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TOMOYO Linux Cross Reference
Linux/include/linux/kernel.h

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  1 #ifndef _LINUX_KERNEL_H
  2 #define _LINUX_KERNEL_H
  3 
  4 #include <linux/sysinfo.h>
  5 
  6 /*
  7  * 'kernel.h' contains some often-used function prototypes etc
  8  */
  9 #define __ALIGN_KERNEL(x, a)            __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
 10 #define __ALIGN_KERNEL_MASK(x, mask)    (((x) + (mask)) & ~(mask))
 11 
 12 #ifdef __KERNEL__
 13 
 14 #include <stdarg.h>
 15 #include <linux/linkage.h>
 16 #include <linux/stddef.h>
 17 #include <linux/types.h>
 18 #include <linux/compiler.h>
 19 #include <linux/bitops.h>
 20 #include <linux/log2.h>
 21 #include <linux/typecheck.h>
 22 #include <linux/printk.h>
 23 #include <linux/dynamic_debug.h>
 24 #include <asm/byteorder.h>
 25 
 26 #define USHRT_MAX       ((u16)(~0U))
 27 #define SHRT_MAX        ((s16)(USHRT_MAX>>1))
 28 #define SHRT_MIN        ((s16)(-SHRT_MAX - 1))
 29 #define INT_MAX         ((int)(~0U>>1))
 30 #define INT_MIN         (-INT_MAX - 1)
 31 #define UINT_MAX        (~0U)
 32 #define LONG_MAX        ((long)(~0UL>>1))
 33 #define LONG_MIN        (-LONG_MAX - 1)
 34 #define ULONG_MAX       (~0UL)
 35 #define LLONG_MAX       ((long long)(~0ULL>>1))
 36 #define LLONG_MIN       (-LLONG_MAX - 1)
 37 #define ULLONG_MAX      (~0ULL)
 38 #define SIZE_MAX        (~(size_t)0)
 39 
 40 #define STACK_MAGIC     0xdeadbeef
 41 
 42 #define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))
 43 
 44 #define ALIGN(x, a)             __ALIGN_KERNEL((x), (a))
 45 #define __ALIGN_MASK(x, mask)   __ALIGN_KERNEL_MASK((x), (mask))
 46 #define PTR_ALIGN(p, a)         ((typeof(p))ALIGN((unsigned long)(p), (a)))
 47 #define IS_ALIGNED(x, a)                (((x) & ((typeof(x))(a) - 1)) == 0)
 48 
 49 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 50 
 51 /*
 52  * This looks more complex than it should be. But we need to
 53  * get the type for the ~ right in round_down (it needs to be
 54  * as wide as the result!), and we want to evaluate the macro
 55  * arguments just once each.
 56  */
 57 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
 58 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 59 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 60 
 61 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 62 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 63 #define DIV_ROUND_UP_ULL(ll,d) \
 64         ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
 65 
 66 #if BITS_PER_LONG == 32
 67 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
 68 #else
 69 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
 70 #endif
 71 
 72 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
 73 #define roundup(x, y) (                                 \
 74 {                                                       \
 75         const typeof(y) __y = y;                        \
 76         (((x) + (__y - 1)) / __y) * __y;                \
 77 }                                                       \
 78 )
 79 #define rounddown(x, y) (                               \
 80 {                                                       \
 81         typeof(x) __x = (x);                            \
 82         __x - (__x % (y));                              \
 83 }                                                       \
 84 )
 85 #define DIV_ROUND_CLOSEST(x, divisor)(                  \
 86 {                                                       \
 87         typeof(divisor) __divisor = divisor;            \
 88         (((x) + ((__divisor) / 2)) / (__divisor));      \
 89 }                                                       \
 90 )
 91 
 92 /*
 93  * Multiplies an integer by a fraction, while avoiding unnecessary
 94  * overflow or loss of precision.
 95  */
 96 #define mult_frac(x, numer, denom)(                     \
 97 {                                                       \
 98         typeof(x) quot = (x) / (denom);                 \
 99         typeof(x) rem  = (x) % (denom);                 \
100         (quot * (numer)) + ((rem * (numer)) / (denom)); \
101 }                                                       \
102 )
103 
104 
105 #define _RET_IP_                (unsigned long)__builtin_return_address(0)
106 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
107 
108 #ifdef CONFIG_LBDAF
109 # include <asm/div64.h>
110 # define sector_div(a, b) do_div(a, b)
111 #else
112 # define sector_div(n, b)( \
113 { \
114         int _res; \
115         _res = (n) % (b); \
116         (n) /= (b); \
117         _res; \
118 } \
119 )
120 #endif
121 
122 /**
123  * upper_32_bits - return bits 32-63 of a number
124  * @n: the number we're accessing
125  *
126  * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
127  * the "right shift count >= width of type" warning when that quantity is
128  * 32-bits.
