = (
 713                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 714                 "README", "Documentation", "arch", "include", "drivers",
 715                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 716         );
 717
 718         foreach my $check (@tree_check) {
 719                 if (! -e $root . '/' . $check) {
 720                         return 0;
 721                 }
 722         }
 723         return 1;
 724 }
 725
 726 sub parse_email {
 727         my ($formatted_email) = @_;
 728
 729         my $name = "";
 730         my $address = "";
 731         my $comment = "";
 732
 733         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 734                 $name = $1;
 735                 $address = $2;
 736                 $comment = $3 if defined $3;
 737         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 738                 $address = $1;
 739                 $comment = $2 if defined $2;
 740         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 741                 $address = $1;
 742                 $comment = $2 if defined $2;
 743                 $formatted_email =~ s/$address.*$//;
 744                 $name = $formatted_email;
 745                 $name = trim($name);
 746                 $name =~ s/^\"|\"$//g;
 747                 # If there's a name left after stripping spaces and
 748                 # leading quotes, and the address doesn't have both
 749                 # leading and trailing angle brackets, the address
 750                 # is invalid. ie:
 751                 #   "joe smith joe@smith.com" bad
 752                 #   "joe smith <joe@smith.com" bad
 753                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
 754                         $name = "";
 755                         $address = "";
 756                         $comment = "";
 757                 }
 758         }
 759
 760         $name = trim($name);
 761         $name =~ s/^\"|\"$//g;
 762         $address = trim($address);
 763         $address =~ s/^\<|\>$//g;
 764
 765         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 766                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 767                 $name = "\"$name\"";
 768         }
 769
 770         return ($name, $address, $comment);
 771 }
 772
 773 sub format_email {
 774         my ($name, $address) = @_;
 775
 776         my $formatted_email;
 777
 778         $name = trim($name);
 779         $name =~ s/^\"|\"$//g;
 780         $address = trim($address);
 781
 782         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 783                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 784                 $name = "\"$name\"";
 785         }
 786
 787         if ("$name" eq "") {
 788                 $formatted_email = "$address";
 789         } else {
 790                 $formatted_email = "$name <$address>";
 791         }
 792
 793         return $formatted_email;
 794 }
 795
 796 sub which {
 797         my ($bin) = @_;
 798
 799         foreach my $path (split(/:/, $ENV{PATH})) {
 800                 if (-e "$path/$bin") {
 801                         return "$path/$bin";
 802                 }
 803         }
 804
 805         return "";
 806 }
 807
 808 sub which_conf {
 809         my ($conf) = @_;
 810
 811         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 812                 if (-e "$path/$conf") {
 813                         return "$path/$conf";
 814                 }
 815         }
 816
 817         return "";
 818 }
 819
 820 sub expand_tabs {
 821         my ($str) = @_;
 822
 823         my $res = '';
 824         my $n = 0;
 825         for my $c (split(//, $str)) {
 826                 if ($c eq "\t") {
 827                         $res .= ' ';
 828                         $n++;
 829                         for (; ($n % 8) != 0; $n++) {
 830                                 $res .= ' ';
 831                         }
 832                         next;
 833                 }
 834                 $res .= $c;
 835                 $n++;
 836         }
 837
 838         return $res;
 839 }
 840 sub copy_spacing {
 841         (my $res = shift) =~ tr/\t/ /c;
 842         return $res;
 843 }
 844
 845 sub line_stats {
 846         my ($line) = @_;
 847
 848         # Drop the diff line leader and expand tabs
 849         $line =~ s/^.//;
 850         $line = expand_tabs($line);
 851
 852         # Pick the indent from the front of the line.
 853         my ($white) = ($line =~ /^(\s*)/);
 854
 855         return (length($line), length($white));
 856 }
 857
 858 my $sanitise_quote = '';
 859
 860 sub sanitise_line_reset {
 861         my ($in_comment) = @_;
 862
 863         if ($in_comment) {
 864                 $sanitise_quote = '*/';
 865         } else {
 866                 $sanitise_quote = '';
 867         }
 868 }
 869 sub sanitise_line {
 870         my ($line) = @_;
 871
 872         my $res = '';
 873         my $l = '';
 874
 875         my $qlen = 0;
 876         my $off = 0;
 877         my $c;
 878
 879         # Always copy over the diff marker.
 880         $res = substr($line, 0, 1);
 881
 882         for ($off = 1; $off < length($line); $off++) {
 883                 $c = substr($line, $off, 1);
 884
 885                 # Comments we are wacking completly including the begin
 886                 # and end, all to $;.
 887                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 888                         $sanitise_quote = '*/';
 889
 890                         substr($res, $off, 2, "$;$;");
 891                         $off++;
 892                         next;
 893                 }
 894                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 895                         $sanitise_quote = '';
 896                         substr($res, $off, 2, "$;$;");
 897                         $off++;
 898                         next;
 899                 }
 900                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 901                         $sanitise_quote = '//';
 902
 903                         substr($res, $off, 2, $sanitise_quote);
 904                         $off++;
 905                         next;
 906                 }
 907
 908                 # A \ in a string means ignore the next character.
 909                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 910                     $c eq "\\") {
 911                         substr($res, $off, 2, 'XX');
 912                         $off++;
 913                         next;
 914                 }
 915                 # Regular quotes.
 916                 if ($c eq "'" || $c eq '"') {
 917                         if ($sanitise_quote eq '') {
 918                                 $sanitise_quote = $c;
 919
 920                                 substr($res, $off, 1, $c);
 921                                 next;
 922                         } elsif ($sanitise_quote eq $c) {
 923                                 $sanitise_quote = '';
 924                         }
 925                 }
 926
 927                 #print "c<$c> SQ<$sanitise_quote>\n";
 928                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 929                         substr($res, $off, 1, $;);
 930                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 931                         substr($res, $off, 1, $;);
 932                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 933                         substr($res, $off, 1, 'X');
 934                 } else {
 935                         substr($res, $off, 1, $c);
 936                 }
 937         }
 938
 939         if ($sanitise_quote eq '//') {
 940                 $sanitise_quote = '';
 941         }
 942
 943         # The pathname on a #include may be surrounded by '<' and '>'.
 944         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 945                 my $clean = 'X' x length($1);
 946                 $res =~ s@\<.*\>@<$clean>@;
 947
 948         # The whole of a #error is a string.
 949         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 950                 my $clean = 'X' x length($1);
 951                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 952         }
 953
 954         return $res;
 955 }
 956
 957 sub get_quoted_string {
 958         my ($line, $rawline) = @_;
 959
 960         return "" if ($line !~ m/(\"[X\t]+\")/g);
 961         return substr($rawline, $-[0], $+[0] - $-[0]);
 962 }
 963
 964 sub ctx_statement_block {
 965         my ($linenr, $remain, $off) = @_;
 966         my $line = $linenr - 1;
 967         my $blk = '';
 968         my $soff = $off;
 969         my $coff = $off - 1;
 970         my $coff_set = 0;
 971
 972         my $loff = 0;
 973
 974         my $type = '';
 975         my $level = 0;
 976         my @stack = ();
 977         my $p;
 978         my $c;
 979         my $len = 0;
 980
 981         my $remainder;
 982         while (1) {
 983                 @stack = (['', 0]) if ($#stack == -1);
 984
 985                 #warn "CSB: blk<$blk> remain<$remain>\n";
 986                 # If we are about to drop off the end, pull in more
 987                 # context.
 988                 if ($off >= $len) {
 989                         for (; $remain > 0; $line++) {
 990                                 last if (!defined $lines[$line]);
 991                                 next if ($lines[$line] =~ /^-/);
 992                                 $remain--;
 993                                 $loff = $len;
 994                                 $blk .= $lines[$line] . "\n";
 995                                 $len = length($blk);
 996                                 $line++;
 997                                 last;
 998                         }
 999                         # Bail if there is no further context.
1000                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
1001                         if ($off >= $len) {
1002                                 last;
1003                         }
1004                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
1005                                 $level++;
1006                                 $type = '#';
1007                         }
1008                 }
1009                 $p = $c;
1010                 $c = substr($blk, $off, 1);
1011                 $remainder = substr($blk, $off);
1012
1013                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
1014
1015                 # Handle nested #if/#else.
1016                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
1017                         push(@stack, [ $type, $level ]);
1018                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
1019                         ($type, $level) = @{$stack[$#stack - 1]};
1020                 } elsif ($remainder =~ /^#\s*endif\b/) {
1021                         ($type, $level) = @{pop(@stack)};
1022                 }
1023
1024                 # Statement ends at the ';' or a close '}' at the
1025                 # outermost level.
1026                 if ($level == 0 && $c eq ';') {
1027                         last;
1028                 }
1029
1030                 # An else is really a conditional as long as its not else if
1031                 if ($level == 0 && $coff_set == 0 &&
1032                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
1033                                 $remainder =~ /^(else)(?:\s|{)/ &&
1034                                 $remainder !~ /^else\s+if\b/) {
1035                         $coff = $off + length($1) - 1;
1036                         $coff_set = 1;
1037                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
1038                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
1039                 }
1040
1041                 if (($type eq '' || $type eq '(') && $c eq '(') {
1042                         $level++;
1043                         $type = '(';
1044                 }
1045                 if ($type eq '(' && $c eq ')') {
1046                         $level--;
1047                         $type = ($level != 0)? '(' : '';
1048
1049                         if ($level == 0 && $coff < $soff) {
1050                                 $coff = $off;
1051                                 $coff_set = 1;
1052                                 #warn "CSB: mark coff<$coff>\n";
1053                         }
1054                 }
1055                 if (($type eq '' || $type eq '{') && $c eq '{') {
1056                         $level++;
1057                         $type = '{';
1058                 }
1059                 if ($type eq '{' && $c eq '}') {
1060                         $level--;
1061                         $type = ($level != 0)? '{' : '';
1062
1063                         if ($level == 0) {
1064                                 if (substr($blk, $off + 1, 1) eq ';') {
1065                                         $off++;
1066                                 }
1067                                 last;
1068                         }
1069                 }
1070                 # Preprocessor commands end at the newline unless escaped.
1071                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
1072                         $level--;
1073                         $type = '';
1074                         $off++;
1075                         last;
1076                 }
1077                 $off++;
1078         }
1079         # We are truly at the end, so shuffle to the next line.
1080         if ($off == $len) {
1081                 $loff = $len + 1;
1082                 $line++;
1083                 $remain--;
1084         }
1085
1086         my $statement = substr($blk, $soff, $off - $soff + 1);
1087         my $condition = substr($blk, $soff, $coff - $soff + 1);
1088
1089         #warn "STATEMENT<$statement>\n";
1090         #warn "CONDITION<$condition>\n";
1091
1092         #print "coff<$coff> soff<$off> loff<$loff>\n";
1093
1094         return ($statement, $condition,
1095                         $line, $remain + 1, $off - $loff + 1, $level);
1096 }
1097
1098 sub statement_lines {
1099         my ($stmt) = @_;
1100
1101         # Strip the diff line prefixes and rip blank lines at start and end.
1102         $stmt =~ s/(^|\n)./$1/g;
1103         $stmt =~ s/^\s*//;
1104         $stmt =~ s/\s*$//;
1105
1106         my @stmt_lines = ($stmt =~ /\n/g);
1107
1108         return $#stmt_lines + 2;
1109 }
1110
1111 sub statement_rawlines {
1112         my ($stmt) = @_;
1113
1114         my @stmt_lines = ($stmt =~ /\n/g);
1115
1116         return $#stmt_lines + 2;
1117 }
1118
1119 sub statement_block_size {
1120         my ($stmt) = @_;
1121
1122         $stmt =~ s/(^|\n)./$1/g;
1123         $stmt =~ s/^\s*{//;
1124         $stmt =~ s/}\s*$//;
1125         $stmt =~ s/^\s*//;
1126         $stmt =~ s/\s*$//;
1127
1128         my @stmt_lines = ($stmt =~ /\n/g);
1129         my @stmt_statements = ($stmt =~ /;/g);
1130
1131         my $stmt_lines = $#stmt_lines + 2;
1132         my $stmt_statements = $#stmt_statements + 1;
1133
1134         if ($stmt_lines > $stmt_statements) {
1135                 return $stmt_lines;
1136         } else {
1137                 return $stmt_statements;
1138         }
1139 }
1140
1141 sub ctx_statement_full {
1142         my ($linenr, $remain, $off) = @_;
1143         my ($statement, $condition, $level);
1144
1145         my (@chunks);
1146
1147         # Grab the first conditional/block pair.
1148         ($statement, $condition, $linenr, $remain, $off, $level) =
1149                                 ctx_statement_block($linenr, $remain, $off);
1150         #print "F: c<$condition> s<$statement> remain<$remain>\n";
1151         push(@chunks, [ $condition, $statement ]);
1152         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
1153                 return ($level, $linenr, @chunks);
1154         }
1155
1156         # Pull in the following conditional/block pairs and see if they
1157         # could continue the statement.
1158         for (;;) {
1159                 ($statement, $condition, $linenr, $remain, $off, $level) =
1160                                 ctx_statement_block($linenr, $remain, $off);
1161                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
1162                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
1163                 #print "C: push\n";
1164                 push(@chunks, [ $condition, $statement ]);
1165         }
1166
1167         return ($level, $linenr, @chunks);
1168 }
1169
1170 sub ctx_block_get {
1171         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
1172         my $line;
1173         my $start = $linenr - 1;
1174         my $blk = '';
1175         my @o;
1176         my @c;
1177         my @res = ();
1178
1179         my $level = 0;
1180         my @stack = ($level);
1181         for ($line = $start; $remain > 0; $line++) {
1182                 next if ($rawlines[$line] =~ /^-/);
1183                 $remain--;
1184
1185                 $blk .= $rawlines[$line];
1186
1187                 # Handle nested #if/#else.
1188                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
1189                         push(@stack, $level);
1190                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
1191                         $level = $stack[$#stack - 1];
1192                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
1193                         $level = pop(@stack);
1194                 }
1195
1196                 foreach my $c (split(//, $lines[$line])) {
1197                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
1198                         if ($off > 0) {
1199                                 $off--;
1200                                 next;
1201                         }
1202
1203                         if ($c eq $close && $level > 0) {
1204                                 $level--;
1205                                 last if ($level == 0);
1206                         } elsif ($c eq $open) {
1207                                 $level++;
1208                         }
1209                 }
1210
1211                 if (!$outer || $level <= 1) {
1212                         push(@res, $rawlines[$line]);
1213                 }
1214
1215                 last if ($level == 0);
1216         }
1217
1218         return ($level, @res);
1219 }
1220 sub ctx_block_outer {
1221         my ($linenr, $remain) = @_;
1222
1223         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
1224         return @r;
1225 }
1226 sub ctx_block {
1227         my ($linenr, $remain) = @_;
1228
1229         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1230         return @r;
1231 }
1232 sub ctx_statement {
1233         my ($linenr, $remain, $off) = @_;
1234
1235         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1236         return @r;
1237 }
1238 sub ctx_block_level {
1239         my ($linenr, $remain) = @_;
1240
1241         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1242 }
1243 sub ctx_statement_level {
1244         my ($linenr, $remain, $off) = @_;
1245
1246         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1247 }
1248
1249 sub ctx_locate_comment {
1250         my ($first_line, $end_line) = @_;
1251
1252         # Catch a comment on the end of the line itself.
1253         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
1254         return $current_comment if (defined $current_comment);
1255
1256         # Look through the context and try and figure out if there is a
1257         # comment.
1258         my $in_comment = 0;
1259         $current_comment = '';
1260         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
1261                 my $line = $rawlines[$linenr - 1];
1262                 #warn "           $line\n";
1263                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
1264                         $in_comment = 1;
1265                 }
1266                 if ($line =~ m@/\*@) {
1267                         $in_comment = 1;
1268                 }
1269                 if (!$in_comment && $current_comment ne '') {
1270                         $current_comment = '';
1271                 }
1272                 $current_comment .= $line . "\n" if ($in_comment);
1273                 if ($line =~ m@\*/@) {
1274                         $in_comment = 0;
1275                 }
1276         }
1277
1278         chomp($current_comment);
1279         return($current_comment);
1280 }
1281 sub ctx_has_comment {
1282         my ($first_line, $end_line) = @_;
1283         my $cmt = ctx_locate_comment($first_line, $end_line);
1284
1285         ##print "LINE: $rawlines[$end_line - 1 ]\n";
1286         ##print "CMMT: $cmt\n";
1287
1288         return ($cmt ne '');
1289 }
1290
1291 sub raw_line {
1292         my ($linenr, $cnt) = @_;
1293
1294         my $offset = $linenr - 1;
1295         $cnt++;
1296
1297         my $line;
1298         while ($cnt) {
1299                 $line = $rawlines[$offset++];
1300                 next if (defined($line) && $line =~ /^-/);
1301                 $cnt--;
1302         }
1303
1304         return $line;
1305 }
1306
1307 sub cat_vet {
1308         my ($vet) = @_;
1309         my ($res, $coded);
1310
1311         $res = '';
1312         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
1313                 $res .= $1;
1314                 if ($2 ne '') {
1315                         $coded = sprintf("^%c", unpack('C', $2) + 64);
1316                         $res .= $coded;
1317                 }
1318         }
1319         $res =~ s/$/\$/;
1320
1321         return $res;
1322 }
1323
1324 my $av_preprocessor = 0;
1325 my $av_pending;
1326 my @av_paren_type;
1327 my $av_pend_colon;
1328
1329 sub annotate_reset {
1330         $av_preprocessor = 0;
1331         $av_pending = '_';
1332         @av_paren_type = ('E');
1333         $av_pend_colon = 'O';
1334 }
1335
1336 sub annotate_values {
1337         my ($stream, $type) = @_;
1338
1339         my $res;
1340         my $var = '_' x length($stream);
1341         my $cur = $stream;
1342
1343         print "$stream\n" if ($dbg_values > 1);
1344
1345         while (length($cur)) {
1346                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1347                 print " <" . join('', @av_paren_type) .
1348                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1349                 if ($cur =~ /^(\s+)/o) {
1350                         print "WS($1)\n" if ($dbg_values > 1);
1351                         if ($1 =~ /\n/ && $av_preprocessor) {
1352                                 $type = pop(@av_paren_type);
1353                                 $av_preprocessor = 0;
1354                         }
1355
1356                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1357                         print "CAST($1)\n" if ($dbg_values > 1);
1358                         push(@av_paren_type, $type);
1359                         $type = 'c';
1360
1361                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1362                         print "DECLARE($1)\n" if ($dbg_values > 1);
1363                         $type = 'T';
1364
1365                 } elsif ($cur =~ /^($Modifier)\s*/) {
1366                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1367                         $type = 'T';
1368
1369                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1370                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1371                         $av_preprocessor = 1;
1372                         push(@av_paren_type, $type);
1373                         if ($2 ne '') {
1374                                 $av_pending = 'N';
1375                         }
1376                         $type = 'E';
1377
1378                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1379                         print "UNDEF($1)\n" if ($dbg_values > 1);
1380                         $av_preprocessor = 1;
1381                         push(@av_paren_type, $type);
1382
1383                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1384                         print "PRE_START($1)\n" if ($dbg_values > 1);
1385                         $av_preprocessor = 1;
1386
1387                         push(@av_paren_type, $type);
1388                         push(@av_paren_type, $type);
1389                         $type = 'E';
1390
1391                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1392                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1393                         $av_preprocessor = 1;
1394
1395                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1396
1397                         $type = 'E';
1398
1399                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1400                         print "PRE_END($1)\n" if ($dbg_values > 1);
1401
1402                         $av_preprocessor = 1;
1403
1404                         # Assume all arms of the conditional end as this
1405                         # one does, and continue as if the #endif was not here.
