checkstack: sort output by size and function name

Sort output by size and in addition by function name.  This increases
readability for cases where there are many functions with the same stack
usage.

Link: https://lkml.kernel.org/r/20231120183719.2188479-3-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Cc: Maninder Singh <maninder1.s@samsung.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Vaneet Narang <v.narang@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index f27d552aec43f2b41aacf195069510c3121be03b..13408714ba0f88794311b2b332e470870cba1ae7 100755 (executable)
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -189,5 +189,20 @@ if ($total_size > $min_stack) {
        push @stack, "$intro$total_size\n";
 }
 
-# Sort output by size (last field)
-print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
+# Sort output by size (last field) and function name if size is the same
+sub sort_lines {
+       my ($a, $b) = @_;
+
+       my $num_a = $1 if $a =~ /:\t*(\d+)$/;
+       my $num_b = $1 if $b =~ /:\t*(\d+)$/;
+       my $func_a = $1 if $a =~ / (.*):/;
+       my $func_b = $1 if $b =~ / (.*):/;
+
+       if ($num_a != $num_b) {
+               return $num_b <=> $num_a;
+       } else {
+               return $func_a cmp $func_b;
+       }
+}
+
+print sort { sort_lines($a, $b) } @stack;