129  */
130 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
131 
132 /**
133  * lower_32_bits - return bits 0-31 of a number
134  * @n: the number we're accessing
135  */
136 #define lower_32_bits(n) ((u32)(n))
137 
138 struct completion;
139 struct pt_regs;
140 struct user;
141 
142 #ifdef CONFIG_PREEMPT_VOLUNTARY
143 extern int _cond_resched(void);
144 # define might_resched() _cond_resched()
145 #else
146 # define might_resched() do { } while (0)
147 #endif
148 
149 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
150   void __might_sleep(const char *file, int line, int preempt_offset);
151 /**
152  * might_sleep - annotation for functions that can sleep
153  *
154  * this macro will print a stack trace if it is executed in an atomic
155  * context (spinlock, irq-handler, ...).
156  *
157  * This is a useful debugging help to be able to catch problems early and not
158  * be bitten later when the calling function happens to sleep when it is not
159  * supposed to.
160  */
161 # define might_sleep() \
162         do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
163 #else
164   static inline void __might_sleep(const char *file, int line,
165                                    int preempt_offset) { }
166 # define might_sleep() do { might_resched(); } while (0)
167 #endif
168 
169 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
170 
171 /*
172  * abs() handles unsigned and signed longs, ints, shorts and chars.  For all
173  * input types abs() returns a signed long.
174  * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
175  * for those.
176  */
177 #define abs(x) ({                                               \
178                 long ret;                                       \
179                 if (sizeof(x) == sizeof(long)) {                \
180                         long __x = (x);                         \
181                         ret = (__x < 0) ? -__x : __x;           \
182                 } else {                                        \
183                         int __x = (x);                          \
184                         ret = (__x < 0) ? -__x : __x;           \
185                 }                                               \
186                 ret;                                            \
187         })
188 
189 #define abs64(x) ({                             \
190                 s64 __x = (x);                  \
191                 (__x < 0) ? -__x : __x;         \
192         })
193 
194 #ifdef CONFIG_PROVE_LOCKING
195 void might_fault(void);
196 #else
197 static inline void might_fault(void)
198 {
199         might_sleep();
200 }
201 #endif
202 
203 extern struct atomic_notifier_head panic_notifier_list;
204 extern long (*panic_blink)(int state);
205 __printf(1, 2)
206 void panic(const char *fmt, ...)
207         __noreturn __cold;
208 extern void oops_enter(void);
209 extern void oops_exit(void);
210 void print_oops_end_marker(void);
211 extern int oops_may_print(void);
212 void do_exit(long error_code)
213         __noreturn;
214 void complete_and_exit(struct completion *, long)
215         __noreturn;
216 
217 /* Internal, do not use. */
218 int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
219 int __must_check _kstrtol(const char *s, unsigned int base, long *res);
220 
221 int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res);
222 int __must_check kstrtoll(const char *s, unsigned int base, long long *res);
223 static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
224 {
225         /*
226          * We want to shortcut function call, but
227          * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
228          */
229         if (sizeof(unsigned long) == sizeof(unsigned long long) &&
230             __alignof__(unsigned long) == __alignof__(unsigned long long))
231                 return kstrtoull(s, base, (unsigned long long *)res);
232         else
233                 return _kstrtoul(s, base, res);
234 }
235 
236 static inline int __must_check kstrtol(const char *s, unsigned int base, long *res)
237 {
238         /*
239          * We want to shortcut function call, but
240          * __builtin_types_compatible_p(long, long long) = 0.
241          */
242         if (sizeof(long) == sizeof(long long) &&
243             __alignof__(long) == __alignof__(long long))
244                 return kstrtoll(s, base, (long long *)res);
245         else
246                 return _kstrtol(s, base, res);
247 }
248 
249 int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res);
250 int __must_check kstrtoint(const char *s, unsigned int base, int *res);
251 
252 static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res)
253 {
254         return kstrtoull(s, base, res);
255 }
256 
257 static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res)
258 {
259         return kstrtoll(s, base, res);
260 }
261 
262 static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res)
263 {
264         return kstrtouint(s, base, res);
265 }
266 
267 static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res)
268 {
269         return kstrtoint(s, base, res);
270 }
271 
272 int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
273 int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
274 int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
275 int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
276 
277 int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
278 int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
279 int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res);
280 int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res);
281 int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res);
282 int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res);
283 int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
284 int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