1406                         pop(@av_paren_type);
1407                         push(@av_paren_type, $type);
1408                         $type = 'E';
1409
1410                 } elsif ($cur =~ /^(\\\n)/o) {
1411                         print "PRECONT($1)\n" if ($dbg_values > 1);
1412
1413                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1414                         print "ATTR($1)\n" if ($dbg_values > 1);
1415                         $av_pending = $type;
1416                         $type = 'N';
1417
1418                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1419                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1420                         if (defined $2) {
1421                                 $av_pending = 'V';
1422                         }
1423                         $type = 'N';
1424
1425                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1426                         print "COND($1)\n" if ($dbg_values > 1);
1427                         $av_pending = 'E';
1428                         $type = 'N';
1429
1430                 } elsif ($cur =~/^(case)/o) {
1431                         print "CASE($1)\n" if ($dbg_values > 1);
1432                         $av_pend_colon = 'C';
1433                         $type = 'N';
1434
1435                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1436                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1437                         $type = 'N';
1438
1439                 } elsif ($cur =~ /^(\()/o) {
1440                         print "PAREN('$1')\n" if ($dbg_values > 1);
1441                         push(@av_paren_type, $av_pending);
1442                         $av_pending = '_';
1443                         $type = 'N';
1444
1445                 } elsif ($cur =~ /^(\))/o) {
1446                         my $new_type = pop(@av_paren_type);
1447                         if ($new_type ne '_') {
1448                                 $type = $new_type;
1449                                 print "PAREN('$1') -> $type\n"
1450                                                         if ($dbg_values > 1);
1451                         } else {
1452                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1453                         }
1454
1455                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1456                         print "FUNC($1)\n" if ($dbg_values > 1);
1457                         $type = 'V';
1458                         $av_pending = 'V';
1459
1460                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1461                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1462                                 $av_pend_colon = 'B';
1463                         } elsif ($type eq 'E') {
1464                                 $av_pend_colon = 'L';
1465                         }
1466                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1467                         $type = 'V';
1468
1469                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1470                         print "IDENT($1)\n" if ($dbg_values > 1);
1471                         $type = 'V';
1472
1473                 } elsif ($cur =~ /^($Assignment)/o) {
1474                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1475                         $type = 'N';
1476
1477                 } elsif ($cur =~/^(;|{|})/) {
1478                         print "END($1)\n" if ($dbg_values > 1);
1479                         $type = 'E';
1480                         $av_pend_colon = 'O';
1481
1482                 } elsif ($cur =~/^(,)/) {
1483                         print "COMMA($1)\n" if ($dbg_values > 1);
1484                         $type = 'C';
1485
1486                 } elsif ($cur =~ /^(\?)/o) {
1487                         print "QUESTION($1)\n" if ($dbg_values > 1);
1488                         $type = 'N';
1489
1490                 } elsif ($cur =~ /^(:)/o) {
1491                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1492
1493                         substr($var, length($res), 1, $av_pend_colon);
1494                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1495                                 $type = 'E';
1496                         } else {
1497                                 $type = 'N';
1498                         }
1499                         $av_pend_colon = 'O';
1500
1501                 } elsif ($cur =~ /^(\[)/o) {
1502                         print "CLOSE($1)\n" if ($dbg_values > 1);
1503                         $type = 'N';
1504
1505                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1506                         my $variant;
1507
1508                         print "OPV($1)\n" if ($dbg_values > 1);
1509                         if ($type eq 'V') {
1510                                 $variant = 'B';
1511                         } else {
1512                                 $variant = 'U';
1513                         }
1514
1515                         substr($var, length($res), 1, $variant);
1516                         $type = 'N';
1517
1518                 } elsif ($cur =~ /^($Operators)/o) {
1519                         print "OP($1)\n" if ($dbg_values > 1);
1520                         if ($1 ne '++' && $1 ne '--') {
1521                                 $type = 'N';
1522                         }
1523
1524                 } elsif ($cur =~ /(^.)/o) {
1525                         print "C($1)\n" if ($dbg_values > 1);
1526                 }
1527                 if (defined $1) {
1528                         $cur = substr($cur, length($1));
1529                         $res .= $type x length($1);
1530                 }
1531         }
1532
1533         return ($res, $var);
1534 }
1535
1536 sub possible {
1537         my ($possible, $line) = @_;
1538         my $notPermitted = qr{(?:
1539                 ^(?:
1540                         $Modifier|
1541                         $Storage|
1542                         $Type|
1543                         DEFINE_\S+
1544                 )$|
1545                 ^(?:
1546                         goto|
1547                         return|
1548                         case|
1549                         else|
1550                         asm|__asm__|
1551                         do|
1552                         \#|
1553                         \#\#|
1554                 )(?:\s|$)|
1555                 ^(?:typedef|struct|enum)\b
1556             )}x;
1557         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1558         if ($possible !~ $notPermitted) {
1559                 # Check for modifiers.
1560                 $possible =~ s/\s*$Storage\s*//g;
1561                 $possible =~ s/\s*$Sparse\s*//g;
1562                 if ($possible =~ /^\s*$/) {
1563
1564                 } elsif ($possible =~ /\s/) {
1565                         $possible =~ s/\s*$Type\s*//g;
1566                         for my $modifier (split(' ', $possible)) {
1567                                 if ($modifier !~ $notPermitted) {
1568                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1569                                         push(@modifierList, $modifier);
1570                                 }
1571                         }
1572
1573                 } else {
1574                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1575                         push(@typeList, $possible);
1576                 }
1577                 build_types();
1578         } else {
1579                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1580         }
1581 }
1582
1583 my $prefix = '';
1584
1585 sub show_type {
1586         my ($type) = @_;
1587
1588         return defined $use_type{$type} if (scalar keys %use_type > 0);
1589
1590         return !defined $ignore_type{$type};
1591 }
1592
1593 sub report {
1594         my ($level, $type, $msg) = @_;
1595
1596         if (!show_type($type) ||
1597             (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
1598                 return 0;
1599         }
1600         my $line;
1601         if ($show_types) {
1602                 $line = "$prefix$level:$type: $msg\n";
1603         } else {
1604                 $line = "$prefix$level: $msg\n";
1605         }
1606         $line = (split('\n', $line))[0] . "\n" if ($terse);
1607
1608         push(our @report, $line);
1609
1610         return 1;
1611 }
1612
1613 sub report_dump {
1614         our @report;
1615 }
1616
1617 sub fixup_current_range {
1618         my ($lineRef, $offset, $length) = @_;
1619
1620         if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
1621                 my $o = $1;
1622                 my $l = $2;
1623                 my $no = $o + $offset;
1624                 my $nl = $l + $length;
1625                 $$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
1626         }
1627 }
1628
1629 sub fix_inserted_deleted_lines {
1630         my ($linesRef, $insertedRef, $deletedRef) = @_;
1631
1632         my $range_last_linenr = 0;
1633         my $delta_offset = 0;
1634
1635         my $old_linenr = 0;
1636         my $new_linenr = 0;
1637
1638         my $next_insert = 0;
1639         my $next_delete = 0;
1640
1641         my @lines = ();
1642
1643         my $inserted = @{$insertedRef}[$next_insert++];
1644         my $deleted = @{$deletedRef}[$next_delete++];
1645
1646         foreach my $old_line (@{$linesRef}) {
1647                 my $save_line = 1;
1648                 my $line = $old_line;   #don't modify the array
1649                 if ($line =~ /^(?:\+\+\+\|\-\-\-)\s+\S+/) {     #new filename
1650                         $delta_offset = 0;
1651                 } elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {    #new hunk
1652                         $range_last_linenr = $new_linenr;
1653                         fixup_current_range(\$line, $delta_offset, 0);
1654                 }
1655
1656                 while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
1657                         $deleted = @{$deletedRef}[$next_delete++];
1658                         $save_line = 0;
1659                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
1660                 }
1661
1662                 while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
1663                         push(@lines, ${$inserted}{'LINE'});
1664                         $inserted = @{$insertedRef}[$next_insert++];
1665                         $new_linenr++;
1666                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
1667                 }
1668
1669                 if ($save_line) {
1670                         push(@lines, $line);
1671                         $new_linenr++;
1672                 }
1673
1674                 $old_linenr++;
1675         }
1676
1677         return @lines;
1678 }
1679
1680 sub fix_insert_line {
1681         my ($linenr, $line) = @_;
1682
1683         my $inserted = {
1684                 LINENR => $linenr,
1685                 LINE => $line,
1686         };
1687         push(@fixed_inserted, $inserted);
1688 }
1689
1690 sub fix_delete_line {
1691         my ($linenr, $line) = @_;
1692
1693         my $deleted = {
1694                 LINENR => $linenr,
1695                 LINE => $line,
1696         };
1697
1698         push(@fixed_deleted, $deleted);
1699 }
1700
1701 sub ERROR {
1702         my ($type, $msg) = @_;
1703
1704         if (report("ERROR", $type, $msg)) {
1705                 our $clean = 0;
1706                 our $cnt_error++;
1707                 return 1;
1708         }
1709         return 0;
1710 }
1711 sub WARN {
1712         my ($type, $msg) = @_;
1713
1714         if (report("WARNING", $type, $msg)) {
1715                 our $clean = 0;
1716                 our $cnt_warn++;
1717                 return 1;
1718         }
1719         return 0;
1720 }
1721 sub CHK {
1722         my ($type, $msg) = @_;
1723
1724         if ($check && report("CHECK", $type, $msg)) {
1725                 our $clean = 0;
1726                 our $cnt_chk++;
1727                 return 1;
1728         }
1729         return 0;
1730 }
1731
1732 sub check_absolute_file {
1733         my ($absolute, $herecurr) = @_;
1734         my $file = $absolute;
1735
1736         ##print "absolute<$absolute>\n";
1737
1738         # See if any suffix of this path is a path within the tree.
1739         while ($file =~ s@^[^/]*/@@) {
1740                 if (-f "$root/$file") {
1741                         ##print "file<$file>\n";
1742                         last;
1743                 }
1744         }
1745         if (! -f _)  {
1746                 return 0;
1747         }
1748
1749         # It is, so see if the prefix is acceptable.
1750         my $prefix = $absolute;
1751         substr($prefix, -length($file)) = '';
1752
1753         ##print "prefix<$prefix>\n";
1754         if ($prefix ne ".../") {
1755                 WARN("USE_RELATIVE_PATH",
1756                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1757         }
1758 }
1759
1760 sub trim {
1761         my ($string) = @_;
1762
1763         $string =~ s/^\s+|\s+$//g;
1764
1765         return $string;
1766 }
1767
1768 sub ltrim {
1769         my ($string) = @_;
1770
1771         $string =~ s/^\s+//;
1772
1773         return $string;
1774 }
1775
1776 sub rtrim {
1777         my ($string) = @_;
1778
1779         $string =~ s/\s+$//;
1780
1781         return $string;
1782 }
1783
1784 sub string_find_replace {
1785         my ($string, $find, $replace) = @_;
1786
1787         $string =~ s/$find/$replace/g;
1788
1789         return $string;
1790 }
1791
1792 sub tabify {
1793         my ($leading) = @_;
1794
1795         my $source_indent = 8;
1796         my $max_spaces_before_tab = $source_indent - 1;
1797         my $spaces_to_tab = " " x $source_indent;
1798
1799         #convert leading spaces to tabs
1800         1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
1801         #Remove spaces before a tab
1802         1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;
1803
1804         return "$leading";
1805 }
1806
1807 sub pos_last_openparen {
1808         my ($line) = @_;
1809
1810         my $pos = 0;
1811
1812         my $opens = $line =~ tr/\(/\(/;
1813         my $closes = $line =~ tr/\)/\)/;
1814
1815         my $last_openparen = 0;
1816
1817         if (($opens == 0) || ($closes >= $opens)) {
1818                 return -1;
1819         }
1820
1821         my $len = length($line);
1822
1823         for ($pos = 0; $pos < $len; $pos++) {
1824                 my $string = substr($line, $pos);
1825                 if ($string =~ /^($FuncArg|$balanced_parens)/) {
1826                         $pos += length($1) - 1;
1827                 } elsif (substr($line, $pos, 1) eq '(') {
1828                         $last_openparen = $pos;
1829                 } elsif (index($string, '(') == -1) {
1830                         last;
1831                 }
1832         }
1833
1834         return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
1835 }
1836
1837 sub process {
1838         my $filename = shift;
1839
1840         my $linenr=0;
1841         my $prevline="";
1842         my $prevrawline="";
1843         my $stashline="";
1844         my $stashrawline="";
1845
1846         my $length;
1847         my $indent;
1848         my $previndent=0;
1849         my $stashindent=0;
1850
1851         our $clean = 1;
1852         my $signoff = 0;
1853         my $is_patch = 0;
1854
1855         my $in_header_lines = $file ? 0 : 1;
1856         my $in_commit_log = 0;          #Scanning lines before patch
1857         my $reported_maintainer_file = 0;
1858         my $non_utf8_charset = 0;
1859
1860         my $last_blank_line = 0;
1861         my $last_coalesced_string_linenr = -1;
1862
1863         our @report = ();
1864         our $cnt_lines = 0;
1865         our $cnt_error = 0;
1866         our $cnt_warn = 0;
1867         our $cnt_chk = 0;
1868
1869         # Trace the real file/line as we go.
1870         my $realfile = '';
1871         my $realline = 0;
1872         my $realcnt = 0;
1873         my $here = '';
1874         my $in_comment = 0;
1875         my $comment_edge = 0;
1876         my $first_line = 0;
1877         my $p1_prefix = '';
1878
1879         my $prev_values = 'E';
1880
1881         # suppression flags
1882         my %suppress_ifbraces;
1883         my %suppress_whiletrailers;
1884         my %suppress_export;
1885         my $suppress_statement = 0;
1886
1887         my %signatures = ();
1888
1889         # Pre-scan the patch sanitizing the lines.
1890         # Pre-scan the patch looking for any __setup documentation.
1891         #
1892         my @setup_docs = ();
1893         my $setup_docs = 0;
1894
1895         my $camelcase_file_seeded = 0;
1896
1897         sanitise_line_reset();
1898         my $line;
1899         foreach my $rawline (@rawlines) {
1900                 $linenr++;
1901                 $line = $rawline;
1902
1903                 push(@fixed, $rawline) if ($fix);
1904
1905                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1906                         $setup_docs = 0;
1907                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1908                                 $setup_docs = 1;
1909                         }
1910                         #next;
1911                 }
1912                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1913                         $realline=$1-1;
1914                         if (defined $2) {
1915                                 $realcnt=$3+1;
1916                         } else {
1917                                 $realcnt=1+1;
1918                         }
1919                         $in_comment = 0;
1920
1921                         # Guestimate if this is a continuing comment.  Run
1922                         # the context looking for a comment "edge".  If this
1923                         # edge is a close comment then we must be in a comment
1924                         # at context start.
1925                         my $edge;
1926                         my $cnt = $realcnt;
1927                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1928                                 next if (defined $rawlines[$ln - 1] &&
1929                                          $rawlines[$ln - 1] =~ /^-/);
1930                                 $cnt--;
1931                                 #print "RAW<$rawlines[$ln - 1]>\n";
1932                                 last if (!defined $rawlines[$ln - 1]);
1933                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1934                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1935                                         ($edge) = $1;
1936                                         last;
1937                                 }
1938                         }
1939                         if (defined $edge && $edge eq '*/') {
1940                                 $in_comment = 1;
1941                         }
1942
1943                         # Guestimate if this is a continuing comment.  If this
1944                         # is the start of a diff block and this line starts
1945                         # ' *' then it is very likely a comment.
1946                         if (!defined $edge &&
1947                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1948                         {
1949                                 $in_comment = 1;
1950                         }
1951
1952                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1953                         sanitise_line_reset($in_comment);
1954
1955                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1956                         # Standardise the strings and chars within the input to
1957                         # simplify matching -- only bother with positive lines.
1958                         $line = sanitise_line($rawline);
1959                 }
1960                 push(@lines, $line);
1961
1962                 if ($realcnt > 1) {
1963                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1964                 } else {
1965                         $realcnt = 0;
1966                 }
1967
1968                 #print "==>$rawline\n";
1969                 #print "-->$line\n";
1970
1971                 if ($setup_docs && $line =~ /^\+/) {
1972                         push(@setup_docs, $line);
1973                 }
1974         }
1975
1976         $prefix = '';
1977
1978         $realcnt = 0;
1979         $linenr = 0;
1980         $fixlinenr = -1;
1981         foreach my $line (@lines) {
1982                 $linenr++;
1983                 $fixlinenr++;
1984                 my $sline = $line;      #copy of $line
1985                 $sline =~ s/$;/ /g;     #with comments as spaces
1986
1987                 my $rawline = $rawlines[$linenr - 1];
1988
1989 #extract the line range in the file after the patch is applied
1990                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1991                         $is_patch = 1;
1992                         $first_line = $linenr + 1;
1993                         $realline=$1-1;
1994                         if (defined $2) {
1995                                 $realcnt=$3+1;
1996                         } else {
1997                                 $realcnt=1+1;
1998                         }
1999                         annotate_reset();
2000                         $prev_values = 'E';
2001
2002                         %suppress_ifbraces = ();
2003                         %suppress_whiletrailers = ();
2004                         %suppress_export = ();
2005                         $suppress_statement = 0;
2006                         next;
2007
2008 # track the line number as we move through the hunk, note that
2009 # new versions of GNU diff omit the leading space on completely
2010 # blank context lines so we need to count that too.
2011                 } elsif ($line =~ /^( |\+|$)/) {
2012                         $realline++;
2013                         $realcnt-- if ($realcnt != 0);
2014
2015                         # Measure the line length and indent.
2016                         ($length, $indent) = line_stats($rawline);
2017
2018                         # Track the previous line.
