| 1 | #ifndef _LINUX_KERNEL_H |
| 2 | #define _LINUX_KERNEL_H |
| 3 | |
| 4 | /* |
| 5 | * 'kernel.h' contains some often-used function prototypes etc |
| 6 | */ |
| 7 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) |
| 8 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) |
| 9 | |
| 10 | #ifdef __KERNEL__ |
| 11 | |
| 12 | #include <stdarg.h> |
| 13 | #include <linux/linkage.h> |
| 14 | #include <linux/stddef.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/compiler.h> |
| 17 | #include <linux/bitops.h> |
| 18 | #include <linux/log2.h> |
| 19 | #include <linux/typecheck.h> |
| 20 | #include <linux/printk.h> |
| 21 | #include <linux/dynamic_debug.h> |
| 22 | #include <asm/byteorder.h> |
| 23 | #include <asm/bug.h> |
| 24 | |
| 25 | #define USHRT_MAX ((u16)(~0U)) |
| 26 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) |
| 27 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) |
| 28 | #define INT_MAX ((int)(~0U>>1)) |
| 29 | #define INT_MIN (-INT_MAX - 1) |
| 30 | #define UINT_MAX (~0U) |
| 31 | #define LONG_MAX ((long)(~0UL>>1)) |
| 32 | #define LONG_MIN (-LONG_MAX - 1) |
| 33 | #define ULONG_MAX (~0UL) |
| 34 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
| 35 | #define LLONG_MIN (-LLONG_MAX - 1) |
| 36 | #define ULLONG_MAX (~0ULL) |
| 37 | |
| 38 | #define STACK_MAGIC 0xdeadbeef |
| 39 | |
| 40 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
| 41 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
| 42 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
| 43 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
| 44 | |
| 45 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
| 46 | |
| 47 | /* |
| 48 | * This looks more complex than it should be. But we need to |
| 49 | * get the type for the ~ right in round_down (it needs to be |
| 50 | * as wide as the result!), and we want to evaluate the macro |
| 51 | * arguments just once each. |
| 52 | */ |
| 53 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) |
| 54 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) |
| 55 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) |
| 56 | |
| 57 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
| 58 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
| 59 | #define roundup(x, y) ( \ |
| 60 | { \ |
| 61 | const typeof(y) __y = y; \ |
| 62 | (((x) + (__y - 1)) / __y) * __y; \ |
| 63 | } \ |
| 64 | ) |
| 65 | #define rounddown(x, y) ( \ |
| 66 | { \ |
| 67 | typeof(x) __x = (x); \ |
| 68 | __x - (__x % (y)); \ |
| 69 | } \ |
| 70 | ) |
| 71 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
| 72 | { \ |
| 73 | typeof(divisor) __divisor = divisor; \ |
| 74 | (((x) + ((__divisor) / 2)) / (__divisor)); \ |
| 75 | } \ |
| 76 | ) |
| 77 | |
| 78 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
| 79 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) |
| 80 | |
| 81 | #ifdef CONFIG_LBDAF |
| 82 | # include <asm/div64.h> |
| 83 | # define sector_div(a, b) do_div(a, b) |
| 84 | #else |
| 85 | # define sector_div(n, b)( \ |
| 86 | { \ |
| 87 | int _res; \ |
| 88 | _res = (n) % (b); \ |
| 89 | (n) /= (b); \ |
| 90 | _res; \ |
| 91 | } \ |
| 92 | ) |
| 93 | #endif |
| 94 | |
| 95 | /** |
| 96 | * upper_32_bits - return bits 32-63 of a number |
| 97 | * @n: the number we're accessing |
| 98 | * |
| 99 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
| 100 | * the "right shift count >= width of type" warning when that quantity is |
| 101 | * 32-bits. |
| 102 | */ |
| 103 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
| 104 | |
| 105 | /** |
| 106 | * lower_32_bits - return bits 0-31 of a number |
| 107 | * @n: the number we're accessing |
| 108 | */ |
| 109 | #define lower_32_bits(n) ((u32)(n)) |
| 110 | |
| 111 | struct completion; |
| 112 | struct pt_regs; |
| 113 | struct user; |
| 114 | |