2019                         ($prevline, $stashline) = ($stashline, $line);
2020                         ($previndent, $stashindent) = ($stashindent, $indent);
2021                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
2022
2023                         #warn "line<$line>\n";
2024
2025                 } elsif ($realcnt == 1) {
2026                         $realcnt--;
2027                 }
2028
2029                 my $hunk_line = ($realcnt != 0);
2030
2031 #make up the handle for any error we report on this line
2032                 $prefix = "$filename:$realline: " if ($emacs && $file);
2033                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
2034
2035                 $here = "#$linenr: " if (!$file);
2036                 $here = "#$realline: " if ($file);
2037
2038                 my $found_file = 0;
2039                 # extract the filename as it passes
2040                 if ($line =~ /^diff --git.*?(\S+)$/) {
2041                         $realfile = $1;
2042                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2043                         $in_commit_log = 0;
2044                         $found_file = 1;
2045                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
2046                         $realfile = $1;
2047                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2048                         $in_commit_log = 0;
2049
2050                         $p1_prefix = $1;
2051                         if (!$file && $tree && $p1_prefix ne '' &&
2052                             -e "$root/$p1_prefix") {
2053                                 WARN("PATCH_PREFIX",
2054                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
2055                         }
2056
2057                         if ($realfile =~ m@^include/asm/@) {
2058                                 ERROR("MODIFIED_INCLUDE_ASM",
2059                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
2060                         }
2061                         $found_file = 1;
2062                 }
2063
2064                 if ($found_file) {
2065                         if ($realfile =~ m@^(drivers/net/|net/)@) {
2066                                 $check = 1;
2067                         } else {
2068                                 $check = $check_orig;
2069                         }
2070                         next;
2071                 }
2072
2073                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
2074
2075                 my $hereline = "$here\n$rawline\n";
2076                 my $herecurr = "$here\n$rawline\n";
2077                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
2078
2079                 $cnt_lines++ if ($realcnt != 0);
2080
2081 # Check for incorrect file permissions
2082                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
2083                         my $permhere = $here . "FILE: $realfile\n";
2084                         if ($realfile !~ m@scripts/@ &&
2085                             $realfile !~ /\.(py|pl|awk|sh)$/) {
2086                                 ERROR("EXECUTE_PERMISSIONS",
2087                                       "do not set execute permissions for source files\n" . $permhere);
2088                         }
2089                 }
2090
2091 # Check the patch for a signoff:
2092                 if ($line =~ /^\s*signed-off-by:/i) {
2093                         $signoff++;
2094                         $in_commit_log = 0;
2095                 }
2096
2097 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
2098 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
2099                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
2100                         $reported_maintainer_file = 1;
2101                 }
2102
2103 # Check signature styles
2104                 if (!$in_header_lines &&
2105                     $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
2106                         my $space_before = $1;
2107                         my $sign_off = $2;
2108                         my $space_after = $3;
2109                         my $email = $4;
2110                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
2111
2112                         if ($sign_off !~ /$signature_tags/) {
2113                                 WARN("BAD_SIGN_OFF",
2114                                      "Non-standard signature: $sign_off\n" . $herecurr);
2115                         }
2116                         if (defined $space_before && $space_before ne "") {
2117                                 if (WARN("BAD_SIGN_OFF",
2118                                          "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
2119                                     $fix) {
2120                                         $fixed[$fixlinenr] =
2121                                             "$ucfirst_sign_off $email";
2122                                 }
2123                         }
2124                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
2125                                 if (WARN("BAD_SIGN_OFF",
2126                                          "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
2127                                     $fix) {
2128                                         $fixed[$fixlinenr] =
2129                                             "$ucfirst_sign_off $email";
2130                                 }
2131
2132                         }
2133                         if (!defined $space_after || $space_after ne " ") {
2134                                 if (WARN("BAD_SIGN_OFF",
2135                                          "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
2136                                     $fix) {
2137                                         $fixed[$fixlinenr] =
2138                                             "$ucfirst_sign_off $email";
2139                                 }
2140                         }
2141
2142                         my ($email_name, $email_address, $comment) = parse_email($email);
2143                         my $suggested_email = format_email(($email_name, $email_address));
2144                         if ($suggested_email eq "") {
2145                                 ERROR("BAD_SIGN_OFF",
2146                                       "Unrecognized email address: '$email'\n" . $herecurr);
2147                         } else {
2148                                 my $dequoted = $suggested_email;
2149                                 $dequoted =~ s/^"//;
2150                                 $dequoted =~ s/" </ </;
2151                                 # Don't force email to have quotes
2152                                 # Allow just an angle bracketed address
2153                                 if ("$dequoted$comment" ne $email &&
2154                                     "<$email_address>$comment" ne $email &&
2155                                     "$suggested_email$comment" ne $email) {
2156                                         WARN("BAD_SIGN_OFF",
2157                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
2158                                 }
2159                         }
2160
2161 # Check for duplicate signatures
2162                         my $sig_nospace = $line;
2163                         $sig_nospace =~ s/\s//g;
2164                         $sig_nospace = lc($sig_nospace);
2165                         if (defined $signatures{$sig_nospace}) {
2166                                 WARN("BAD_SIGN_OFF",
2167                                      "Duplicate signature\n" . $herecurr);
2168                         } else {
2169                                 $signatures{$sig_nospace} = 1;
2170                         }
2171                 }
2172
2173 # Check for old stable address
2174                 if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) {
2175                         ERROR("STABLE_ADDRESS",
2176                               "The 'stable' address should be 'stable\@vger.kernel.org'\n" . $herecurr);
2177                 }
2178
2179 # Check for unwanted Gerrit info
2180                 if ($in_commit_log && $line =~ /^\s*change-id:/i) {
2181                         ERROR("GERRIT_CHANGE_ID",
2182                               "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr);
2183                 }
2184
2185 # Check for git id commit length and improperly formed commit descriptions
2186                 if ($in_commit_log && $line =~ /\b(c)ommit\s+([0-9a-f]{5,})/i) {
2187                         my $init_char = $1;
2188                         my $orig_commit = lc($2);
2189                         my $short = 1;
2190                         my $long = 0;
2191                         my $case = 1;
2192                         my $space = 1;
2193                         my $hasdesc = 0;
2194                         my $id = '0123456789ab';
2195                         my $orig_desc = "commit description";
2196                         my $description = "";
2197
2198                         $short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
2199                         $long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
2200                         $space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
2201                         $case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
2202                         if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
2203                                 $orig_desc = $1;
2204                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
2205                                  defined $rawlines[$linenr] &&
2206                                  $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
2207                                 $orig_desc = $1;
2208                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
2209                                  defined $rawlines[$linenr] &&
2210                                  $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
2211                                 $line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
2212                                 $orig_desc = $1;
2213                                 $rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
2214                                 $orig_desc .= " " . $1;
2215                         }
2216
2217                         ($id, $description) = git_commit_info($orig_commit,
2218                                                               $id, $orig_desc);
2219
2220                         if ($short || $long || $space || $case || ($orig_desc ne $description)) {
2221                                 ERROR("GIT_COMMIT_ID",
2222                                       "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr);
2223                         }
2224                 }
2225
2226 # Check for added, moved or deleted files
2227                 if (!$reported_maintainer_file && !$in_commit_log &&
2228                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
2229                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
2230                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
2231                       (defined($1) || defined($2))))) {
2232                         $reported_maintainer_file = 1;
2233                         WARN("FILE_PATH_CHANGES",
2234                              "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
2235                 }
2236
2237 # Check for wrappage within a valid hunk of the file
2238                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
2239                         ERROR("CORRUPTED_PATCH",
2240                               "patch seems to be corrupt (line wrapped?)\n" .
2241                                 $herecurr) if (!$emitted_corrupt++);
2242                 }
2243
2244 # Check for absolute kernel paths.
2245                 if ($tree) {
2246                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
2247                                 my $file = $1;
2248
2249                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
2250                                     check_absolute_file($1, $herecurr)) {
2251                                         #
2252                                 } else {
2253                                         check_absolute_file($file, $herecurr);
2254                                 }
2255                         }
2256                 }
2257
2258 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
2259                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
2260                     $rawline !~ m/^$UTF8*$/) {
2261                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
2262
2263                         my $blank = copy_spacing($rawline);
2264                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
2265                         my $hereptr = "$hereline$ptr\n";
2266
2267                         CHK("INVALID_UTF8",
2268                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
2269                 }
2270
2271 # Check if it's the start of a commit log
2272 # (not a header line and we haven't seen the patch filename)
2273                 if ($in_header_lines && $realfile =~ /^$/ &&
2274                     !($rawline =~ /^\s+\S/ ||
2275                       $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
2276                         $in_header_lines = 0;
2277                         $in_commit_log = 1;
2278                 }
2279
2280 # Check if there is UTF-8 in a commit log when a mail header has explicitly
2281 # declined it, i.e defined some charset where it is missing.
2282                 if ($in_header_lines &&
2283                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
2284                     $1 !~ /utf-8/i) {
2285                         $non_utf8_charset = 1;
2286                 }
2287
2288                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
2289                     $rawline =~ /$NON_ASCII_UTF8/) {
2290                         WARN("UTF8_BEFORE_PATCH",
2291                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
2292                 }
2293
2294 # Check for various typo / spelling mistakes
2295                 if (defined($misspellings) && ($in_commit_log || $line =~ /^\+/)) {
2296                         while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:$|[^a-z@])/gi) {
2297                                 my $typo = $1;
2298                                 my $typo_fix = $spelling_fix{lc($typo)};
2299                                 $typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
2300                                 $typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
2301                                 my $msg_type = \&WARN;
2302                                 $msg_type = \&CHK if ($file);
2303                                 if (&{$msg_type}("TYPO_SPELLING",
2304                                                  "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $herecurr) &&
2305                                     $fix) {
2306                                         $fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
2307                                 }
2308                         }
2309                 }
2310
2311 # ignore non-hunk lines and lines being removed
2312                 next if (!$hunk_line || $line =~ /^-/);
2313
2314 #trailing whitespace
2315                 if ($line =~ /^\+.*\015/) {
2316                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2317                         if (ERROR("DOS_LINE_ENDINGS",
2318                                   "DOS line endings\n" . $herevet) &&
2319                             $fix) {
2320                                 $fixed[$fixlinenr] =~ s/[\s\015]+$//;
2321                         }
2322                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
2323                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2324                         if (ERROR("TRAILING_WHITESPACE",
2325                                   "trailing whitespace\n" . $herevet) &&
2326                             $fix) {
2327                                 $fixed[$fixlinenr] =~ s/\s+$//;
2328                         }
2329
2330                         $rpt_cleaners = 1;
2331                 }
2332
2333 # Check for FSF mailing addresses.
2334                 if ($rawline =~ /\bwrite to the Free/i ||
2335                     $rawline =~ /\b59\s+Temple\s+Pl/i ||
2336                     $rawline =~ /\b51\s+Franklin\s+St/i) {
2337                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2338                         my $msg_type = \&ERROR;
2339                         $msg_type = \&CHK if ($file);
2340                         &{$msg_type}("FSF_MAILING_ADDRESS",
2341                                      "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.\n" . $herevet)
2342                 }
2343
2344 # check for Kconfig help text having a real description
2345 # Only applies when adding the entry originally, after that we do not have
2346 # sufficient context to determine whether it is indeed long enough.
2347                 if ($realfile =~ /Kconfig/ &&
2348                     $line =~ /^\+\s*config\s+/) {
2349                         my $length = 0;
2350                         my $cnt = $realcnt;
2351                         my $ln = $linenr + 1;
2352                         my $f;
2353                         my $is_start = 0;
2354                         my $is_end = 0;
2355                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
2356                                 $f = $lines[$ln - 1];
2357                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2358                                 $is_end = $lines[$ln - 1] =~ /^\+/;
2359
2360                                 next if ($f =~ /^-/);
2361                                 last if (!$file && $f =~ /^\@\@/);
2362
2363                                 if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate)\s*\"/) {
2364                                         $is_start = 1;
2365                                 } elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
2366                                         $length = -1;
2367                                 }
2368
2369                                 $f =~ s/^.//;
2370                                 $f =~ s/#.*//;
2371                                 $f =~ s/^\s+//;
2372                                 next if ($f =~ /^$/);
2373                                 if ($f =~ /^\s*config\s/) {
2374                                         $is_end = 1;
2375                                         last;
2376                                 }
2377                                 $length++;
2378                         }
2379                         if ($is_start && $is_end && $length < $min_conf_desc_length) {
2380                                 WARN("CONFIG_DESCRIPTION",
2381                                      "please write a paragraph that describes the config symbol fully\n" . $herecurr);
2382                         }
2383                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
2384                 }
2385
2386 # discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
2387                 if ($realfile =~ /Kconfig/ &&
2388                     $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
2389                         WARN("CONFIG_EXPERIMENTAL",
2390                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
2391                 }
2392
2393 # discourage the use of boolean for type definition attributes of Kconfig options
2394                 if ($realfile =~ /Kconfig/ &&
2395                     $line =~ /^\+\s*\bboolean\b/) {
2396                         WARN("CONFIG_TYPE_BOOLEAN",
2397                              "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
2398                 }
2399
2400                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
2401                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
2402                         my $flag = $1;
2403                         my $replacement = {
2404                                 'EXTRA_AFLAGS' =>   'asflags-y',
2405                                 'EXTRA_CFLAGS' =>   'ccflags-y',
2406                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
2407                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
2408                         };
2409
2410                         WARN("DEPRECATED_VARIABLE",
2411                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
2412                 }
2413
2414 # check for DT compatible documentation
2415                 if (defined $root &&
2416                         (($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
2417                          ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {
2418
2419                         my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
2420
2421                         my $dt_path = $root . "/Documentation/devicetree/bindings/";
2422                         my $vp_file = $dt_path . "vendor-prefixes.txt";
2423
2424                         foreach my $compat (@compats) {
2425                                 my $compat2 = $compat;
2426                                 $compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
2427                                 my $compat3 = $compat;
2428                                 $compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
2429                                 `grep -Erq "$compat|$compat2|$compat3" $dt_path`;
2430                                 if ( $? >> 8 ) {
2431                                         WARN("UNDOCUMENTED_DT_STRING",
2432                                              "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
2433                                 }
2434
2435                                 next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
2436                                 my $vendor = $1;
2437                                 `grep -Eq "^$vendor\\b" $vp_file`;
2438                                 if ( $? >> 8 ) {
2439                                         WARN("UNDOCUMENTED_DT_STRING",
2440                                              "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
2441                                 }
2442                         }
2443                 }
2444
2445 # check we are in a valid source file if not then ignore this hunk
2446                 next if ($realfile !~ /\.(h|c|s|S|pl|sh|dtsi|dts)$/);
2447
2448 #line length limit
2449                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
2450                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
2451                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
2452                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
2453                     $length > $max_line_length)
2454                 {
2455                         WARN("LONG_LINE",
2456                              "line over $max_line_length characters\n" . $herecurr);
2457                 }
2458
2459 # check for adding lines without a newline.
2460                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
2461                         WARN("MISSING_EOF_NEWLINE",
2462                              "adding a line without newline at end of file\n" . $herecurr);
2463                 }
2464
2465 # Blackfin: use hi/lo macros
2466                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
2467                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
2468                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
2469                                 ERROR("LO_MACRO",
2470                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
2471                         }
2472                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
2473                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
2474                                 ERROR("HI_MACRO",
2475                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
2476                         }
2477                 }
2478
2479 # check we are in a valid source file C or perl if not then ignore this hunk
2480                 next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
2481
2482 # at the beginning of a line any tabs must come first and anything
2483 # more than 8 must use tabs.
2484                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
2485                     $rawline =~ /^\+\s*        \s*/) {
2486                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2487                         $rpt_cleaners = 1;
2488                         if (ERROR("CODE_INDENT",
2489                                   "code indent should use tabs where possible\n" . $herevet) &&
2490                             $fix) {
2491                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
2492                         }
2493                 }
2494
2495 # check for space before tabs.
2496                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
2497                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2498                         if (WARN("SPACE_BEFORE_TAB",
2499                                 "please, no space before tabs\n" . $herevet) &&
2500                             $fix) {
2501                                 while ($fixed[$fixlinenr] =~
2502                                            s/(^\+.*) {8,8}\t/$1\t\t/) {}
2503                                 while ($fixed[$fixlinenr] =~
2504                                            s/(^\+.*) +\t/$1\t/) {}
2505                         }
2506                 }
2507
2508 # check for && or || at the start of a line
2509                 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
2510                         CHK("LOGICAL_CONTINUATIONS",
2511                             "Logical continuations should be on the previous line\n" . $hereprev);
2512                 }
2513
2514 # check multi-line statement indentation matches previous line
2515                 if ($^V && $^V ge 5.10.0 &&
2516                     $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|$Ident\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
2517                         $prevline =~ /^\+(\t*)(.*)$/;
2518                         my $oldindent = $1;
2519                         my $rest = $2;
2520
2521                         my $pos = pos_last_openparen($rest);
2522                         if ($pos >= 0) {
2523                                 $line =~ /^(\+| )([ \t]*)/;
2524                                 my $newindent = $2;
2525
2526                                 my $goodtabindent = $oldindent .
2527                                         "\t" x ($pos / 8) .
2528                                         " "  x ($pos % 8);
2529                                 my $goodspaceindent = $oldindent . " "  x $pos;
2530
2531                                 if ($newindent ne $goodtabindent &&
2532                                     $newindent ne $goodspaceindent) {
2533
2534                                         if (CHK("PARENTHESIS_ALIGNMENT",
2535                                                 "Alignment should match open parenthesis\n" . $hereprev) &&
2536                                             $fix && $line =~ /^\+/) {
2537                                                 $fixed[$fixlinenr] =~
2538                                                     s/^\+[ \t]*/\+$goodtabindent/;
2539                                         }
2540                                 }
2541                         }
2542                 }
2543
2544                 if ($line =~ /^\+.*(\w+\s*)?\(\s*$Type\s*\)[ \t]+(?!$Assignment|$Arithmetic|[,;\({\[\<\>])/ &&
2545                     (!defined($1) || $1 !~ /sizeof\s*/)) {
2546                         if (CHK("SPACING",
2547                                 "No space is necessary after a cast\n" . $herecurr) &&
2548                             $fix) {
2549                                 $fixed[$fixlinenr] =~
2550                                     s/(\(\s*$Type\s*\))[ \t]+/$1/;
2551                         }
2552                 }
2553
2554                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2555                     $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
2556                     $rawline =~ /^\+[ \t]*\*/ &&
2557                     $realline > 2) {
2558                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2559                              "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
2560                 }
2561
2562                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2563                     $prevrawline =~ /^\+[ \t]*\/\*/ &&          #starting /*
2564                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
2565                     $rawline =~ /^\+/ &&                        #line is new
2566                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
2567                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2568                              "networking block comments start with * on subsequent lines\n" . $hereprev);
2569                 }
2570
2571                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2572                     $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
2573                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
2574                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
2575                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
2576                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2577                              "networking block comments put the trailing */ on a separate line\n" . $herecurr);
2578                 }
2579
2580 # check for missing blank lines after struct/union declarations
2581 # with exceptions for various attributes and macros
2582                 if ($prevline =~ /^[\+ ]};?\s*$/ &&
2583                     $line =~ /^\+/ &&
2584                     !($line =~ /^\+\s*$/ ||
2585                       $line =~ /^\+\s*EXPORT_SYMBOL/ ||
2586                       $line =~ /^\+\s*MODULE_/i ||
2587                       $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
2588                       $line =~ /^\+[a-z_]*init/ ||
2589                       $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
2590                       $line =~ /^\+\s*DECLARE/ ||
2591                       $line =~ /^\+\s*__setup/)) {
2592                         if (CHK("LINE_SPACING",
2593                                 "Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) &&
2594                             $fix) {
2595                                 fix_insert_line($fixlinenr, "\+");
2596                         }
2597                 }
2598
2599 # check for multiple consecutive blank lines
2600                 if ($prevline =~ /^[\+ ]\s*$/ &&
2601                     $line =~ /^\+\s*$/ &&
2602                     $last_blank_line != ($linenr - 1)) {
2603                         if (CHK("LINE_SPACING",
2604                                 "Please don't use multiple blank lines\n" . $hereprev) &&
2605                             $fix) {
2606                                 fix_delete_line($fixlinenr, $rawline);
2607                         }
2608
2609                         $last_blank_line = $linenr;
2610                 }
2611
2612 # check for missing blank lines after declarations
2613                 if ($sline =~ /^\+\s+\S/ &&                     #Not at char 1
2614                         # actual declarations
2615                     ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
2616                         # function pointer declarations
2617                      $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
2618                         # foo bar; where foo is some local typedef or #define
2619                      $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
2620                         # known declaration macros
2621                      $prevline =~ /^\+\s+$declaration_macros/) &&
2622                         # for "else if" which can look like "$Ident $Ident"
2623                     !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
2624                         # other possible extensions of declaration lines
2625                       $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
2626                         # not starting a section or a macro "\" extended line
2627                       $prevline =~ /(?:\{\s*|\\)$/) &&
2628                         # looks like a declaration
2629                     !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
2630                         # function pointer declarations
2631                       $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
2632                         # foo bar; where foo is some local typedef or #define
2633                       $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
2634                         # known declaration macros
2635                       $sline =~ /^\+\s+$declaration_macros/ ||
2636                         # start of struct or union or enum
2637                       $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
2638                         # start or end of block or continuation of declaration
2639                       $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
2640                         # bitfield continuation
2641                       $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
2642                         # other possible extensions of declaration lines
2643                       $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
2644                         # indentation of previous and current line are the same
2645                     (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
2646                         if (WARN("LINE_SPACING",
2647                                  "Missing a blank line after declarations\n" . $hereprev) &&
2648                             $fix) {
2649                                 fix_insert_line($fixlinenr, "\+");
2650                         }
2651                 }
2652
2653 # check for spaces at the beginning of a line.