| 115 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
| 116 | extern int _cond_resched(void); |
| 117 | # define might_resched() _cond_resched() |
| 118 | #else |
| 119 | # define might_resched() do { } while (0) |
| 120 | #endif |
| 121 | |
| 122 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
| 123 | void __might_sleep(const char *file, int line, int preempt_offset); |
| 124 | /** |
| 125 | * might_sleep - annotation for functions that can sleep |
| 126 | * |
| 127 | * this macro will print a stack trace if it is executed in an atomic |
| 128 | * context (spinlock, irq-handler, ...). |
| 129 | * |
| 130 | * This is a useful debugging help to be able to catch problems early and not |
| 131 | * be bitten later when the calling function happens to sleep when it is not |
| 132 | * supposed to. |
| 133 | */ |
| 134 | # define might_sleep() \ |
| 135 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
| 136 | #else |
| 137 | static inline void __might_sleep(const char *file, int line, |
| 138 | int preempt_offset) { } |
| 139 | # define might_sleep() do { might_resched(); } while (0) |
| 140 | #endif |
| 141 | |
| 142 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
| 143 | |
| 144 | #define abs(x) ({ \ |
| 145 | long __x = (x); \ |
| 146 | (__x < 0) ? -__x : __x; \ |
| 147 | }) |
| 148 | |
| 149 | #define abs64(x) ({ \ |
| 150 | s64 __x = (x); \ |
| 151 | (__x < 0) ? -__x : __x; \ |
| 152 | }) |
| 153 | |
| 154 | #ifdef CONFIG_PROVE_LOCKING |
| 155 | void might_fault(void); |
| 156 | #else |
| 157 | static inline void might_fault(void) |
| 158 | { |
| 159 | might_sleep(); |
| 160 | } |
| 161 | #endif |
| 162 | |
| 163 | extern struct atomic_notifier_head panic_notifier_list; |
| 164 | extern long (*panic_blink)(int state); |
| 165 | NORET_TYPE void panic(const char * fmt, ...) |
| 166 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
| 167 | extern void oops_enter(void); |
| 168 | extern void oops_exit(void); |
| 169 | void print_oops_end_marker(void); |
| 170 | extern int oops_may_print(void); |
| 171 | NORET_TYPE void do_exit(long error_code) |
| 172 | ATTRIB_NORET; |
| 173 | NORET_TYPE void complete_and_exit(struct completion *, long) |
| 174 | ATTRIB_NORET; |
| 175 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
| 176 | extern long simple_strtol(const char *,char **,unsigned int); |
| 177 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
| 178 | extern long long simple_strtoll(const char *,char **,unsigned int); |
| 179 | extern int __must_check strict_strtoul(const char *, unsigned int, unsigned long *); |
| 180 | extern int __must_check strict_strtol(const char *, unsigned int, long *); |
| 181 | extern int __must_check strict_strtoull(const char *, unsigned int, unsigned long long *); |
| 182 | extern int __must_check strict_strtoll(const char *, unsigned int, long long *); |
| 183 | extern int sprintf(char * buf, const char * fmt, ...) |
| 184 | __attribute__ ((format (printf, 2, 3))); |
| 185 | extern int vsprintf(char *buf, const char *, va_list) |
| 186 | __attribute__ ((format (printf, 2, 0))); |
| 187 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
| 188 | __attribute__ ((format (printf, 3, 4))); |
| 189 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 190 | __attribute__ ((format (printf, 3, 0))); |
| 191 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
| 192 | __attribute__ ((format (printf, 3, 4))); |
| 193 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 194 | __attribute__ ((format (printf, 3, 0))); |
| 195 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
| 196 | __attribute__ ((format (printf, 2, 3))); |
| 197 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
| 198 | |
| 199 | extern int sscanf(const char *, const char *, ...) |
| 200 | __attribute__ ((format (scanf, 2, 3))); |
| 201 | extern int vsscanf(const char *, const char *, va_list) |