2654 # Exceptions:
2655 #  1) within comments
2656 #  2) indented preprocessor commands
2657 #  3) hanging labels
2658                 if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {
2659                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2660                         if (WARN("LEADING_SPACE",
2661                                  "please, no spaces at the start of a line\n" . $herevet) &&
2662                             $fix) {
2663                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
2664                         }
2665                 }
2666
2667 # check we are in a valid C source file if not then ignore this hunk
2668                 next if ($realfile !~ /\.(h|c)$/);
2669
2670 # check indentation of any line with a bare else
2671 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
2672 # if the previous line is a break or return and is indented 1 tab more...
2673                 if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
2674                         my $tabs = length($1) + 1;
2675                         if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
2676                             ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
2677                              defined $lines[$linenr] &&
2678                              $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
2679                                 WARN("UNNECESSARY_ELSE",
2680                                      "else is not generally useful after a break or return\n" . $hereprev);
2681                         }
2682                 }
2683
2684 # check indentation of a line with a break;
2685 # if the previous line is a goto or return and is indented the same # of tabs
2686                 if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
2687                         my $tabs = $1;
2688                         if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
2689                                 WARN("UNNECESSARY_BREAK",
2690                                      "break is not useful after a goto or return\n" . $hereprev);
2691                         }
2692                 }
2693
2694 # discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
2695                 if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
2696                         WARN("CONFIG_EXPERIMENTAL",
2697                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
2698                 }
2699
2700 # check for RCS/CVS revision markers
2701                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
2702                         WARN("CVS_KEYWORD",
2703                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
2704                 }
2705
2706 # Blackfin: don't use __builtin_bfin_[cs]sync
2707                 if ($line =~ /__builtin_bfin_csync/) {
2708                         my $herevet = "$here\n" . cat_vet($line) . "\n";
2709                         ERROR("CSYNC",
2710                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
2711                 }
2712                 if ($line =~ /__builtin_bfin_ssync/) {
2713                         my $herevet = "$here\n" . cat_vet($line) . "\n";
2714                         ERROR("SSYNC",
2715                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
2716                 }
2717
2718 # check for old HOTPLUG __dev<foo> section markings
2719                 if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
2720                         WARN("HOTPLUG_SECTION",
2721                              "Using $1 is unnecessary\n" . $herecurr);
2722                 }
2723
2724 # Check for potential 'bare' types
2725                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
2726                     $realline_next);
2727 #print "LINE<$line>\n";
2728                 if ($linenr >= $suppress_statement &&
2729                     $realcnt && $sline =~ /.\s*\S/) {
2730                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2731                                 ctx_statement_block($linenr, $realcnt, 0);
2732                         $stat =~ s/\n./\n /g;
2733                         $cond =~ s/\n./\n /g;
2734
2735 #print "linenr<$linenr> <$stat>\n";
2736                         # If this statement has no statement boundaries within
2737                         # it there is no point in retrying a statement scan
2738                         # until we hit end of it.
2739                         my $frag = $stat; $frag =~ s/;+\s*$//;
2740                         if ($frag !~ /(?:{|;)/) {
2741 #print "skip<$line_nr_next>\n";
2742                                 $suppress_statement = $line_nr_next;
2743                         }
2744
2745                         # Find the real next line.
2746                         $realline_next = $line_nr_next;
2747                         if (defined $realline_next &&
2748                             (!defined $lines[$realline_next - 1] ||
2749                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
2750                                 $realline_next++;
2751                         }
2752
2753                         my $s = $stat;
2754                         $s =~ s/{.*$//s;
2755
2756                         # Ignore goto labels.
2757                         if ($s =~ /$Ident:\*$/s) {
2758
2759                         # Ignore functions being called
2760                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
2761
2762                         } elsif ($s =~ /^.\s*else\b/s) {
2763
2764                         # declarations always start with types
2765                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
2766                                 my $type = $1;
2767                                 $type =~ s/\s+/ /g;
2768                                 possible($type, "A:" . $s);
2769
2770                         # definitions in global scope can only start with types
2771                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
2772                                 possible($1, "B:" . $s);
2773                         }
2774
2775                         # any (foo ... *) is a pointer cast, and foo is a type
2776                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
2777                                 possible($1, "C:" . $s);
2778                         }
2779
2780                         # Check for any sort of function declaration.
2781                         # int foo(something bar, other baz);
2782                         # void (*store_gdt)(x86_descr_ptr *);
2783                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
2784                                 my ($name_len) = length($1);
2785
2786                                 my $ctx = $s;
2787                                 substr($ctx, 0, $name_len + 1, '');
2788                                 $ctx =~ s/\)[^\)]*$//;
2789
2790                                 for my $arg (split(/\s*,\s*/, $ctx)) {
2791                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
2792
2793                                                 possible($1, "D:" . $s);
2794                                         }
2795                                 }
2796                         }
2797
2798                 }
2799
2800 #
2801 # Checks which may be anchored in the context.
2802 #
2803
2804 # Check for switch () and associated case and default
2805 # statements should be at the same indent.
2806                 if ($line=~/\bswitch\s*\(.*\)/) {
2807                         my $err = '';
2808                         my $sep = '';
2809                         my @ctx = ctx_block_outer($linenr, $realcnt);
2810                         shift(@ctx);
2811                         for my $ctx (@ctx) {
2812                                 my ($clen, $cindent) = line_stats($ctx);
2813                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
2814                                                         $indent != $cindent) {
2815                                         $err .= "$sep$ctx\n";
2816                                         $sep = '';
2817                                 } else {
2818                                         $sep = "[...]\n";
2819                                 }
2820                         }
2821                         if ($err ne '') {
2822                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
2823                                       "switch and case should be at the same indent\n$hereline$err");
2824                         }
2825                 }
2826
2827 # if/while/etc brace do not go on next line, unless defining a do while loop,
2828 # or if that brace on the next line is for something else
2829                 if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
2830                         my $pre_ctx = "$1$2";
2831
2832                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
2833
2834                         if ($line =~ /^\+\t{6,}/) {
2835                                 WARN("DEEP_INDENTATION",
2836                                      "Too many leading tabs - consider code refactoring\n" . $herecurr);
2837                         }
2838
2839                         my $ctx_cnt = $realcnt - $#ctx - 1;
2840                         my $ctx = join("\n", @ctx);
2841
2842                         my $ctx_ln = $linenr;
2843                         my $ctx_skip = $realcnt;
2844
2845                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
2846                                         defined $lines[$ctx_ln - 1] &&
2847                                         $lines[$ctx_ln - 1] =~ /^-/)) {
2848                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
2849                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
2850                                 $ctx_ln++;
2851                         }
2852
2853                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
2854                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
2855
2856                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
2857                                 ERROR("OPEN_BRACE",
2858                                       "that open brace { should be on the previous line\n" .
2859                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2860                         }
2861                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
2862                             $ctx =~ /\)\s*\;\s*$/ &&
2863                             defined $lines[$ctx_ln - 1])
2864                         {
2865                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
2866                                 if ($nindent > $indent) {
2867                                         WARN("TRAILING_SEMICOLON",
2868                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
2869                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2870                                 }
2871                         }
2872                 }
2873
2874 # Check relative indent for conditionals and blocks.
2875                 if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
2876                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2877                                 ctx_statement_block($linenr, $realcnt, 0)
2878                                         if (!defined $stat);
2879                         my ($s, $c) = ($stat, $cond);
2880
2881                         substr($s, 0, length($c), '');
2882
2883                         # Make sure we remove the line prefixes as we have
2884                         # none on the first line, and are going to readd them
2885                         # where necessary.
2886                         $s =~ s/\n./\n/gs;
2887
2888                         # Find out how long the conditional actually is.
2889                         my @newlines = ($c =~ /\n/gs);
2890                         my $cond_lines = 1 + $#newlines;
2891
2892                         # We want to check the first line inside the block
2893                         # starting at the end of the conditional, so remove:
2894                         #  1) any blank line termination
2895                         #  2) any opening brace { on end of the line
2896                         #  3) any do (...) {
2897                         my $continuation = 0;
2898                         my $check = 0;
2899                         $s =~ s/^.*\bdo\b//;
2900                         $s =~ s/^\s*{//;
2901                         if ($s =~ s/^\s*\\//) {
2902                                 $continuation = 1;
2903                         }
2904                         if ($s =~ s/^\s*?\n//) {
2905                                 $check = 1;
2906                                 $cond_lines++;
2907                         }
2908
2909                         # Also ignore a loop construct at the end of a
2910                         # preprocessor statement.
2911                         if (($prevline =~ /^.\s*#\s*define\s/ ||
2912                             $prevline =~ /\\\s*$/) && $continuation == 0) {
2913                                 $check = 0;
2914                         }
2915
2916                         my $cond_ptr = -1;
2917                         $continuation = 0;
2918                         while ($cond_ptr != $cond_lines) {
2919                                 $cond_ptr = $cond_lines;
2920
2921                                 # If we see an #else/#elif then the code
2922                                 # is not linear.
2923                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2924                                         $check = 0;
2925                                 }
2926
2927                                 # Ignore:
2928                                 #  1) blank lines, they should be at 0,
2929                                 #  2) preprocessor lines, and
2930                                 #  3) labels.
2931                                 if ($continuation ||
2932                                     $s =~ /^\s*?\n/ ||
2933                                     $s =~ /^\s*#\s*?/ ||
2934                                     $s =~ /^\s*$Ident\s*:/) {
2935                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2936                                         if ($s =~ s/^.*?\n//) {
2937                                                 $cond_lines++;
2938                                         }
2939                                 }
2940                         }
2941
2942                         my (undef, $sindent) = line_stats("+" . $s);
2943                         my $stat_real = raw_line($linenr, $cond_lines);
2944
2945                         # Check if either of these lines are modified, else
2946                         # this is not this patch's fault.
2947                         if (!defined($stat_real) ||
2948                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2949                                 $check = 0;
2950                         }
2951                         if (defined($stat_real) && $cond_lines > 1) {
2952                                 $stat_real = "[...]\n$stat_real";
2953                         }
2954
2955                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
2956
2957                         if ($check && (($sindent % 8) != 0 ||
2958                             ($sindent <= $indent && $s ne ''))) {
2959                                 WARN("SUSPECT_CODE_INDENT",
2960                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2961                         }
2962                 }
2963
2964                 # Track the 'values' across context and added lines.
2965                 my $opline = $line; $opline =~ s/^./ /;
2966                 my ($curr_values, $curr_vars) =
2967                                 annotate_values($opline . "\n", $prev_values);
2968                 $curr_values = $prev_values . $curr_values;
2969                 if ($dbg_values) {
2970                         my $outline = $opline; $outline =~ s/\t/ /g;
2971                         print "$linenr > .$outline\n";
2972                         print "$linenr > $curr_values\n";
2973                         print "$linenr >  $curr_vars\n";
2974                 }
2975                 $prev_values = substr($curr_values, -1);
2976
2977 #ignore lines not being added
2978                 next if ($line =~ /^[^\+]/);
2979
2980 # TEST: allow direct testing of the type matcher.
2981                 if ($dbg_type) {
2982                         if ($line =~ /^.\s*$Declare\s*$/) {
2983                                 ERROR("TEST_TYPE",
2984                                       "TEST: is type\n" . $herecurr);
2985                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2986                                 ERROR("TEST_NOT_TYPE",
2987                                       "TEST: is not type ($1 is)\n". $herecurr);
2988                         }
2989                         next;
2990                 }
2991 # TEST: allow direct testing of the attribute matcher.
2992                 if ($dbg_attr) {
2993                         if ($line =~ /^.\s*$Modifier\s*$/) {
2994                                 ERROR("TEST_ATTR",
2995                                       "TEST: is attr\n" . $herecurr);
2996                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2997                                 ERROR("TEST_NOT_ATTR",
2998                                       "TEST: is not attr ($1 is)\n". $herecurr);
2999                         }
3000                         next;
3001                 }
3002
3003 # check for initialisation to aggregates open brace on the next line
3004                 if ($line =~ /^.\s*{/ &&
3005                     $prevline =~ /(?:^|[^=])=\s*$/) {
3006                         if (ERROR("OPEN_BRACE",
3007                                   "that open brace { should be on the previous line\n" . $hereprev) &&
3008                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3009                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3010                                 fix_delete_line($fixlinenr, $rawline);
3011                                 my $fixedline = $prevrawline;
3012                                 $fixedline =~ s/\s*=\s*$/ = {/;
3013                                 fix_insert_line($fixlinenr, $fixedline);
3014                                 $fixedline = $line;
3015                                 $fixedline =~ s/^(.\s*){\s*/$1/;
3016                                 fix_insert_line($fixlinenr, $fixedline);
3017                         }
3018                 }
3019
3020 #
3021 # Checks which are anchored on the added line.
3022 #
3023
3024 # check for malformed paths in #include statements (uses RAW line)
3025                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
3026                         my $path = $1;
3027                         if ($path =~ m{//}) {
3028                                 ERROR("MALFORMED_INCLUDE",
3029                                       "malformed #include filename\n" . $herecurr);
3030                         }
3031                         if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
3032                                 ERROR("UAPI_INCLUDE",
3033                                       "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
3034                         }
3035                 }
3036
3037 # no C99 // comments
3038                 if ($line =~ m{//}) {
3039                         if (ERROR("C99_COMMENTS",
3040                                   "do not use C99 // comments\n" . $herecurr) &&
3041                             $fix) {
3042                                 my $line = $fixed[$fixlinenr];
3043                                 if ($line =~ /\/\/(.*)$/) {
3044                                         my $comment = trim($1);
3045                                         $fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@;
3046                                 }
3047                         }
3048                 }
3049                 # Remove C99 comments.
3050                 $line =~ s@//.*@@;
3051                 $opline =~ s@//.*@@;
3052
3053 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
3054 # the whole statement.
3055 #print "APW <$lines[$realline_next - 1]>\n";
3056                 if (defined $realline_next &&
3057                     exists $lines[$realline_next - 1] &&
3058                     !defined $suppress_export{$realline_next} &&
3059                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
3060                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
3061                         # Handle definitions which produce identifiers with
3062                         # a prefix:
3063                         #   XXX(foo);
3064                         #   EXPORT_SYMBOL(something_foo);
3065                         my $name = $1;
3066                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
3067                             $name =~ /^${Ident}_$2/) {
3068 #print "FOO C name<$name>\n";
3069                                 $suppress_export{$realline_next} = 1;
3070
3071                         } elsif ($stat !~ /(?:
3072                                 \n.}\s*$|
3073                                 ^.DEFINE_$Ident\(\Q$name\E\)|
3074                                 ^.DECLARE_$Ident\(\Q$name\E\)|
3075                                 ^.LIST_HEAD\(\Q$name\E\)|
3076                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
3077                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
3078                             )/x) {
3079 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
3080                                 $suppress_export{$realline_next} = 2;
3081                         } else {
3082                                 $suppress_export{$realline_next} = 1;
3083                         }
3084                 }
3085                 if (!defined $suppress_export{$linenr} &&
3086                     $prevline =~ /^.\s*$/ &&
3087                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
3088                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
3089 #print "FOO B <$lines[$linenr - 1]>\n";
3090                         $suppress_export{$linenr} = 2;
3091                 }
3092                 if (defined $suppress_export{$linenr} &&
3093                     $suppress_export{$linenr} == 2) {
3094                         WARN("EXPORT_SYMBOL",
3095                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
3096                 }
3097
3098 # check for global initialisers.
3099                 if ($line =~ /^\+(\s*$Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/) {
3100                         if (ERROR("GLOBAL_INITIALISERS",
3101                                   "do not initialise globals to 0 or NULL\n" .
3102                                       $herecurr) &&
3103                             $fix) {
3104                                 $fixed[$fixlinenr] =~ s/($Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/$1;/;
3105                         }
3106                 }
3107 # check for static initialisers.
3108                 if ($line =~ /^\+.*\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
3109                         if (ERROR("INITIALISED_STATIC",
3110                                   "do not initialise statics to 0 or NULL\n" .
3111                                       $herecurr) &&
3112                             $fix) {
3113                                 $fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*(0|NULL|false)\s*;/$1;/;
3114                         }
3115                 }
3116
3117 # check for misordered declarations of char/short/int/long with signed/unsigned
3118                 while ($sline =~ m{(\b$TypeMisordered\b)}g) {
3119                         my $tmp = trim($1);
3120                         WARN("MISORDERED_TYPE",
3121                              "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
3122                 }
3123
3124 # check for static const char * arrays.
3125                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
3126                         WARN("STATIC_CONST_CHAR_ARRAY",
3127                              "static const char * array should probably be static const char * const\n" .
3128                                 $herecurr);
3129                }
3130
3131 # check for static char foo[] = "bar" declarations.
3132                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
3133                         WARN("STATIC_CONST_CHAR_ARRAY",
3134                              "static char array declaration should probably be static const char\n" .
3135                                 $herecurr);
3136                }
3137
3138 # check for non-global char *foo[] = {"bar", ...} declarations.
3139                 if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
3140                         WARN("STATIC_CONST_CHAR_ARRAY",
3141                              "char * array declaration might be better as static const\n" .
3142                                 $herecurr);
3143                }
3144
3145 # check for function declarations without arguments like "int foo()"
3146                 if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
3147                         if (ERROR("FUNCTION_WITHOUT_ARGS",
3148                                   "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
3149                             $fix) {
3150                                 $fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
3151                         }
3152                 }
3153
3154 # check for uses of DEFINE_PCI_DEVICE_TABLE
3155                 if ($line =~ /\bDEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=/) {
3156                         if (WARN("DEFINE_PCI_DEVICE_TABLE",
3157                                  "Prefer struct pci_device_id over deprecated DEFINE_PCI_DEVICE_TABLE\n" . $herecurr) &&
3158                             $fix) {
3159                                 $fixed[$fixlinenr] =~ s/\b(?:static\s+|)DEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=\s*/static const struct pci_device_id $1\[\] = /;
3160                         }
3161                 }
3162
3163 # check for new typedefs, only function parameters and sparse annotations
3164 # make sense.
3165                 if ($line =~ /\btypedef\s/ &&
3166                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
3167                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
3168                     $line !~ /\b$typeTypedefs\b/ &&
3169                     $line !~ /\b$typeOtherOSTypedefs\b/ &&
3170                     $line !~ /\b__bitwise(?:__|)\b/) {
3171                         WARN("NEW_TYPEDEFS",
3172                              "do not add new typedefs\n" . $herecurr);
3173                 }
3174
3175 # * goes on variable not on type
3176                 # (char*[ const])
3177                 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
3178                         #print "AA<$1>\n";
3179                         my ($ident, $from, $to) = ($1, $2, $2);
3180
3181                         # Should start with a space.
3182                         $to =~ s/^(\S)/ $1/;
3183                         # Should not end with a space.
3184                         $to =~ s/\s+$//;
3185                         # '*'s should not have spaces between.
3186                         while ($to =~ s/\*\s+\*/\*\*/) {
3187                         }
3188
3189 ##                      print "1: from<$from> to<$to> ident<$ident>\n";
3190                         if ($from ne $to) {
3191                                 if (ERROR("POINTER_LOCATION",
3192                                           "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
3193                                     $fix) {
3194                                         my $sub_from = $ident;
3195                                         my $sub_to = $ident;
3196                                         $sub_to =~ s/\Q$from\E/$to/;
3197                                         $fixed[$fixlinenr] =~
3198                                             s@\Q$sub_from\E@$sub_to@;
3199                                 }
3200                         }
3201                 }
3202                 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
3203                         #print "BB<$1>\n";
3204                         my ($match, $from, $to, $ident) = ($1, $2, $2, $3);
3205
3206                         # Should start with a space.