| 202 | __attribute__ ((format (scanf, 2, 0))); |
| 203 | |
| 204 | extern int get_option(char **str, int *pint); |
| 205 | extern char *get_options(const char *str, int nints, int *ints); |
| 206 | extern unsigned long long memparse(const char *ptr, char **retptr); |
| 207 | |
| 208 | extern int core_kernel_text(unsigned long addr); |
| 209 | extern int __kernel_text_address(unsigned long addr); |
| 210 | extern int kernel_text_address(unsigned long addr); |
| 211 | extern int func_ptr_is_kernel_text(void *ptr); |
| 212 | |
| 213 | struct pid; |
| 214 | extern struct pid *session_of_pgrp(struct pid *pgrp); |
| 215 | |
| 216 | unsigned long int_sqrt(unsigned long); |
| 217 | |
| 218 | extern void bust_spinlocks(int yes); |
| 219 | extern void wake_up_klogd(void); |
| 220 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
| 221 | extern int panic_timeout; |
| 222 | extern int panic_on_oops; |
| 223 | extern int panic_on_unrecovered_nmi; |
| 224 | extern int panic_on_io_nmi; |
| 225 | extern const char *print_tainted(void); |
| 226 | extern void add_taint(unsigned flag); |
| 227 | extern int test_taint(unsigned flag); |
| 228 | extern unsigned long get_taint(void); |
| 229 | extern int root_mountflags; |
| 230 | |
| 231 | /* Values used for system_state */ |
| 232 | extern enum system_states { |
| 233 | SYSTEM_BOOTING, |
| 234 | SYSTEM_RUNNING, |
| 235 | SYSTEM_HALT, |
| 236 | SYSTEM_POWER_OFF, |
| 237 | SYSTEM_RESTART, |
| 238 | SYSTEM_SUSPEND_DISK, |
| 239 | } system_state; |
| 240 | |
| 241 | #define TAINT_PROPRIETARY_MODULE 0 |
| 242 | #define TAINT_FORCED_MODULE 1 |
| 243 | #define TAINT_UNSAFE_SMP 2 |
| 244 | #define TAINT_FORCED_RMMOD 3 |
| 245 | #define TAINT_MACHINE_CHECK 4 |
| 246 | #define TAINT_BAD_PAGE 5 |
| 247 | #define TAINT_USER 6 |
| 248 | #define TAINT_DIE 7 |
| 249 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 |
| 250 | #define TAINT_WARN 9 |
| 251 | #define TAINT_CRAP 10 |
| 252 | #define TAINT_FIRMWARE_WORKAROUND 11 |
| 253 | |
| 254 | extern const char hex_asc[]; |
| 255 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] |
| 256 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |
| 257 | |
| 258 | static inline char *pack_hex_byte(char *buf, u8 byte) |
| 259 | { |
| 260 | *buf++ = hex_asc_hi(byte); |
| 261 | *buf++ = hex_asc_lo(byte); |
| 262 | return buf; |
| 263 | } |
| 264 | |
| 265 | extern int hex_to_bin(char ch); |
| 266 | |
| 267 | /* |
| 268 | * General tracing related utility functions - trace_printk(), |
| 269 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
| 270 | * |
| 271 | * Use tracing_on/tracing_off when you want to quickly turn on or off |
| 272 | * tracing. It simply enables or disables the recording of the trace events. |
| 273 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
| 274 | * file, which gives a means for the kernel and userspace to interact. |
| 275 | * Place a tracing_off() in the kernel where you want tracing to end. |
| 276 | * From user space, examine the trace, and then echo 1 > tracing_on |
| 277 | * to continue tracing. |
| 278 | * |
| 279 | * tracing_stop/tracing_start has slightly more overhead. It is used |
| 280 | * by things like suspend to ram where disabling the recording of the |
| 281 | * trace is not enough, but tracing must actually stop because things |
| 282 | * like calling smp_processor_id() may crash the system. |
| 283 | * |
| 284 | * Most likely, you want to use tracing_on/tracing_off. |
| 285 | */ |
| 286 | #ifdef CONFIG_RING_BUFFER |
| 287 | void tracing_on(void); |
| 288 | void tracing_off(void); |
| 289 | /* trace_off_permanent stops recording with no way to bring it back */ |
| 290 | void tracing_off_permanent(void); |
| 291 | int tracing_is_on(void); |
| 292 | #else |
| 293 | static inline void tracing_on(void) { } |
| 294 | static inline void tracing_off(void) { } |
| 295 | static inline void tracing_off_permanent(void) { } |
| 296 | static inline int tracing_is_on(void) { return 0; } |
| 297 | #endif |
| 298 | |
| 299 | enum ftrace_dump_mode { |
| 300 | DUMP_NONE, |
| 301 | DUMP_ALL, |
| 302 | DUMP_ORIG, |
| 303 | }; |
| 304 | |
| 305 | #ifdef CONFIG_TRACING |
| 306 | extern void tracing_start(void); |
| 307 | extern void tracing_stop(void); |
| 308 | extern void ftrace_off_permanent(void); |
| 309 | |
| 310 | static inline void __attribute__ ((format (printf, 1, 2))) |
| 311 | ____trace_printk_check_format(const char *fmt, ...) |
| 312 | { |
| 313 | } |
| 314 | #define __trace_printk_check_format(fmt, args...) \ |
| 315 | do { \ |
| 316 | if (0) \ |
| 317 | ____trace_printk_check_format(fmt, ##args); \ |
| 318 | } while (0) |
| 319 | |
| 320 | /** |
| 321 | * trace_printk - printf formatting in the ftrace buffer |
| 322 | * @fmt: the printf format for printing |
| 323 | * |
| 324 | * Note: __trace_printk is an internal function for trace_printk and |
| 325 | * the @ip is passed in via the trace_printk macro. |
| 326 | * |
| 327 | * This function allows a kernel developer to debug fast path sections |
| 328 | * that printk is not appropriate for. By scattering in various |
| 329 | * printk like tracing in the code, a developer can quickly see |
| 330 | * where problems are occurring. |
| 331 | * |
| 332 | * This is intended as a debugging tool for the developer only. |
| 333 | * Please refrain from leaving trace_printks scattered around in |
| 334 | * your code. |
| 335 | */ |
| 336 | |
| 337 | #define trace_printk(fmt, args...) \ |
| 338 | do { \ |
| 339 | __trace_printk_check_format(fmt, ##args); \ |
| 340 | if (__builtin_constant_p(fmt)) { \ |
| 341 | static const char *trace_printk_fmt \ |
| 342 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 343 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
| 344 | \ |
| 345 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
| 346 | } else \ |
| 347 | __trace_printk(_THIS_IP_, fmt, ##args); \ |
| 348 | } while (0) |
| 349 | |
| 350 | extern int |
| 351 | __trace_bprintk(unsigned long ip, const char *fmt, ...) |
| 352 | __attribute__ ((format (printf, 2, 3))); |
| 353 | |
| 354 | extern int |
| 355 | __trace_printk(unsigned long ip, const char *fmt, ...) |
| 356 | __attribute__ ((format (printf, 2, 3))); |
| 357 | |
| 358 | extern void trace_dump_stack(void); |
| 359 | |
| 360 | /* |
| 361 | * The double __builtin_constant_p is because gcc will give us an error |
| 362 | * if we try to allocate the static variable to fmt if it is not a |
| 363 | * constant. Even with the outer if statement. |
| 364 | */ |
| 365 | #define ftrace_vprintk(fmt, vargs) \ |
| 366 | do { \ |
| 367 | if (__builtin_constant_p(fmt)) { \ |
| 368 | static const char *trace_printk_fmt \ |
| 369 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 370 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
| 371 | \ |
| 372 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
| 373 | } else \ |
| 374 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ |
| 375 | } while (0) |
| 376 | |
| 377 | extern int |
| 378 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
| 379 | |
| 380 | extern int |
| 381 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
| 382 | |
| 383 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
| 384 | #else |
| 385 | static inline int |
| 386 | trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); |
| 387 | |
| 388 | static inline void tracing_start(void) { } |
| 389 | static inline void tracing_stop(void) { } |
| 390 | static inline void ftrace_off_permanent(void) { } |
| 391 | static inline void trace_dump_stack(void) { } |
| 392 | static inline int |
| 393 | trace_printk(const char *fmt, ...) |
| 394 | { |
| 395 | return 0; |
| 396 | } |
| 397 | static inline int |