3207                         $to =~ s/^(\S)/ $1/;
3208                         # Should not end with a space.
3209                         $to =~ s/\s+$//;
3210                         # '*'s should not have spaces between.
3211                         while ($to =~ s/\*\s+\*/\*\*/) {
3212                         }
3213                         # Modifiers should have spaces.
3214                         $to =~ s/(\b$Modifier$)/$1 /;
3215
3216 ##                      print "2: from<$from> to<$to> ident<$ident>\n";
3217                         if ($from ne $to && $ident !~ /^$Modifier$/) {
3218                                 if (ERROR("POINTER_LOCATION",
3219                                           "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
3220                                     $fix) {
3221
3222                                         my $sub_from = $match;
3223                                         my $sub_to = $match;
3224                                         $sub_to =~ s/\Q$from\E/$to/;
3225                                         $fixed[$fixlinenr] =~
3226                                             s@\Q$sub_from\E@$sub_to@;
3227                                 }
3228                         }
3229                 }
3230
3231 # # no BUG() or BUG_ON()
3232 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
3233 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
3234 #                       print "$herecurr";
3235 #                       $clean = 0;
3236 #               }
3237
3238                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
3239                         WARN("LINUX_VERSION_CODE",
3240                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
3241                 }
3242
3243 # check for uses of printk_ratelimit
3244                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
3245                         WARN("PRINTK_RATELIMITED",
3246 "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
3247                 }
3248
3249 # printk should use KERN_* levels.  Note that follow on printk's on the
3250 # same line do not need a level, so we use the current block context
3251 # to try and find and validate the current printk.  In summary the current
3252 # printk includes all preceding printk's which have no newline on the end.
3253 # we assume the first bad printk is the one to report.
3254                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
3255                         my $ok = 0;
3256                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
3257                                 #print "CHECK<$lines[$ln - 1]\n";
3258                                 # we have a preceding printk if it ends
3259                                 # with "\n" ignore it, else it is to blame
3260                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
3261                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
3262                                                 $ok = 1;
3263                                         }
3264                                         last;
3265                                 }
3266                         }
3267                         if ($ok == 0) {
3268                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
3269                                      "printk() should include KERN_ facility level\n" . $herecurr);
3270                         }
3271                 }
3272
3273                 if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
3274                         my $orig = $1;
3275                         my $level = lc($orig);
3276                         $level = "warn" if ($level eq "warning");
3277                         my $level2 = $level;
3278                         $level2 = "dbg" if ($level eq "debug");
3279                         WARN("PREFER_PR_LEVEL",
3280                              "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
3281                 }
3282
3283                 if ($line =~ /\bpr_warning\s*\(/) {
3284                         if (WARN("PREFER_PR_LEVEL",
3285                                  "Prefer pr_warn(... to pr_warning(...\n" . $herecurr) &&
3286                             $fix) {
3287                                 $fixed[$fixlinenr] =~
3288                                     s/\bpr_warning\b/pr_warn/;
3289                         }
3290                 }
3291
3292                 if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
3293                         my $orig = $1;
3294                         my $level = lc($orig);
3295                         $level = "warn" if ($level eq "warning");
3296                         $level = "dbg" if ($level eq "debug");
3297                         WARN("PREFER_DEV_LEVEL",
3298                              "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
3299                 }
3300
3301 # function brace can't be on same line, except for #defines of do while,
3302 # or if closed on same line
3303                 if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and
3304                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
3305                         if (ERROR("OPEN_BRACE",
3306                                   "open brace '{' following function declarations go on the next line\n" . $herecurr) &&
3307                             $fix) {
3308                                 fix_delete_line($fixlinenr, $rawline);
3309                                 my $fixed_line = $rawline;
3310                                 $fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/;
3311                                 my $line1 = $1;
3312                                 my $line2 = $2;
3313                                 fix_insert_line($fixlinenr, ltrim($line1));
3314                                 fix_insert_line($fixlinenr, "\+{");
3315                                 if ($line2 !~ /^\s*$/) {
3316                                         fix_insert_line($fixlinenr, "\+\t" . trim($line2));
3317                                 }
3318                         }
3319                 }
3320
3321 # open braces for enum, union and struct go on the same line.
3322                 if ($line =~ /^.\s*{/ &&
3323                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
3324                         if (ERROR("OPEN_BRACE",
3325                                   "open brace '{' following $1 go on the same line\n" . $hereprev) &&
3326                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3327                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3328                                 fix_delete_line($fixlinenr, $rawline);
3329                                 my $fixedline = rtrim($prevrawline) . " {";
3330                                 fix_insert_line($fixlinenr, $fixedline);
3331                                 $fixedline = $rawline;
3332                                 $fixedline =~ s/^(.\s*){\s*/$1\t/;
3333                                 if ($fixedline !~ /^\+\s*$/) {
3334                                         fix_insert_line($fixlinenr, $fixedline);
3335                                 }
3336                         }
3337                 }
3338
3339 # missing space after union, struct or enum definition
3340                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
3341                         if (WARN("SPACING",
3342                                  "missing space after $1 definition\n" . $herecurr) &&
3343                             $fix) {
3344                                 $fixed[$fixlinenr] =~
3345                                     s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
3346                         }
3347                 }
3348
3349 # Function pointer declarations
3350 # check spacing between type, funcptr, and args
3351 # canonical declaration is "type (*funcptr)(args...)"
3352                 if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
3353                         my $declare = $1;
3354                         my $pre_pointer_space = $2;
3355                         my $post_pointer_space = $3;
3356                         my $funcname = $4;
3357                         my $post_funcname_space = $5;
3358                         my $pre_args_space = $6;
3359
3360 # the $Declare variable will capture all spaces after the type
3361 # so check it for a missing trailing missing space but pointer return types
3362 # don't need a space so don't warn for those.
3363                         my $post_declare_space = "";
3364                         if ($declare =~ /(\s+)$/) {
3365                                 $post_declare_space = $1;
3366                                 $declare = rtrim($declare);
3367                         }
3368                         if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
3369                                 WARN("SPACING",
3370                                      "missing space after return type\n" . $herecurr);
3371                                 $post_declare_space = " ";
3372                         }
3373
3374 # unnecessary space "type  (*funcptr)(args...)"
3375 # This test is not currently implemented because these declarations are
3376 # equivalent to
3377 #       int  foo(int bar, ...)
3378 # and this is form shouldn't/doesn't generate a checkpatch warning.
3379 #
3380 #                       elsif ($declare =~ /\s{2,}$/) {
3381 #                               WARN("SPACING",
3382 #                                    "Multiple spaces after return type\n" . $herecurr);
3383 #                       }
3384
3385 # unnecessary space "type ( *funcptr)(args...)"
3386                         if (defined $pre_pointer_space &&
3387                             $pre_pointer_space =~ /^\s/) {
3388                                 WARN("SPACING",
3389                                      "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
3390                         }
3391
3392 # unnecessary space "type (* funcptr)(args...)"
3393                         if (defined $post_pointer_space &&
3394                             $post_pointer_space =~ /^\s/) {
3395                                 WARN("SPACING",
3396                                      "Unnecessary space before function pointer name\n" . $herecurr);
3397                         }
3398
3399 # unnecessary space "type (*funcptr )(args...)"
3400                         if (defined $post_funcname_space &&
3401                             $post_funcname_space =~ /^\s/) {
3402                                 WARN("SPACING",
3403                                      "Unnecessary space after function pointer name\n" . $herecurr);
3404                         }
3405
3406 # unnecessary space "type (*funcptr) (args...)"
3407                         if (defined $pre_args_space &&
3408                             $pre_args_space =~ /^\s/) {
3409                                 WARN("SPACING",
3410                                      "Unnecessary space before function pointer arguments\n" . $herecurr);
3411                         }
3412
3413                         if (show_type("SPACING") && $fix) {
3414                                 $fixed[$fixlinenr] =~
3415                                     s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
3416                         }
3417                 }
3418
3419 # check for spacing round square brackets; allowed:
3420 #  1. with a type on the left -- int [] a;
3421 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
3422 #  3. inside a curly brace -- = { [0...10] = 5 }
3423                 while ($line =~ /(.*?\s)\[/g) {
3424                         my ($where, $prefix) = ($-[1], $1);
3425                         if ($prefix !~ /$Type\s+$/ &&
3426                             ($where != 0 || $prefix !~ /^.\s+$/) &&
3427                             $prefix !~ /[{,]\s+$/) {
3428                                 if (ERROR("BRACKET_SPACE",
3429                                           "space prohibited before open square bracket '['\n" . $herecurr) &&
3430                                     $fix) {
3431                                     $fixed[$fixlinenr] =~
3432                                         s/^(\+.*?)\s+\[/$1\[/;
3433                                 }
3434                         }
3435                 }
3436
3437 # check for spaces between functions and their parentheses.
3438                 while ($line =~ /($Ident)\s+\(/g) {
3439                         my $name = $1;
3440                         my $ctx_before = substr($line, 0, $-[1]);
3441                         my $ctx = "$ctx_before$name";
3442
3443                         # Ignore those directives where spaces _are_ permitted.
3444                         if ($name =~ /^(?:
3445                                 if|for|while|switch|return|case|
3446                                 volatile|__volatile__|
3447                                 __attribute__|format|__extension__|
3448                                 asm|__asm__)$/x)
3449                         {
3450                         # cpp #define statements have non-optional spaces, ie
3451                         # if there is a space between the name and the open
3452                         # parenthesis it is simply not a parameter group.
3453                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
3454
3455                         # cpp #elif statement condition may start with a (
3456                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
3457
3458                         # If this whole things ends with a type its most
3459                         # likely a typedef for a function.
3460                         } elsif ($ctx =~ /$Type$/) {
3461
3462                         } else {
3463                                 if (WARN("SPACING",
3464                                          "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
3465                                              $fix) {
3466                                         $fixed[$fixlinenr] =~
3467                                             s/\b$name\s+\(/$name\(/;
3468                                 }
3469                         }
3470                 }
3471
3472 # Check operator spacing.
3473                 if (!($line=~/\#\s*include/)) {
3474                         my $fixed_line = "";
3475                         my $line_fixed = 0;
3476
3477                         my $ops = qr{
3478                                 <<=|>>=|<=|>=|==|!=|
3479                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
3480                                 =>|->|<<|>>|<|>|=|!|~|
3481                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
3482                                 \?:|\?|:
3483                         }x;
3484                         my @elements = split(/($ops|;)/, $opline);
3485
3486 ##                      print("element count: <" . $#elements . ">\n");
3487 ##                      foreach my $el (@elements) {
3488 ##                              print("el: <$el>\n");
3489 ##                      }
3490
3491                         my @fix_elements = ();
3492                         my $off = 0;
3493
3494                         foreach my $el (@elements) {
3495                                 push(@fix_elements, substr($rawline, $off, length($el)));
3496                                 $off += length($el);
3497                         }
3498
3499                         $off = 0;
3500
3501                         my $blank = copy_spacing($opline);
3502                         my $last_after = -1;
3503
3504                         for (my $n = 0; $n < $#elements; $n += 2) {
3505
3506                                 my $good = $fix_elements[$n] . $fix_elements[$n + 1];
3507
3508 ##                              print("n: <$n> good: <$good>\n");
3509
3510                                 $off += length($elements[$n]);
3511
3512                                 # Pick up the preceding and succeeding characters.
3513                                 my $ca = substr($opline, 0, $off);
3514                                 my $cc = '';
3515                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
3516                                         $cc = substr($opline, $off + length($elements[$n + 1]));
3517                                 }
3518                                 my $cb = "$ca$;$cc";
3519
3520                                 my $a = '';
3521                                 $a = 'V' if ($elements[$n] ne '');
3522                                 $a = 'W' if ($elements[$n] =~ /\s$/);
3523                                 $a = 'C' if ($elements[$n] =~ /$;$/);
3524                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
3525                                 $a = 'O' if ($elements[$n] eq '');
3526                                 $a = 'E' if ($ca =~ /^\s*$/);
3527
3528                                 my $op = $elements[$n + 1];
3529
3530                                 my $c = '';
3531                                 if (defined $elements[$n + 2]) {
3532                                         $c = 'V' if ($elements[$n + 2] ne '');
3533                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
3534                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
3535                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
3536                                         $c = 'O' if ($elements[$n + 2] eq '');
3537                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
3538                                 } else {
3539                                         $c = 'E';
3540                                 }
3541
3542                                 my $ctx = "${a}x${c}";
3543
3544                                 my $at = "(ctx:$ctx)";
3545
3546                                 my $ptr = substr($blank, 0, $off) . "^";
3547                                 my $hereptr = "$hereline$ptr\n";
3548
3549                                 # Pull out the value of this operator.
3550                                 my $op_type = substr($curr_values, $off + 1, 1);
3551
3552                                 # Get the full operator variant.
3553                                 my $opv = $op . substr($curr_vars, $off, 1);
3554
3555                                 # Ignore operators passed as parameters.
3556                                 if ($op_type ne 'V' &&
3557                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
3558
3559 #                               # Ignore comments
3560 #                               } elsif ($op =~ /^$;+$/) {
3561
3562                                 # ; should have either the end of line or a space or \ after it
3563                                 } elsif ($op eq ';') {
3564                                         if ($ctx !~ /.x[WEBC]/ &&
3565                                             $cc !~ /^\\/ && $cc !~ /^;/) {
3566                                                 if (ERROR("SPACING",
3567                                                           "space required after that '$op' $at\n" . $hereptr)) {
3568                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
3569                                                         $line_fixed = 1;
3570                                                 }
3571                                         }
3572
3573                                 # // is a comment
3574                                 } elsif ($op eq '//') {
3575
3576                                 #   :   when part of a bitfield
3577                                 } elsif ($opv eq ':B') {
3578                                         # skip the bitfield test for now
3579
3580                                 # No spaces for:
3581                                 #   ->
3582                                 } elsif ($op eq '->') {
3583                                         if ($ctx =~ /Wx.|.xW/) {
3584                                                 if (ERROR("SPACING",
3585                                                           "spaces prohibited around that '$op' $at\n" . $hereptr)) {
3586                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3587                                                         if (defined $fix_elements[$n + 2]) {
3588                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3589                                                         }
3590                                                         $line_fixed = 1;
3591                                                 }
3592                                         }
3593
3594                                 # , must not have a space before and must have a space on the right.
3595                                 } elsif ($op eq ',') {
3596                                         my $rtrim_before = 0;
3597                                         my $space_after = 0;
3598                                         if ($ctx =~ /Wx./) {
3599                                                 if (ERROR("SPACING",
3600                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3601                                                         $line_fixed = 1;
3602                                                         $rtrim_before = 1;
3603                                                 }
3604                                         }
3605                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
3606                                                 if (ERROR("SPACING",
3607                                                           "space required after that '$op' $at\n" . $hereptr)) {
3608                                                         $line_fixed = 1;
3609                                                         $last_after = $n;
3610                                                         $space_after = 1;
3611                                                 }
3612                                         }
3613                                         if ($rtrim_before || $space_after) {
3614                                                 if ($rtrim_before) {
3615                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3616                                                 } else {
3617                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
3618                                                 }
3619                                                 if ($space_after) {
3620                                                         $good .= " ";
3621                                                 }
3622                                         }
3623
3624                                 # '*' as part of a type definition -- reported already.
3625                                 } elsif ($opv eq '*_') {
3626                                         #warn "'*' is part of type\n";
3627
3628                                 # unary operators should have a space before and
3629                                 # none after.  May be left adjacent to another
3630                                 # unary operator, or a cast
3631                                 } elsif ($op eq '!' || $op eq '~' ||
3632                                          $opv eq '*U' || $opv eq '-U' ||
3633                                          $opv eq '&U' || $opv eq '&&U') {
3634                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
3635                                                 if (ERROR("SPACING",
3636                                                           "space required before that '$op' $at\n" . $hereptr)) {
3637                                                         if ($n != $last_after + 2) {
3638                                                                 $good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
3639                                                                 $line_fixed = 1;
3640                                                         }
3641                                                 }
3642                                         }
3643                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
3644                                                 # A unary '*' may be const
3645
3646                                         } elsif ($ctx =~ /.xW/) {
3647                                                 if (ERROR("SPACING",
3648                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
3649                                                         $good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
3650                                                         if (defined $fix_elements[$n + 2]) {
3651                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3652                                                         }
3653                                                         $line_fixed = 1;
3654                                                 }
3655                                         }
3656
3657                                 # unary ++ and unary -- are allowed no space on one side.
3658                                 } elsif ($op eq '++' or $op eq '--') {
3659                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
3660                                                 if (ERROR("SPACING",
3661                                                           "space required one side of that '$op' $at\n" . $hereptr)) {
3662                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
3663                                                         $line_fixed = 1;
3664                                                 }
3665                                         }
3666                                         if ($ctx =~ /Wx[BE]/ ||
3667                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
3668                                                 if (ERROR("SPACING",
3669                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3670                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3671                                                         $line_fixed = 1;
3672                                                 }
3673                                         }
3674                                         if ($ctx =~ /ExW/) {
3675                                                 if (ERROR("SPACING",
3676                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
3677                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
3678                                                         if (defined $fix_elements[$n + 2]) {
3679                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3680                                                         }
3681                                                         $line_fixed = 1;
3682                                                 }
3683                                         }
3684
3685                                 # << and >> may either have or not have spaces both sides
3686                                 } elsif ($op eq '<<' or $op eq '>>' or
3687                                          $op eq '&' or $op eq '^' or $op eq '|' or
3688                                          $op eq '+' or $op eq '-' or
3689                                          $op eq '*' or $op eq '/' or
3690                                          $op eq '%')
3691                                 {
3692                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
3693                                                 if (ERROR("SPACING",
3694                                                           "need consistent spacing around '$op' $at\n" . $hereptr)) {
3695                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3696                                                         if (defined $fix_elements[$n + 2]) {
3697                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3698                                                         }
3699                                                         $line_fixed = 1;
3700                                                 }
3701                                         }
3702
3703                                 # A colon needs no spaces before when it is
3704                                 # terminating a case value or a label.
3705                                 } elsif ($opv eq ':C' || $opv eq ':L') {
3706                                         if ($ctx =~ /Wx./) {
3707                                                 if (ERROR("SPACING",
3708                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3709                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3710                                                         $line_fixed = 1;
3711                                                 }
3712                                         }
3713
3714                                 # All the others need spaces both sides.
3715                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
3716                                         my $ok = 0;
3717
3718                                         # Ignore email addresses <foo@bar>
3719                                         if (($op eq '<' &&
3720                                              $cc =~ /^\S+\@\S+>/) ||
3721                                             ($op eq '>' &&
3722                                              $ca =~ /<\S+\@\S+$/))
3723                                         {
3724                                                 $ok = 1;
3725                                         }
3726
3727                                         # messages are ERROR, but ?: are CHK
3728                                         if ($ok == 0) {
3729                                                 my $msg_type = \&ERROR;
3730                                                 $msg_type = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);
3731
3732                                                 if (&{$msg_type}("SPACING",
3733                                                                  "spaces required around that '$op' $at\n" . $hereptr)) {
3734                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3735                                                         if (defined $fix_elements[$n + 2]) {
3736                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3737                                                         }
3738                                                         $line_fixed = 1;
3739                                                 }
3740                                         }
3741                                 }
3742                                 $off += length($elements[$n + 1]);
3743
3744 ##                              print("n: <$n> GOOD: <$good>\n");
3745
3746                                 $fixed_line = $fixed_line . $good;
3747                         }
3748
3749                         if (($#elements % 2) == 0) {
3750                                 $fixed_line = $fixed_line . $fix_elements[$#elements];
3751                         }
3752
3753                         if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) {
3754                                 $fixed[$fixlinenr] = $fixed_line;
3755                         }
3756
3757
3758                 }
3759
3760 # check for whitespace before a non-naked semicolon
3761                 if ($line =~ /^\+.*\S\s+;\s*$/) {
3762                         if (WARN("SPACING",
3763                                  "space prohibited before semicolon\n" . $herecurr) &&
3764                             $fix) {
3765                                 1 while $fixed[$fixlinenr] =~
3766                                     s/^(\+.*\S)\s+;/$1;/;
3767                         }
3768                 }
3769
3770 # check for multiple assignments
3771                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
3772                         CHK("MULTIPLE_ASSIGNMENTS",
3773                             "multiple assignments should be avoided\n" . $herecurr);
3774                 }
3775
3776 ## # check for multiple declarations, allowing for a function declaration
3777 ## # continuation.