| 398 | ftrace_vprintk(const char *fmt, va_list ap) |
| 399 | { |
| 400 | return 0; |
| 401 | } |
| 402 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
| 403 | #endif /* CONFIG_TRACING */ |
| 404 | |
| 405 | /* |
| 406 | * min()/max()/clamp() macros that also do |
| 407 | * strict type-checking.. See the |
| 408 | * "unnecessary" pointer comparison. |
| 409 | */ |
| 410 | #define min(x, y) ({ \ |
| 411 | typeof(x) _min1 = (x); \ |
| 412 | typeof(y) _min2 = (y); \ |
| 413 | (void) (&_min1 == &_min2); \ |
| 414 | _min1 < _min2 ? _min1 : _min2; }) |
| 415 | |
| 416 | #define max(x, y) ({ \ |
| 417 | typeof(x) _max1 = (x); \ |
| 418 | typeof(y) _max2 = (y); \ |
| 419 | (void) (&_max1 == &_max2); \ |
| 420 | _max1 > _max2 ? _max1 : _max2; }) |
| 421 | |
| 422 | #define min3(x, y, z) ({ \ |
| 423 | typeof(x) _min1 = (x); \ |
| 424 | typeof(y) _min2 = (y); \ |
| 425 | typeof(z) _min3 = (z); \ |
| 426 | (void) (&_min1 == &_min2); \ |
| 427 | (void) (&_min1 == &_min3); \ |
| 428 | _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ |
| 429 | (_min2 < _min3 ? _min2 : _min3); }) |
| 430 | |
| 431 | #define max3(x, y, z) ({ \ |
| 432 | typeof(x) _max1 = (x); \ |
| 433 | typeof(y) _max2 = (y); \ |
| 434 | typeof(z) _max3 = (z); \ |
| 435 | (void) (&_max1 == &_max2); \ |
| 436 | (void) (&_max1 == &_max3); \ |
| 437 | _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ |
| 438 | (_max2 > _max3 ? _max2 : _max3); }) |
| 439 | |
| 440 | /** |
| 441 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero |
| 442 | * @x: value1 |
| 443 | * @y: value2 |
| 444 | */ |
| 445 | #define min_not_zero(x, y) ({ \ |
| 446 | typeof(x) __x = (x); \ |
| 447 | typeof(y) __y = (y); \ |
| 448 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) |
| 449 | |
| 450 | /** |
| 451 | * clamp - return a value clamped to a given range with strict typechecking |
| 452 | * @val: current value |
| 453 | * @min: minimum allowable value |
| 454 | * @max: maximum allowable value |
| 455 | * |
| 456 | * This macro does strict typechecking of min/max to make sure they are of the |
| 457 | * same type as val. See the unnecessary pointer comparisons. |
| 458 | */ |
| 459 | #define clamp(val, min, max) ({ \ |
| 460 | typeof(val) __val = (val); \ |
| 461 | typeof(min) __min = (min); \ |
| 462 | typeof(max) __max = (max); \ |
| 463 | (void) (&__val == &__min); \ |
| 464 | (void) (&__val == &__max); \ |
| 465 | __val = __val < __min ? __min: __val; \ |
| 466 | __val > __max ? __max: __val; }) |
| 467 | |
| 468 | /* |
| 469 | * ..and if you can't take the strict |
| 470 | * types, you can specify one yourself. |
| 471 | * |
| 472 | * Or not use min/max/clamp at all, of course. |
| 473 | */ |
| 474 | #define min_t(type, x, y) ({ \ |
| 475 | type __min1 = (x); \ |
| 476 | type __min2 = (y); \ |
| 477 | __min1 < __min2 ? __min1: __min2; }) |
| 478 | |
| 479 | #define max_t(type, x, y) ({ \ |
| 480 | type __max1 = (x); \ |
| 481 | type __max2 = (y); \ |
| 482 | __max1 > __max2 ? __max1: __max2; }) |
| 483 | |
| 484 | /** |
| 485 | * clamp_t - return a value clamped to a given range using a given type |
| 486 | * @type: the type of variable to use |
| 487 | * @val: current value |
| 488 | * @min: minimum allowable value |
| 489 | * @max: maximum allowable value |
| 490 | * |
| 491 | * This macro does no typechecking and uses temporary variables of type |
| 492 | * 'type' to make all the comparisons. |
| 493 | */ |
| 494 | #define clamp_t(type, val, min, max) ({ \ |
| 495 | type __val = (val); \ |
| 496 | type __min = (min); \ |
| 497 | type __max = (max); \ |
| 498 | __val = __val < __min ? __min: __val; \ |
| 499 | __val > __max ? __max: __val; }) |
| 500 | |
| 501 | /** |
| 502 | * clamp_val - return a value clamped to a given range using val's type |
| 503 | * @val: current value |
| 504 | * @min: minimum allowable value |