3778 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
3779 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
3780 ##
3781 ##                      # Remove any bracketed sections to ensure we do not
3782 ##                      # falsly report the parameters of functions.
3783 ##                      my $ln = $line;
3784 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
3785 ##                      }
3786 ##                      if ($ln =~ /,/) {
3787 ##                              WARN("MULTIPLE_DECLARATION",
3788 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
3789 ##                      }
3790 ##              }
3791
3792 #need space before brace following if, while, etc
3793                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
3794                     $line =~ /do{/) {
3795                         if (ERROR("SPACING",
3796                                   "space required before the open brace '{'\n" . $herecurr) &&
3797                             $fix) {
3798                                 $fixed[$fixlinenr] =~ s/^(\+.*(?:do|\))){/$1 {/;
3799                         }
3800                 }
3801
3802 ## # check for blank lines before declarations
3803 ##              if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
3804 ##                  $prevrawline =~ /^.\s*$/) {
3805 ##                      WARN("SPACING",
3806 ##                           "No blank lines before declarations\n" . $hereprev);
3807 ##              }
3808 ##
3809
3810 # closing brace should have a space following it when it has anything
3811 # on the line
3812                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
3813                         if (ERROR("SPACING",
3814                                   "space required after that close brace '}'\n" . $herecurr) &&
3815                             $fix) {
3816                                 $fixed[$fixlinenr] =~
3817                                     s/}((?!(?:,|;|\)))\S)/} $1/;
3818                         }
3819                 }
3820
3821 # check spacing on square brackets
3822                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
3823                         if (ERROR("SPACING",
3824                                   "space prohibited after that open square bracket '['\n" . $herecurr) &&
3825                             $fix) {
3826                                 $fixed[$fixlinenr] =~
3827                                     s/\[\s+/\[/;
3828                         }
3829                 }
3830                 if ($line =~ /\s\]/) {
3831                         if (ERROR("SPACING",
3832                                   "space prohibited before that close square bracket ']'\n" . $herecurr) &&
3833                             $fix) {
3834                                 $fixed[$fixlinenr] =~
3835                                     s/\s+\]/\]/;
3836                         }
3837                 }
3838
3839 # check spacing on parentheses
3840                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
3841                     $line !~ /for\s*\(\s+;/) {
3842                         if (ERROR("SPACING",
3843                                   "space prohibited after that open parenthesis '('\n" . $herecurr) &&
3844                             $fix) {
3845                                 $fixed[$fixlinenr] =~
3846                                     s/\(\s+/\(/;
3847                         }
3848                 }
3849                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
3850                     $line !~ /for\s*\(.*;\s+\)/ &&
3851                     $line !~ /:\s+\)/) {
3852                         if (ERROR("SPACING",
3853                                   "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
3854                             $fix) {
3855                                 $fixed[$fixlinenr] =~
3856                                     s/\s+\)/\)/;
3857                         }
3858                 }
3859
3860 # check unnecessary parentheses around addressof/dereference single $Lvals
3861 # ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar
3862
3863                 while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
3864                         my $var = $1;
3865                         if (CHK("UNNECESSARY_PARENTHESES",
3866                                 "Unnecessary parentheses around $var\n" . $herecurr) &&
3867                             $fix) {
3868                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/;
3869                         }
3870                 }
3871
3872 # check for unnecessary parentheses around function pointer uses
3873 # ie: (foo->bar)(); should be foo->bar();
3874 # but not "if (foo->bar) (" to avoid some false positives
3875                 if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) {
3876                         my $var = $2;
3877                         if (CHK("UNNECESSARY_PARENTHESES",
3878                                 "Unnecessary parentheses around function pointer $var\n" . $herecurr) &&
3879                             $fix) {
3880                                 my $var2 = deparenthesize($var);
3881                                 $var2 =~ s/\s//g;
3882                                 $fixed[$fixlinenr] =~ s/\Q$var\E/$var2/;
3883                         }
3884                 }
3885
3886 #goto labels aren't indented, allow a single space however
3887                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
3888                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
3889                         if (WARN("INDENTED_LABEL",
3890                                  "labels should not be indented\n" . $herecurr) &&
3891                             $fix) {
3892                                 $fixed[$fixlinenr] =~
3893                                     s/^(.)\s+/$1/;
3894                         }
3895                 }
3896
3897 # return is not a function
3898                 if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
3899                         my $spacing = $1;
3900                         if ($^V && $^V ge 5.10.0 &&
3901                             $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
3902                                 my $value = $1;
3903                                 $value = deparenthesize($value);
3904                                 if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
3905                                         ERROR("RETURN_PARENTHESES",
3906                                               "return is not a function, parentheses are not required\n" . $herecurr);
3907                                 }
3908                         } elsif ($spacing !~ /\s+/) {
3909                                 ERROR("SPACING",
3910                                       "space required before the open parenthesis '('\n" . $herecurr);
3911                         }
3912                 }
3913
3914 # unnecessary return in a void function
3915 # at end-of-function, with the previous line a single leading tab, then return;
3916 # and the line before that not a goto label target like "out:"
3917                 if ($sline =~ /^[ \+]}\s*$/ &&
3918                     $prevline =~ /^\+\treturn\s*;\s*$/ &&
3919                     $linenr >= 3 &&
3920                     $lines[$linenr - 3] =~ /^[ +]/ &&
3921                     $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
3922                         WARN("RETURN_VOID",
3923                              "void function return statements are not generally useful\n" . $hereprev);
3924                }
3925
3926 # if statements using unnecessary parentheses - ie: if ((foo == bar))
3927                 if ($^V && $^V ge 5.10.0 &&
3928                     $line =~ /\bif\s*((?:\(\s*){2,})/) {
3929                         my $openparens = $1;
3930                         my $count = $openparens =~ tr@\(@\(@;
3931                         my $msg = "";
3932                         if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
3933                                 my $comp = $4;  #Not $1 because of $LvalOrFunc
3934                                 $msg = " - maybe == should be = ?" if ($comp eq "==");
3935                                 WARN("UNNECESSARY_PARENTHESES",
3936                                      "Unnecessary parentheses$msg\n" . $herecurr);
3937                         }
3938                 }
3939
3940 # Return of what appears to be an errno should normally be -'ve
3941                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
3942                         my $name = $1;
3943                         if ($name ne 'EOF' && $name ne 'ERROR') {
3944                                 WARN("USE_NEGATIVE_ERRNO",
3945                                      "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
3946                         }
3947                 }
3948
3949 # Need a space before open parenthesis after if, while etc
3950                 if ($line =~ /\b(if|while|for|switch)\(/) {
3951                         if (ERROR("SPACING",
3952                                   "space required before the open parenthesis '('\n" . $herecurr) &&
3953                             $fix) {
3954                                 $fixed[$fixlinenr] =~
3955                                     s/\b(if|while|for|switch)\(/$1 \(/;
3956                         }
3957                 }
3958
3959 # Check for illegal assignment in if conditional -- and check for trailing
3960 # statements after the conditional.
3961                 if ($line =~ /do\s*(?!{)/) {
3962                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
3963                                 ctx_statement_block($linenr, $realcnt, 0)
3964                                         if (!defined $stat);
3965                         my ($stat_next) = ctx_statement_block($line_nr_next,
3966                                                 $remain_next, $off_next);
3967                         $stat_next =~ s/\n./\n /g;
3968                         ##print "stat<$stat> stat_next<$stat_next>\n";
3969
3970                         if ($stat_next =~ /^\s*while\b/) {
3971                                 # If the statement carries leading newlines,
3972                                 # then count those as offsets.
3973                                 my ($whitespace) =
3974                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
3975                                 my $offset =
3976                                         statement_rawlines($whitespace) - 1;
3977
3978                                 $suppress_whiletrailers{$line_nr_next +
3979                                                                 $offset} = 1;
3980                         }
3981                 }
3982                 if (!defined $suppress_whiletrailers{$linenr} &&
3983                     defined($stat) && defined($cond) &&
3984                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
3985                         my ($s, $c) = ($stat, $cond);
3986
3987                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
3988                                 ERROR("ASSIGN_IN_IF",
3989                                       "do not use assignment in if condition\n" . $herecurr);
3990                         }
3991
3992                         # Find out what is on the end of the line after the
3993                         # conditional.
3994                         substr($s, 0, length($c), '');
3995                         $s =~ s/\n.*//g;
3996                         $s =~ s/$;//g;  # Remove any comments
3997                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
3998                             $c !~ /}\s*while\s*/)
3999                         {
4000                                 # Find out how long the conditional actually is.
4001                                 my @newlines = ($c =~ /\n/gs);
4002                                 my $cond_lines = 1 + $#newlines;
4003                                 my $stat_real = '';
4004
4005                                 $stat_real = raw_line($linenr, $cond_lines)
4006                                                         . "\n" if ($cond_lines);
4007                                 if (defined($stat_real) && $cond_lines > 1) {
4008                                         $stat_real = "[...]\n$stat_real";
4009                                 }
4010
4011                                 ERROR("TRAILING_STATEMENTS",
4012                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
4013                         }
4014                 }
4015
4016 # Check for bitwise tests written as boolean
4017                 if ($line =~ /
4018                         (?:
4019                                 (?:\[|\(|\&\&|\|\|)
4020                                 \s*0[xX][0-9]+\s*
4021                                 (?:\&\&|\|\|)
4022                         |
4023                                 (?:\&\&|\|\|)
4024                                 \s*0[xX][0-9]+\s*
4025                                 (?:\&\&|\|\||\)|\])
4026                         )/x)
4027                 {
4028                         WARN("HEXADECIMAL_BOOLEAN_TEST",
4029                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
4030                 }
4031
4032 # if and else should not have general statements after it
4033                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
4034                         my $s = $1;
4035                         $s =~ s/$;//g;  # Remove any comments
4036                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
4037                                 ERROR("TRAILING_STATEMENTS",
4038                                       "trailing statements should be on next line\n" . $herecurr);
4039                         }
4040                 }
4041 # if should not continue a brace
4042                 if ($line =~ /}\s*if\b/) {
4043                         ERROR("TRAILING_STATEMENTS",
4044                               "trailing statements should be on next line (or did you mean 'else if'?)\n" .
4045                                 $herecurr);
4046                 }
4047 # case and default should not have general statements after them
4048                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
4049                     $line !~ /\G(?:
4050                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
4051                         \s*return\s+
4052                     )/xg)
4053                 {
4054                         ERROR("TRAILING_STATEMENTS",
4055                               "trailing statements should be on next line\n" . $herecurr);
4056                 }
4057
4058                 # Check for }<nl>else {, these must be at the same
4059                 # indent level to be relevant to each other.
4060                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ &&
4061                     $previndent == $indent) {
4062                         if (ERROR("ELSE_AFTER_BRACE",
4063                                   "else should follow close brace '}'\n" . $hereprev) &&
4064                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4065                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4066                                 fix_delete_line($fixlinenr, $rawline);
4067                                 my $fixedline = $prevrawline;
4068                                 $fixedline =~ s/}\s*$//;
4069                                 if ($fixedline !~ /^\+\s*$/) {
4070                                         fix_insert_line($fixlinenr, $fixedline);
4071                                 }
4072                                 $fixedline = $rawline;
4073                                 $fixedline =~ s/^(.\s*)else/$1} else/;
4074                                 fix_insert_line($fixlinenr, $fixedline);
4075                         }
4076                 }
4077
4078                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ &&
4079                     $previndent == $indent) {
4080                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
4081
4082                         # Find out what is on the end of the line after the
4083                         # conditional.
4084                         substr($s, 0, length($c), '');
4085                         $s =~ s/\n.*//g;
4086
4087                         if ($s =~ /^\s*;/) {
4088                                 if (ERROR("WHILE_AFTER_BRACE",
4089                                           "while should follow close brace '}'\n" . $hereprev) &&
4090                                     $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4091                                         fix_delete_line($fixlinenr - 1, $prevrawline);
4092                                         fix_delete_line($fixlinenr, $rawline);
4093                                         my $fixedline = $prevrawline;
4094                                         my $trailing = $rawline;
4095                                         $trailing =~ s/^\+//;
4096                                         $trailing = trim($trailing);
4097                                         $fixedline =~ s/}\s*$/} $trailing/;
4098                                         fix_insert_line($fixlinenr, $fixedline);
4099                                 }
4100                         }
4101                 }
4102
4103 #Specific variable tests
4104                 while ($line =~ m{($Constant|$Lval)}g) {
4105                         my $var = $1;
4106
4107 #gcc binary extension
4108                         if ($var =~ /^$Binary$/) {
4109                                 if (WARN("GCC_BINARY_CONSTANT",
4110                                          "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
4111                                     $fix) {
4112                                         my $hexval = sprintf("0x%x", oct($var));
4113                                         $fixed[$fixlinenr] =~
4114                                             s/\b$var\b/$hexval/;
4115                                 }
4116                         }
4117
4118 #CamelCase
4119                         if ($var !~ /^$Constant$/ &&
4120                             $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
4121 #Ignore Page<foo> variants
4122                             $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
4123 #Ignore SI style variants like nS, mV and dB (ie: max_uV, regulator_min_uA_show)
4124                             $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/ &&
4125 #Ignore some three character SI units explicitly, like MiB and KHz
4126                             $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
4127                                 while ($var =~ m{($Ident)}g) {
4128                                         my $word = $1;
4129                                         next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
4130                                         if ($check) {
4131                                                 seed_camelcase_includes();
4132                                                 if (!$file && !$camelcase_file_seeded) {
4133                                                         seed_camelcase_file($realfile);
4134                                                         $camelcase_file_seeded = 1;
4135                                                 }
4136                                         }
4137                                         if (!defined $camelcase{$word}) {
4138                                                 $camelcase{$word} = 1;
4139                                                 CHK("CAMELCASE",
4140                                                     "Avoid CamelCase: <$word>\n" . $herecurr);
4141                                         }
4142                                 }
4143                         }
4144                 }
4145
4146 #no spaces allowed after \ in define
4147                 if ($line =~ /\#\s*define.*\\\s+$/) {
4148                         if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
4149                                  "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
4150                             $fix) {
4151                                 $fixed[$fixlinenr] =~ s/\s+$//;
4152                         }
4153                 }
4154
4155 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
4156                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
4157                         my $file = "$1.h";
4158                         my $checkfile = "include/linux/$file";
4159                         if (-f "$root/$checkfile" &&
4160                             $realfile ne $checkfile &&
4161                             $1 !~ /$allowed_asm_includes/)
4162                         {
4163                                 if ($realfile =~ m{^arch/}) {
4164                                         CHK("ARCH_INCLUDE_LINUX",
4165                                             "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
4166                                 } else {
4167                                         WARN("INCLUDE_LINUX",
4168                                              "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
4169                                 }
4170                         }
4171                 }
4172
4173 # multi-statement macros should be enclosed in a do while loop, grab the
4174 # first statement and ensure its the whole macro if its not enclosed
4175 # in a known good container
4176                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
4177                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
4178                         my $ln = $linenr;
4179                         my $cnt = $realcnt;
4180                         my ($off, $dstat, $dcond, $rest);
4181                         my $ctx = '';
4182                         my $has_flow_statement = 0;
4183                         my $has_arg_concat = 0;
4184                         ($dstat, $dcond, $ln, $cnt, $off) =
4185                                 ctx_statement_block($linenr, $realcnt, 0);
4186                         $ctx = $dstat;
4187                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
4188                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
4189
4190                         $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
4191                         $has_arg_concat = 1 if ($ctx =~ /\#\#/);
4192
4193                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
4194                         $dstat =~ s/$;//g;
4195                         $dstat =~ s/\\\n.//g;
4196                         $dstat =~ s/^\s*//s;
4197                         $dstat =~ s/\s*$//s;
4198
4199                         # Flatten any parentheses and braces
4200                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
4201                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
4202                                $dstat =~ s/\[[^\[\]]*\]/1/)
4203                         {
4204                         }
4205
4206                         # Flatten any obvious string concatentation.
4207                         while ($dstat =~ s/("X*")\s*$Ident/$1/ ||
4208                                $dstat =~ s/$Ident\s*("X*")/$1/)
4209                         {
4210                         }
4211
4212                         my $exceptions = qr{
4213                                 $Declare|
4214                                 module_param_named|
4215                                 MODULE_PARM_DESC|
4216                                 DECLARE_PER_CPU|
4217                                 DEFINE_PER_CPU|
4218                                 __typeof__\(|
4219                                 union|
4220                                 struct|
4221                                 \.$Ident\s*=\s*|
4222                                 ^\"|\"$
4223                         }x;
4224                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
4225                         if ($dstat ne '' &&
4226                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
4227                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
4228                             $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&          # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
4229                             $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ &&                  # character constants
4230                             $dstat !~ /$exceptions/ &&
4231                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
4232                             $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&          # stringification #foo
4233                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
4234                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
4235                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
4236                             $dstat !~ /^do\s*{/ &&                                      # do {...
4237                             $dstat !~ /^\({/ &&                                         # ({...
4238                             $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
4239                         {
4240                                 $ctx =~ s/\n*$//;
4241                                 my $herectx = $here . "\n";
4242                                 my $cnt = statement_rawlines($ctx);
4243
4244                                 for (my $n = 0; $n < $cnt; $n++) {
4245                                         $herectx .= raw_line($linenr, $n) . "\n";
4246                                 }
4247
4248                                 if ($dstat =~ /;/) {
4249                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
4250                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
4251                                 } else {
4252                                         ERROR("COMPLEX_MACRO",
4253                                               "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
4254                                 }
4255                         }
4256
4257 # check for macros with flow control, but without ## concatenation
4258 # ## concatenation is commonly a macro that defines a function so ignore those
4259                         if ($has_flow_statement && !$has_arg_concat) {
4260                                 my $herectx = $here . "\n";
4261                                 my $cnt = statement_rawlines($ctx);
4262
4263                                 for (my $n = 0; $n < $cnt; $n++) {
4264                                         $herectx .= raw_line($linenr, $n) . "\n";
4265                                 }
4266                                 WARN("MACRO_WITH_FLOW_CONTROL",
4267                                      "Macros with flow control statements should be avoided\n" . "$herectx");
4268                         }
4269
4270 # check for line continuations outside of #defines, preprocessor #, and asm
4271
4272                 } else {
4273                         if ($prevline !~ /^..*\\$/ &&
4274                             $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
4275                             $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
4276                             $line =~ /^\+.*\\$/) {
4277                                 WARN("LINE_CONTINUATIONS",
4278                                      "Avoid unnecessary line continuations\n" . $herecurr);
4279                         }
4280                 }
4281
4282 # do {} while (0) macro tests:
4283 # single-statement macros do not need to be enclosed in do while (0) loop,
4284 # macro should not end with a semicolon
4285                 if ($^V && $^V ge 5.10.0 &&
4286                     $realfile !~ m@/vmlinux.lds.h$@ &&
4287                     $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
4288                         my $ln = $linenr;
4289                         my $cnt = $realcnt;
4290                         my ($off, $dstat, $dcond, $rest);
4291                         my $ctx = '';
4292                         ($dstat, $dcond, $ln, $cnt, $off) =
4293                                 ctx_statement_block($linenr, $realcnt, 0);
4294                         $ctx = $dstat;
4295
4296                         $dstat =~ s/\\\n.//g;
4297                         $dstat =~ s/$;/ /g;
4298
4299                         if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
4300                                 my $stmts = $2;
4301                                 my $semis = $3;
4302
4303                                 $ctx =~ s/\n*$//;
4304                                 my $cnt = statement_rawlines($ctx);
4305                                 my $herectx = $here . "\n";
4306
4307                                 for (my $n = 0; $n < $cnt; $n++) {
4308                                         $herectx .= raw_line($linenr, $n) . "\n";
4309                                 }
4310
4311                                 if (($stmts =~ tr/;/;/) == 1 &&
4312                                     $stmts !~ /^\s*(if|while|for|switch)\b/) {
4313                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
4314                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
4315                                 }
4316                                 if (defined $semis && $semis ne "") {
4317                                         WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
4318                                              "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
4319                                 }
4320                         } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
4321                                 $ctx =~ s/\n*$//;
4322                                 my $cnt = statement_rawlines($ctx);
4323                                 my $herectx = $here . "\n";
4324
4325                                 for (my $n = 0; $n < $cnt; $n++) {
4326                                         $herectx .= raw_line($linenr, $n) . "\n";
4327                                 }
4328
4329                                 WARN("TRAILING_SEMICOLON",
4330                                      "macros should not use a trailing semicolon\n" . "$herectx");
4331                         }
4332                 }
4333
4334 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
4335 # all assignments may have only one of the following with an assignment:
4336 #       .