| 505 | * @max: maximum allowable value |
| 506 | * |
| 507 | * This macro does no typechecking and uses temporary variables of whatever |
| 508 | * type the input argument 'val' is. This is useful when val is an unsigned |
| 509 | * type and min and max are literals that will otherwise be assigned a signed |
| 510 | * integer type. |
| 511 | */ |
| 512 | #define clamp_val(val, min, max) ({ \ |
| 513 | typeof(val) __val = (val); \ |
| 514 | typeof(val) __min = (min); \ |
| 515 | typeof(val) __max = (max); \ |
| 516 | __val = __val < __min ? __min: __val; \ |
| 517 | __val > __max ? __max: __val; }) |
| 518 | |
| 519 | |
| 520 | /* |
| 521 | * swap - swap value of @a and @b |
| 522 | */ |
| 523 | #define swap(a, b) \ |
| 524 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) |
| 525 | |
| 526 | /** |
| 527 | * container_of - cast a member of a structure out to the containing structure |
| 528 | * @ptr: the pointer to the member. |
| 529 | * @type: the type of the container struct this is embedded in. |
| 530 | * @member: the name of the member within the struct. |
| 531 | * |
| 532 | */ |
| 533 | #define container_of(ptr, type, member) ({ \ |
| 534 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 535 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
| 536 | |
| 537 | struct sysinfo; |
| 538 | extern int do_sysinfo(struct sysinfo *info); |
| 539 | |
| 540 | #endif /* __KERNEL__ */ |
| 541 | |
| 542 | #define SI_LOAD_SHIFT 16 |
| 543 | struct sysinfo { |
| 544 | long uptime; /* Seconds since boot */ |
| 545 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
| 546 | unsigned long totalram; /* Total usable main memory size */ |
| 547 | unsigned long freeram; /* Available memory size */ |
| 548 | unsigned long sharedram; /* Amount of shared memory */ |
| 549 | unsigned long bufferram; /* Memory used by buffers */ |
| 550 | unsigned long totalswap; /* Total swap space size */ |
| 551 | unsigned long freeswap; /* swap space still available */ |
| 552 | unsigned short procs; /* Number of current processes */ |
| 553 | unsigned short pad; /* explicit padding for m68k */ |
| 554 | unsigned long totalhigh; /* Total high memory size */ |
| 555 | unsigned long freehigh; /* Available high memory size */ |
| 556 | unsigned int mem_unit; /* Memory unit size in bytes */ |
| 557 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
| 558 | }; |
| 559 | |
| 560 | /* Force a compilation error if condition is true */ |
| 561 | #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) |
| 562 | |
| 563 | /* Force a compilation error if condition is constant and true */ |
| 564 | #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) |
| 565 | |
| 566 | /* Force a compilation error if a constant expression is not a power of 2 */ |
| 567 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
| 568 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
| 569 | |
| 570 | /* Force a compilation error if condition is true, but also produce a |
| 571 | result (of value 0 and type size_t), so the expression can be used |
| 572 | e.g. in a structure initializer (or where-ever else comma expressions |
| 573 | aren't permitted). */ |
| 574 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
| 575 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
| 576 | |
| 577 | /* Trap pasters of __FUNCTION__ at compile-time */ |
| 578 | #define __FUNCTION__ (__func__) |
| 579 | |
| 580 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
| 581 | #ifdef CONFIG_NUMA |
| 582 | #define NUMA_BUILD 1 |
| 583 | #else |
| 584 | #define NUMA_BUILD 0 |
| 585 | #endif |
| 586 | |
| 587 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
| 588 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 589 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
| 590 | #endif |
| 591 | |
| 592 | #endif |