4337 #       ALIGN(...)
4338 #       VMLINUX_SYMBOL(...)
4339                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
4340                         WARN("MISSING_VMLINUX_SYMBOL",
4341                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
4342                 }
4343
4344 # check for redundant bracing round if etc
4345                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
4346                         my ($level, $endln, @chunks) =
4347                                 ctx_statement_full($linenr, $realcnt, 1);
4348                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
4349                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
4350                         if ($#chunks > 0 && $level == 0) {
4351                                 my @allowed = ();
4352                                 my $allow = 0;
4353                                 my $seen = 0;
4354                                 my $herectx = $here . "\n";
4355                                 my $ln = $linenr - 1;
4356                                 for my $chunk (@chunks) {
4357                                         my ($cond, $block) = @{$chunk};
4358
4359                                         # If the condition carries leading newlines, then count those as offsets.
4360                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
4361                                         my $offset = statement_rawlines($whitespace) - 1;
4362
4363                                         $allowed[$allow] = 0;
4364                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
4365
4366                                         # We have looked at and allowed this specific line.
4367                                         $suppress_ifbraces{$ln + $offset} = 1;
4368
4369                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
4370                                         $ln += statement_rawlines($block) - 1;
4371
4372                                         substr($block, 0, length($cond), '');
4373
4374                                         $seen++ if ($block =~ /^\s*{/);
4375
4376                                         #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
4377                                         if (statement_lines($cond) > 1) {
4378                                                 #print "APW: ALLOWED: cond<$cond>\n";
4379                                                 $allowed[$allow] = 1;
4380                                         }
4381                                         if ($block =~/\b(?:if|for|while)\b/) {
4382                                                 #print "APW: ALLOWED: block<$block>\n";
4383                                                 $allowed[$allow] = 1;
4384                                         }
4385                                         if (statement_block_size($block) > 1) {
4386                                                 #print "APW: ALLOWED: lines block<$block>\n";
4387                                                 $allowed[$allow] = 1;
4388                                         }
4389                                         $allow++;
4390                                 }
4391                                 if ($seen) {
4392                                         my $sum_allowed = 0;
4393                                         foreach (@allowed) {
4394                                                 $sum_allowed += $_;
4395                                         }
4396                                         if ($sum_allowed == 0) {
4397                                                 WARN("BRACES",
4398                                                      "braces {} are not necessary for any arm of this statement\n" . $herectx);
4399                                         } elsif ($sum_allowed != $allow &&
4400                                                  $seen != $allow) {
4401                                                 CHK("BRACES",
4402                                                     "braces {} should be used on all arms of this statement\n" . $herectx);
4403                                         }
4404                                 }
4405                         }
4406                 }
4407                 if (!defined $suppress_ifbraces{$linenr - 1} &&
4408                                         $line =~ /\b(if|while|for|else)\b/) {
4409                         my $allowed = 0;
4410
4411                         # Check the pre-context.
4412                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
4413                                 #print "APW: ALLOWED: pre<$1>\n";
4414                                 $allowed = 1;
4415                         }
4416
4417                         my ($level, $endln, @chunks) =
4418                                 ctx_statement_full($linenr, $realcnt, $-[0]);
4419
4420                         # Check the condition.
4421                         my ($cond, $block) = @{$chunks[0]};
4422                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
4423                         if (defined $cond) {
4424                                 substr($block, 0, length($cond), '');
4425                         }
4426                         if (statement_lines($cond) > 1) {
4427                                 #print "APW: ALLOWED: cond<$cond>\n";
4428                                 $allowed = 1;
4429                         }
4430                         if ($block =~/\b(?:if|for|while)\b/) {
4431                                 #print "APW: ALLOWED: block<$block>\n";
4432                                 $allowed = 1;
4433                         }
4434                         if (statement_block_size($block) > 1) {
4435                                 #print "APW: ALLOWED: lines block<$block>\n";
4436                                 $allowed = 1;
4437                         }
4438                         # Check the post-context.
4439                         if (defined $chunks[1]) {
4440                                 my ($cond, $block) = @{$chunks[1]};
4441                                 if (defined $cond) {
4442                                         substr($block, 0, length($cond), '');
4443                                 }
4444                                 if ($block =~ /^\s*\{/) {
4445                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
4446                                         $allowed = 1;
4447                                 }
4448                         }
4449                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
4450                                 my $herectx = $here . "\n";
4451                                 my $cnt = statement_rawlines($block);
4452
4453                                 for (my $n = 0; $n < $cnt; $n++) {
4454                                         $herectx .= raw_line($linenr, $n) . "\n";
4455                                 }
4456
4457                                 WARN("BRACES",
4458                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
4459                         }
4460                 }
4461
4462 # check for unnecessary blank lines around braces
4463                 if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
4464                         CHK("BRACES",
4465                             "Blank lines aren't necessary before a close brace '}'\n" . $hereprev);
4466                 }
4467                 if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
4468                         CHK("BRACES",
4469                             "Blank lines aren't necessary after an open brace '{'\n" . $hereprev);
4470                 }
4471
4472 # no volatiles please
4473                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
4474                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
4475                         WARN("VOLATILE",
4476                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
4477                 }
4478
4479 # Check for user-visible strings broken across lines, which breaks the ability
4480 # to grep for the string.  Make exceptions when the previous string ends in a
4481 # newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
4482 # (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
4483                 if ($line =~ /^\+\s*"[X\t]*"/ &&
4484                     $prevline =~ /"\s*$/ &&
4485                     $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
4486                         if (WARN("SPLIT_STRING",
4487                                  "quoted string split across lines\n" . $hereprev) &&
4488                                      $fix &&
4489                                      $prevrawline =~ /^\+.*"\s*$/ &&
4490                                      $last_coalesced_string_linenr != $linenr - 1) {
4491                                 my $extracted_string = get_quoted_string($line, $rawline);
4492                                 my $comma_close = "";
4493                                 if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
4494                                         $comma_close = $1;
4495                                 }
4496
4497                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4498                                 fix_delete_line($fixlinenr, $rawline);
4499                                 my $fixedline = $prevrawline;
4500                                 $fixedline =~ s/"\s*$//;
4501                                 $fixedline .= substr($extracted_string, 1) . trim($comma_close);
4502                                 fix_insert_line($fixlinenr - 1, $fixedline);
4503                                 $fixedline = $rawline;
4504                                 $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
4505                                 if ($fixedline !~ /\+\s*$/) {
4506                                         fix_insert_line($fixlinenr, $fixedline);
4507                                 }
4508                                 $last_coalesced_string_linenr = $linenr;
4509                         }
4510                 }
4511
4512 # check for missing a space in a string concatenation
4513                 if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
4514                         WARN('MISSING_SPACE',
4515                              "break quoted strings at a space character\n" . $hereprev);
4516                 }
4517
4518 # check for spaces before a quoted newline
4519                 if ($rawline =~ /^.*\".*\s\\n/) {
4520                         if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
4521                                  "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
4522                             $fix) {
4523                                 $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
4524                         }
4525
4526                 }
4527
4528 # concatenated string without spaces between elements
4529                 if ($line =~ /"X+"[A-Z_]+/ || $line =~ /[A-Z_]+"X+"/) {
4530                         CHK("CONCATENATED_STRING",
4531                             "Concatenated strings should use spaces between elements\n" . $herecurr);
4532                 }
4533
4534 # uncoalesced string fragments
4535                 if ($line =~ /"X*"\s*"/) {
4536                         WARN("STRING_FRAGMENTS",
4537                              "Consecutive strings are generally better as a single string\n" . $herecurr);
4538                 }
4539
4540 # check for %L{u,d,i} in strings
4541                 my $string;
4542                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
4543                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
4544                         $string =~ s/%%/__/g;
4545                         if ($string =~ /(?<!%)%L[udi]/) {
4546                                 WARN("PRINTF_L",
4547                                      "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
4548                                 last;
4549                         }
4550                 }
4551
4552 # check for line continuations in quoted strings with odd counts of "
4553                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
4554                         WARN("LINE_CONTINUATIONS",
4555                              "Avoid line continuations in quoted strings\n" . $herecurr);
4556                 }
4557
4558 # warn about #if 0
4559                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
4560                         CHK("REDUNDANT_CODE",
4561                             "if this code is redundant consider removing it\n" .
4562                                 $herecurr);
4563                 }
4564
4565 # check for needless "if (<foo>) fn(<foo>)" uses
4566                 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
4567                         my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
4568                         if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
4569                                 WARN('NEEDLESS_IF',
4570                                      "$1(NULL) is safe and this check is probably not required\n" . $hereprev);
4571                         }
4572                 }
4573
4574 # check for unnecessary "Out of Memory" messages
4575                 if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
4576                     $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&
4577                     (defined $1 || defined $3) &&
4578                     $linenr > 3) {
4579                         my $testval = $2;
4580                         my $testline = $lines[$linenr - 3];
4581
4582                         my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
4583 #                       print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
4584
4585                         if ($c =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|(?:dev_)?alloc_skb)/) {
4586                                 WARN("OOM_MESSAGE",
4587                                      "Possible unnecessary 'out of memory' message\n" . $hereprev);
4588                         }
4589                 }
4590
4591 # check for logging functions with KERN_<LEVEL>
4592                 if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
4593                     $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
4594                         my $level = $1;
4595                         if (WARN("UNNECESSARY_KERN_LEVEL",
4596                                  "Possible unnecessary $level\n" . $herecurr) &&
4597                             $fix) {
4598                                 $fixed[$fixlinenr] =~ s/\s*$level\s*//;
4599                         }
4600                 }
4601
4602 # check for mask then right shift without a parentheses
4603                 if ($^V && $^V ge 5.10.0 &&
4604                     $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
4605                     $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
4606                         WARN("MASK_THEN_SHIFT",
4607                              "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
4608                 }
4609
4610 # check for pointer comparisons to NULL
4611                 if ($^V && $^V ge 5.10.0) {
4612                         while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) {
4613                                 my $val = $1;
4614                                 my $equal = "!";
4615                                 $equal = "" if ($4 eq "!=");
4616                                 if (CHK("COMPARISON_TO_NULL",
4617                                         "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) &&
4618                                             $fix) {
4619                                         $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/;
4620                                 }
4621                         }
4622                 }
4623
4624 # check for bad placement of section $InitAttribute (e.g.: __initdata)
4625                 if ($line =~ /(\b$InitAttribute\b)/) {
4626                         my $attr = $1;
4627                         if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
4628                                 my $ptr = $1;
4629                                 my $var = $2;
4630                                 if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
4631                                       ERROR("MISPLACED_INIT",
4632                                             "$attr should be placed after $var\n" . $herecurr)) ||
4633                                      ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
4634                                       WARN("MISPLACED_INIT",
4635                                            "$attr should be placed after $var\n" . $herecurr))) &&
4636                                     $fix) {
4637                                         $fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
4638                                 }
4639                         }
4640                 }
4641
4642 # check for $InitAttributeData (ie: __initdata) with const
4643                 if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
4644                         my $attr = $1;
4645                         $attr =~ /($InitAttributePrefix)(.*)/;
4646                         my $attr_prefix = $1;
4647                         my $attr_type = $2;
4648                         if (ERROR("INIT_ATTRIBUTE",
4649                                   "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
4650                             $fix) {
4651                                 $fixed[$fixlinenr] =~
4652                                     s/$InitAttributeData/${attr_prefix}initconst/;
4653                         }
4654                 }
4655
4656 # check for $InitAttributeConst (ie: __initconst) without const
4657                 if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
4658                         my $attr = $1;
4659                         if (ERROR("INIT_ATTRIBUTE",
4660                                   "Use of $attr requires a separate use of const\n" . $herecurr) &&
4661                             $fix) {
4662                                 my $lead = $fixed[$fixlinenr] =~
4663                                     /(^\+\s*(?:static\s+))/;
4664                                 $lead = rtrim($1);
4665                                 $lead = "$lead " if ($lead !~ /^\+$/);
4666                                 $lead = "${lead}const ";
4667                                 $fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/;
4668                         }
4669                 }
4670
4671 # don't use __constant_<foo> functions outside of include/uapi/
4672                 if ($realfile !~ m@^include/uapi/@ &&
4673                     $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
4674                         my $constant_func = $1;
4675                         my $func = $constant_func;
4676                         $func =~ s/^__constant_//;
4677                         if (WARN("CONSTANT_CONVERSION",
4678                                  "$constant_func should be $func\n" . $herecurr) &&
4679                             $fix) {
4680                                 $fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g;
4681                         }
4682                 }
4683
4684 # prefer usleep_range over udelay
4685                 if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
4686                         my $delay = $1;
4687                         # ignore udelay's < 10, however
4688                         if (! ($delay < 10) ) {
4689                                 CHK("USLEEP_RANGE",
4690                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr);
4691                         }
4692                         if ($delay > 2000) {
4693                                 WARN("LONG_UDELAY",
4694                                      "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
4695                         }
4696                 }
4697
4698 # warn about unexpectedly long msleep's
4699                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
4700                         if ($1 < 20) {
4701                                 WARN("MSLEEP",
4702                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr);
4703                         }
4704                 }
4705
4706 # check for comparisons of jiffies
4707                 if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
4708                         WARN("JIFFIES_COMPARISON",
4709                              "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
4710                 }
4711
4712 # check for comparisons of get_jiffies_64()
4713                 if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
4714                         WARN("JIFFIES_COMPARISON",
4715                              "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
4716                 }
4717
4718 # warn about #ifdefs in C files
4719 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
4720 #                       print "#ifdef in C files should be avoided\n";
4721 #                       print "$herecurr";
4722 #                       $clean = 0;
4723 #               }
4724
4725 # warn about spacing in #ifdefs
4726                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
4727                         if (ERROR("SPACING",
4728                                   "exactly one space required after that #$1\n" . $herecurr) &&
4729                             $fix) {
4730                                 $fixed[$fixlinenr] =~
4731                                     s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
4732                         }
4733
4734                 }
4735
4736 # check for spinlock_t definitions without a comment.
4737                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
4738                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
4739                         my $which = $1;
4740                         if (!ctx_has_comment($first_line, $linenr)) {
4741                                 CHK("UNCOMMENTED_DEFINITION",
4742                                     "$1 definition without comment\n" . $herecurr);
4743                         }
4744                 }
4745 # check for memory barriers without a comment.
4746                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
4747                         if (!ctx_has_comment($first_line, $linenr)) {
4748                                 WARN("MEMORY_BARRIER",
4749                                      "memory barrier without comment\n" . $herecurr);
4750                         }
4751                 }
4752 # check of hardware specific defines
4753                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
4754                         CHK("ARCH_DEFINES",
4755                             "architecture specific defines should be avoided\n" .  $herecurr);
4756                 }
4757
4758 # Check that the storage class is at the beginning of a declaration
4759                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
4760                         WARN("STORAGE_CLASS",
4761                              "storage class should be at the beginning of the declaration\n" . $herecurr)
4762                 }
4763
4764 # check the location of the inline attribute, that it is between
4765 # storage class and type.
4766                 if ($line =~ /\b$Type\s+$Inline\b/ ||
4767                     $line =~ /\b$Inline\s+$Storage\b/) {
4768                         ERROR("INLINE_LOCATION",
4769                               "inline keyword should sit between storage class and type\n" . $herecurr);
4770                 }
4771
4772 # Check for __inline__ and __inline, prefer inline
4773                 if ($realfile !~ m@\binclude/uapi/@ &&
4774                     $line =~ /\b(__inline__|__inline)\b/) {
4775                         if (WARN("INLINE",
4776                                  "plain inline is preferred over $1\n" . $herecurr) &&
4777                             $fix) {
4778                                 $fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/;
4779
4780                         }
4781                 }
4782
4783 # Check for __attribute__ packed, prefer __packed
4784                 if ($realfile !~ m@\binclude/uapi/@ &&
4785                     $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
4786                         WARN("PREFER_PACKED",
4787                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
4788                 }
4789
4790 # Check for __attribute__ aligned, prefer __aligned
4791                 if ($realfile !~ m@\binclude/uapi/@ &&
4792                     $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
4793                         WARN("PREFER_ALIGNED",
4794                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
4795                 }
4796
4797 # Check for __attribute__ format(printf, prefer __printf
4798                 if ($realfile !~ m@\binclude/uapi/@ &&
4799                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
4800                         if (WARN("PREFER_PRINTF",
4801                                  "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
4802                             $fix) {
4803                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;
4804
4805                         }
4806                 }
4807
4808 # Check for __attribute__ format(scanf, prefer __scanf
4809                 if ($realfile !~ m@\binclude/uapi/@ &&
4810                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
4811                         if (WARN("PREFER_SCANF",
4812                                  "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
4813                             $fix) {
4814                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
4815                         }
4816                 }
4817
4818 # Check for __attribute__ weak, or __weak declarations (may have link issues)
4819                 if ($^V && $^V ge 5.10.0 &&
4820                     $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
4821                     ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
4822                      $line =~ /\b__weak\b/)) {
4823                         ERROR("WEAK_DECLARATION",
4824                               "Using weak declarations can have unintended link defects\n" . $herecurr);
4825                 }
4826
4827 # check for sizeof(&)
4828                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
4829                         WARN("SIZEOF_ADDRESS",
4830                              "sizeof(& should be avoided\n" . $herecurr);
4831                 }
4832
4833 # check for sizeof without parenthesis
4834                 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
4835                         if (WARN("SIZEOF_PARENTHESIS",
4836                                  "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
4837                             $fix) {
4838                                 $fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
4839                         }
4840                 }
4841
4842 # check for struct spinlock declarations
4843                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
4844                         WARN("USE_SPINLOCK_T",
4845                              "struct spinlock should be spinlock_t\n" . $herecurr);
4846                 }
4847
4848 # check for seq_printf uses that could be seq_puts
4849                 if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
4850                         my $fmt = get_quoted_string($line, $rawline);
4851                         if ($fmt ne "" && $fmt !~ /[^\\]\%/) {
4852                                 if (WARN("PREFER_SEQ_PUTS",
4853                                          "Prefer seq_puts to seq_printf\n" . $herecurr) &&
4854                                     $fix) {
4855                                         $fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/;
4856                                 }
4857                         }
4858                 }
4859
4860 # Check for misused memsets
4861                 if ($^V && $^V ge 5.10.0 &&
4862                     defined $stat &&
4863                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
4864
4865                         my $ms_addr = $2;
4866                         my $ms_val = $7;
4867                         my $ms_size = $12;
4868
4869                         if ($ms_size =~ /^(0x|)0$/i) {
4870                                 ERROR("MEMSET",
4871                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
4872                         } elsif ($ms_size =~ /^(0x|)1$/i) {
4873                                 WARN("MEMSET",
4874                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
4875                         }
4876                 }
4877
4878 # Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
4879                 if ($^V && $^V ge 5.10.0 &&
4880                     $line =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/s) {
4881                         if (WARN("PREFER_ETHER_ADDR_COPY",
4882                                  "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . $herecurr) &&
4883                             $fix) {
4884                                 $fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
4885                         }
4886                 }
4887
4888 # typecasts on min/max could be min_t/max_t
4889                 if ($^V && $^V ge 5.10.0 &&
4890                     defined $stat &&
4891                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
4892                         if (defined $2 || defined $7) {
4893                                 my $call = $1;
4894                                 my $cast1 = deparenthesize($2);
4895                                 my $arg1 = $3;
4896                                 my $cast2 = deparenthesize($7);
4897                                 my $arg2 = $8;
4898                                 my $cast;
4899
4900                                 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
4901                                         $cast = "$cast1 or $cast2";
4902                                 } elsif ($cast1 ne "") {
4903                                         $cast = $cast1;
4904                                 } else {
4905                                         $cast = $cast2;
4906                                 }
4907                                 WARN("MINMAX",
4908                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
4909                         }
4910                 }
4911
4912 # check usleep_range arguments
4913                 if ($^V && $^V ge 5.10.0 &&
4914                     defined $stat &&
4915                     $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
4916                         my $min = $1;
4917                         my $max = $7;
4918                         if ($min eq $max) {
4919                                 WARN("USLEEP_RANGE",
4920                                      "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
4921                         } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
4922                                  $min > $max) {
4923                                 WARN("USLEEP_RANGE",
4924                                      "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
4925                         }
4926                 }
4927
4928 # check for naked sscanf
4929                 if ($^V && $^V ge 5.10.0 &&
4930                     defined $stat &&
4931                     $line =~ /\bsscanf\b/ &&
4932                     ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
4933                      $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
4934                      $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
4935                         my $lc = $stat =~ tr@\n@@;
4936                         $lc = $lc + $linenr;
4937                         my $stat_real = raw_line($linenr, 0);
4938                         for (my $count = $linenr + 1; $count <= $lc; $count++) {
4939                                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
4940                         }
4941                         WARN("NAKED_SSCANF",
4942                              "unchecked sscanf return value\n" . "$here\n$stat_real\n");
4943                 }
4944
4945 # check for simple sscanf that should be kstrto<foo>
4946                 if ($^V && $^V ge 5.10.0 &&
4947                     defined $stat &&
4948                     $line =~ /\bsscanf\b/) {
4949                         my $lc = $stat =~ tr@\n@@;
4950                         $lc = $lc + $linenr;
4951                         my $stat_real = raw_line($linenr, 0);
4952                         for (my $count = $linenr + 1; $count <= $lc; $count++) {
4953                                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
4954                         }
4955                         if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) {
4956                                 my $format = $6;
4957                                 my $count = $format =~ tr@%@%@;
4958                                 if ($count == 1 &&
4959                                     $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) {
4960                                         WARN("SSCANF_TO_KSTRTO",
4961                                              "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n");
4962                                 }
4963                         }
4964                 }
4965
4966 # check for new externs in .h files.
4967                 if ($realfile =~ /\.h$/ &&
4968                     $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
4969                         if (CHK("AVOID_EXTERNS",
4970                                 "extern prototypes should be avoided in .h files\n" . $herecurr) &&
4971                             $fix) {
4972                                 $fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
4973                         }
4974                 }
4975
4976 # check for new externs in .c files.
4977                 if ($realfile =~ /\.c$/ && defined $stat &&
4978                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
4979                 {
4980                         my $function_name = $1;
4981                         my $paren_space = $2;
4982
4983                         my $s = $stat;
4984                         if (defined $cond) {
4985                                 substr($s, 0, length($cond), '');
4986                         }
4987                         if ($s =~ /^\s*;/ &&
4988                             $function_name ne 'uninitialized_var')
4989                         {
4990                                 WARN("AVOID_EXTERNS",
4991                                      "externs should be avoided in .c files\n" .  $herecurr);
4992                         }
4993
4994                         if ($paren_space =~ /\n/) {
4995                                 WARN("FUNCTION_ARGUMENTS",
4996                                      "arguments for function declarations should follow identifier\n" . $herecurr);
4997                         }
4998
4999                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
5000                     $stat =~ /^.\s*extern\s+/)
5001                 {
5002                         WARN("AVOID_EXTERNS",
5003                              "externs should be avoided in .c files\n" .  $herecurr);
5004                 }
5005
5006 # checks for new __setup's
5007                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
5008                         my $name = $1;
5009
5010                         if (!grep(/$name/, @setup_docs)) {
5011                                 CHK("UNDOCUMENTED_SETUP",
5012                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
5013                         }
5014                 }
5015
5016 # check for pointless casting of kmalloc return
5017                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
5018                         WARN("UNNECESSARY_CASTS",
5019                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
5020                 }
5021
5022 # alloc style
5023 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
5024                 if ($^V && $^V ge 5.10.0 &&
5025                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
5026                         CHK("ALLOC_SIZEOF_STRUCT",
5027                             "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
5028                 }
5029
5030 # check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
5031                 if ($^V && $^V ge 5.10.0 &&
5032                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
5033                         my $oldfunc = $3;
5034                         my $a1 = $4;
5035                         my $a2 = $10;
5036                         my $newfunc = "kmalloc_array";
5037                         $newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
5038                         my $r1 = $a1;
5039                         my $r2 = $a2;
5040                         if ($a1 =~ /^sizeof\s*\S/) {
5041                                 $r1 = $a2;
5042                                 $r2 = $a1;
5043                         }
5044                         if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
5045                             !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
5046                                 if (WARN("ALLOC_WITH_MULTIPLY",
5047                                          "Prefer $newfunc over $oldfunc with multiply\n" . $herecurr) &&
5048                                     $fix) {
5049                                         $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
5050
5051                                 }
5052                         }
5053                 }
5054
5055 # check for krealloc arg reuse
5056                 if ($^V && $^V ge 5.10.0 &&
5057                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
5058                         WARN("KREALLOC_ARG_REUSE",
5059                              "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
5060                 }
5061
5062 # check for alloc argument mismatch
5063                 if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
5064                         WARN("ALLOC_ARRAY_ARGS",
5065                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
5066                 }
5067
5068 # check for multiple semicolons
5069                 if ($line =~ /;\s*;\s*$/) {
5070                         if (WARN("ONE_SEMICOLON",
5071                                  "Statements terminations use 1 semicolon\n" . $herecurr) &&
5072                             $fix) {
5073                                 $fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g;
5074                         }
5075                 }
5076
5077 # check for #defines like: 1 << <digit> that could be BIT(digit)
5078                 if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
5079                         my $ull = "";
5080                         $ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
5081                         if (CHK("BIT_MACRO",
5082                                 "Prefer using the BIT$ull macro\n" . $herecurr) &&
5083                             $fix) {
5084                                 $fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
5085                         }
5086                 }
5087
5088 # check for case / default statements not preceded by break/fallthrough/switch
5089                 if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
5090                         my $has_break = 0;
5091                         my $has_statement = 0;
5092                         my $count = 0;
5093                         my $prevline = $linenr;
5094                         while ($prevline > 1 && ($file || $count < 3) && !$has_break) {
5095                                 $prevline--;
5096                                 my $rline = $rawlines[$prevline - 1];
5097                                 my $fline = $lines[$prevline - 1];
5098                                 last if ($fline =~ /^\@\@/);
5099                                 next if ($fline =~ /^\-/);
5100                                 next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
5101                                 $has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
5102                                 next if ($fline =~ /^.[\s$;]*$/);
5103                                 $has_statement = 1;
5104                                 $count++;
5105                                 $has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|return\b|goto\b|continue\b)/);
5106                         }
5107                         if (!$has_break && $has_statement) {
5108                                 WARN("MISSING_BREAK",
5109                                      "Possible switch case/default not preceeded by break or fallthrough comment\n" . $herecurr);
5110                         }
5111                 }
5112
5113 # check for switch/default statements without a break;
5114                 if ($^V && $^V ge 5.10.0 &&
5115                     defined $stat &&
5116                     $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
5117                         my $ctx = '';
5118                         my $herectx = $here . "\n";
5119                         my $cnt = statement_rawlines($stat);
5120                         for (my $n = 0; $n < $cnt; $n++) {
5121                                 $herectx .= raw_line($linenr, $n) . "\n";
5122                         }
5123                         WARN("DEFAULT_NO_BREAK",
5124                              "switch default: should use break\n" . $herectx);
5125                 }
5126
5127 # check for gcc specific __FUNCTION__
5128                 if ($line =~ /\b__FUNCTION__\b/) {
5129                         if (WARN("USE_FUNC",
5130                                  "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr) &&
5131                             $fix) {
5132                                 $fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g;
5133                         }
5134                 }
5135
5136 # check for uses of __DATE__, __TIME__, __TIMESTAMP__
5137                 while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
5138                         ERROR("DATE_TIME",
5139                               "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
5140                 }
5141
5142 # check for use of yield()
5143                 if ($line =~ /\byield\s*\(\s*\)/) {
5144                         WARN("YIELD",
5145                              "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
5146                 }
5147
5148 # check for comparisons against true and false
5149                 if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
5150                         my $lead = $1;
5151                         my $arg = $2;
5152                         my $test = $3;
5153                         my $otype = $4;
5154                         my $trail = $5;
5155                         my $op = "!";
5156
5157                         ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);
5158
5159                         my $type = lc($otype);
5160                         if ($type =~ /^(?:true|false)$/) {
5161                                 if (("$test" eq "==" && "$type" eq "true") ||
5162                                     ("$test" eq "!=" && "$type" eq "false")) {
5163                                         $op = "";
5164                                 }
5165
5166                                 CHK("BOOL_COMPARISON",
5167                                     "Using comparison to $otype is error prone\n" . $herecurr);
5168
5169 ## maybe suggesting a correct construct would better
5170 ##                                  "Using comparison to $otype is error prone.  Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr);
5171
5172                         }
5173                 }
5174
5175 # check for semaphores initialized locked
5176                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
5177                         WARN("CONSIDER_COMPLETION",
5178                              "consider using a completion\n" . $herecurr);
5179                 }
5180
5181 # recommend kstrto* over simple_strto* and strict_strto*
5182                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
5183                         WARN("CONSIDER_KSTRTO",
5184                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
5185                 }
5186
5187 # check for __initcall(), use device_initcall() explicitly or more appropriate function please
5188                 if ($line =~ /^.\s*__initcall\s*\(/) {
5189                         WARN("USE_DEVICE_INITCALL",
5190                              "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
5191                 }
5192
5193 # check for various ops structs, ensure they are const.
5194                 my $struct_ops = qr{acpi_dock_ops|
5195                                 address_space_operations|
5196                                 backlight_ops|
5197                                 block_device_operations|
5198                                 dentry_operations|
5199                                 dev_pm_ops|
5200                                 dma_map_ops|
5201                                 extent_io_ops|
5202                                 file_lock_operations|
5203                                 file_operations|
5204                                 hv_ops|
5205                                 ide_dma_ops|
5206                                 intel_dvo_dev_ops|
5207                                 item_operations|
5208                                 iwl_ops|
5209                                 kgdb_arch|
5210                                 kgdb_io|
5211                                 kset_uevent_ops|
5212                                 lock_manager_operations|
5213                                 microcode_ops|
5214                                 mtrr_ops|
5215                                 neigh_ops|
5216                                 nlmsvc_binding|
5217                                 pci_raw_ops|
5218                                 pipe_buf_operations|
5219                                 platform_hibernation_ops|
5220                                 platform_suspend_ops|
5221                                 proto_ops|
5222                                 rpc_pipe_ops|
5223                                 seq_operations|
5224                                 snd_ac97_build_ops|
5225                                 soc_pcmcia_socket_ops|
5226                                 stacktrace_ops|
5227                                 sysfs_ops|
5228                                 tty_operations|
5229                                 usb_mon_operations|
5230                                 wd_ops}x;
5231                 if ($line !~ /\bconst\b/ &&
5232                     $line =~ /\bstruct\s+($struct_ops)\b/) {
5233                         WARN("CONST_STRUCT",
5234                              "struct $1 should normally be const\n" .
5235                                 $herecurr);
5236                 }
5237
5238 # use of NR_CPUS is usually wrong
5239 # ignore definitions of NR_CPUS and usage to define arrays as likely right
5240                 if ($line =~ /\bNR_CPUS\b/ &&
5241                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
5242                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
5243                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
5244                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
5245                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
5246                 {
5247                         WARN("NR_CPUS",
5248                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
5249                 }
5250
5251 # Use of __ARCH_HAS_<FOO> or ARCH_HAVE_<BAR> is wrong.
5252                 if ($line =~ /\+\s*#\s*define\s+((?:__)?ARCH_(?:HAS|HAVE)\w*)\b/) {
5253                         ERROR("DEFINE_ARCH_HAS",
5254                               "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
5255                 }
5256
5257 # likely/unlikely comparisons similar to "(likely(foo) > 0)"
5258                 if ($^V && $^V ge 5.10.0 &&
5259                     $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
5260                         WARN("LIKELY_MISUSE",
5261                              "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
5262                 }
5263
5264 # whine mightly about in_atomic
5265                 if ($line =~ /\bin_atomic\s*\(/) {
5266                         if ($realfile =~ m@^drivers/@) {
5267                                 ERROR("IN_ATOMIC",
5268                                       "do not use in_atomic in drivers\n" . $herecurr);
5269                         } elsif ($realfile !~ m@^kernel/@) {
5270                                 WARN("IN_ATOMIC",
5271                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
5272                         }
5273                 }
5274
5275 # check for lockdep_set_novalidate_class
5276                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
5277                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
5278                         if ($realfile !~ m@^kernel/lockdep@ &&
5279                             $realfile !~ m@^include/linux/lockdep@ &&
5280                             $realfile !~ m@^drivers/base/core@) {
5281                                 ERROR("LOCKDEP",
5282                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
5283                         }
5284                 }
5285
5286                 if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
5287                     $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
5288                         WARN("EXPORTED_WORLD_WRITABLE",
5289                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
5290                 }
5291
5292 # Mode permission misuses where it seems decimal should be octal
5293 # This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
5294                 if ($^V && $^V ge 5.10.0 &&
5295                     $line =~ /$mode_perms_search/) {
5296                         foreach my $entry (@mode_permission_funcs) {
5297                                 my $func = $entry->[0];
5298                                 my $arg_pos = $entry->[1];
5299
5300                                 my $skip_args = "";
5301                                 if ($arg_pos > 1) {
5302                                         $arg_pos--;
5303                                         $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
5304                                 }
5305                                 my $test = "\\b$func\\s*\\(${skip_args}([\\d]+)\\s*[,\\)]";
5306                                 if ($line =~ /$test/) {
5307                                         my $val = $1;
5308                                         $val = $6 if ($skip_args ne "");
5309
5310                                         if ($val !~ /^0$/ &&
5311                                             (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
5312                                              length($val) ne 4)) {
5313                                                 ERROR("NON_OCTAL_PERMISSIONS",
5314                                                       "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
5315                                         } elsif ($val =~ /^$Octal$/ && (oct($val) & 02)) {
5316                                                 ERROR("EXPORTED_WORLD_WRITABLE",
5317                                                       "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
5318                                         }
5319                                 }
5320                         }
5321                 }
5322         }
5323
5324         # If we have no input at all, then there is nothing to report on
5325         # so just keep quiet.
5326         if ($#rawlines == -1) {
5327                 exit(0);
5328         }
5329
5330         # In mailback mode only produce a report in the negative, for
5331         # things that appear to be patches.
5332         if ($mailback && ($clean == 1 || !$is_patch)) {
5333                 exit(0);
5334         }
5335
5336         # This is not a patch, and we are are in 'no-patch' mode so
5337         # just keep quiet.
5338         if (!$chk_patch && !$is_patch) {
5339                 exit(0);
5340         }
5341
5342         if (!$is_patch) {
5343                 ERROR("NOT_UNIFIED_DIFF",
5344                       "Does not appear to be a unified-diff format patch\n");
5345         }
5346         if ($is_patch && $chk_signoff && $signoff == 0) {
5347                 ERROR("MISSING_SIGN_OFF",
5348                       "Missing Signed-off-by: line(s)\n");
5349         }
5350
5351         print report_dump();
5352         if ($summary && !($clean == 1 && $quiet == 1)) {
5353                 print "$filename " if ($summary_file);
5354                 print "total: $cnt_error errors, $cnt_warn warnings, " .
5355                         (($check)? "$cnt_chk checks, " : "") .
5356                         "$cnt_lines lines checked\n";
5357                 print "\n" if ($quiet == 0);
5358         }
5359
5360         if ($quiet == 0) {
5361
5362                 if ($^V lt 5.10.0) {
5363                         print("NOTE: perl $^V is not modern enough to detect all possible issues.\n");
5364                         print("An upgrade to at least perl v5.10.0 is suggested.\n\n");
5365                 }
5366
5367                 # If there were whitespace errors which cleanpatch can fix
5368                 # then suggest that.
5369                 if ($rpt_cleaners) {
5370                         print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
5371                         print "      scripts/cleanfile\n\n";
5372                         $rpt_cleaners = 0;
5373                 }
5374         }
5375
5376         hash_show_words(\%use_type, "Used");
5377         hash_show_words(\%ignore_type, "Ignored");
5378
5379         if ($clean == 0 && $fix &&
5380             ("@rawlines" ne "@fixed" ||
5381              $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) {
5382                 my $newfile = $filename;
5383                 $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
5384                 my $linecount = 0;
5385                 my $f;
5386
5387                 @fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted);
5388
5389                 open($f, '>', $newfile)
5390                     or die "$P: Can't open $newfile for write\n";
5391                 foreach my $fixed_line (@fixed) {
5392                         $linecount++;
5393                         if ($file) {
5394                                 if ($linecount > 3) {
5395                                         $fixed_line =~ s/^\+//;
5396                                         print $f $fixed_line . "\n";
5397                                 }
5398                         } else {
5399                                 print $f $fixed_line . "\n";
5400                         }
5401                 }
5402                 close($f);
5403
5404                 if (!$quiet) {
5405                         print << "EOM";
5406 Wrote EXPERIMENTAL --fix correction(s) to '$newfile'
5407
5408 Do _NOT_ trust the results written to this file.
5409 Do _NOT_ submit these changes without inspecting them for correctness.
5410
5411 This EXPERIMENTAL file is simply a convenience to help rewrite patches.
5412 No warranties, expressed or implied...
5413
5414 EOM
5415                 }
5416         }
5417
5418         if ($clean == 1 && $quiet == 0) {
5419                 print "$vname has no obvious style problems and is ready for submission.\n"
5420         }
5421         if ($clean == 0 && $quiet == 0) {
5422                 print << "EOM";
5423 $vname has style problems, please review.
5424
5425 If any of these errors are false positives, please report
5426 them to the maintainer, see CHECKPATCH in MAINTAINERS.
5427 EOM
5428         }
5429
5430         return $clean;
5431 }