285 int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
286 int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
287 
288 static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
289 {
290         return kstrtoull_from_user(s, count, base, res);
291 }
292 
293 static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res)
294 {
295         return kstrtoll_from_user(s, count, base, res);
296 }
297 
298 static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res)
299 {
300         return kstrtouint_from_user(s, count, base, res);
301 }
302 
303 static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res)
304 {
305         return kstrtoint_from_user(s, count, base, res);
306 }
307 
308 /* Obsolete, do not use.  Use kstrto<foo> instead */
309 
310 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
311 extern long simple_strtol(const char *,char **,unsigned int);
312 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
313 extern long long simple_strtoll(const char *,char **,unsigned int);
314 #define strict_strtoul  kstrtoul
315 #define strict_strtol   kstrtol
316 #define strict_strtoull kstrtoull
317 #define strict_strtoll  kstrtoll
318 
319 extern int num_to_str(char *buf, int size, unsigned long long num);
320 
321 /* lib/printf utilities */
322 
323 extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
324 extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list);
325 extern __printf(3, 4)
326 int snprintf(char *buf, size_t size, const char *fmt, ...);
327 extern __printf(3, 0)
328 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
329 extern __printf(3, 4)
330 int scnprintf(char *buf, size_t size, const char *fmt, ...);
331 extern __printf(3, 0)
332 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
333 extern __printf(2, 3)
334 char *kasprintf(gfp_t gfp, const char *fmt, ...);
335 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
336 
337 extern __scanf(2, 3)
338 int sscanf(const char *, const char *, ...);
339 extern __scanf(2, 0)
340 int vsscanf(const char *, const char *, va_list);
341 
342 extern int get_option(char **str, int *pint);
343 extern char *get_options(const char *str, int nints, int *ints);
344 extern unsigned long long memparse(const char *ptr, char **retptr);
345 
346 extern int core_kernel_text(unsigned long addr);
347 extern int core_kernel_data(unsigned long addr);
348 extern int __kernel_text_address(unsigned long addr);
349 extern int kernel_text_address(unsigned long addr);
350 extern int func_ptr_is_kernel_text(void *ptr);
351 
352 struct pid;
353 extern struct pid *session_of_pgrp(struct pid *pgrp);
354 
355 unsigned long int_sqrt(unsigned long);
356 
357 extern void bust_spinlocks(int yes);
358 extern void wake_up_klogd(void);
359 extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
360 extern int panic_timeout;
361 extern int panic_on_oops;
362 extern int panic_on_unrecovered_nmi;
363 extern int panic_on_io_nmi;
364 extern int sysctl_panic_on_stackoverflow;
365 extern const char *print_tainted(void);
366 extern void add_taint(unsigned flag);
367 extern int test_taint(unsigned flag);
368 extern unsigned long get_taint(void);
369 extern int root_mountflags;
370 
371 extern bool early_boot_irqs_disabled;
372 
373 /* Values used for system_state */
374 extern enum system_states {
375         SYSTEM_BOOTING,
376         SYSTEM_RUNNING,
377         SYSTEM_HALT,
378         SYSTEM_POWER_OFF,
379         SYSTEM_RESTART,
380 } system_state;
381 
382 #define TAINT_PROPRIETARY_MODULE        0
383 #define TAINT_FORCED_MODULE             1
384 #define TAINT_UNSAFE_SMP                2
385 #define TAINT_FORCED_RMMOD              3
386 #define TAINT_MACHINE_CHECK             4
387 #define TAINT_BAD_PAGE                  5
388 #define TAINT_USER                      6
389 #define TAINT_DIE                       7
390 #define TAINT_OVERRIDDEN_ACPI_TABLE     8
391 #define TAINT_WARN                      9
392 #define TAINT_CRAP                      10
393 #define TAINT_FIRMWARE_WORKAROUND       11
394 #define TAINT_OOT_MODULE                12
395 
396 extern const char hex_asc[];
397 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
398 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
399 
400 static inline char *hex_byte_pack(char *buf, u8 byte)
401 {
402         *buf++ = hex_asc_hi(byte);
403         *buf++ = hex_asc_lo(byte);
404         return buf;
405 }
406 
407 static inline char * __deprecated pack_hex_byte(char *buf, u8 byte)
408 {
409         return hex_byte_pack(buf, byte);
410 }
411 
412 extern int hex_to_bin(char ch);
413 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
414 
415 /*
416  * General tracing related utility functions - trace_printk(),
417  * tracing_on/tracing_off and tracing_start()/tracing_stop
418  *
419  * Use tracing_on/tracing_off when you want to quickly turn on or off
420  * tracing. It simply enables or disables the recording of the trace events.
421  * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
422  * file, which gives a means for the kernel and userspace to interact.
423  * Place a tracing_off() in the kernel where you want tracing to end.
424  * From user space, examine the trace, and then echo 1 > tracing_on
425  * to continue tracing.
426  *
427  * tracing_stop/tracing_start has slightly more overhead. It is used
428  * by things like suspend to ram where disabling the recording of the
429  * trace is not enough, but tracing must actually stop because things
430  * like calling smp_processor_id() may crash the system.
431  *
432  * Most likely, you want to use tracing_on/tracing_off.
433  */
434 #ifdef CONFIG_RING_BUFFER
435 /* trace_off_permanent stops recording with no way to bring it back */
436 void tracing_off_permanent(void);
437 #else
438 static inline void tracing_off_permanent(void) { }
439 #endif
440 
441 enum ftrace_dump_mode {
442         DUMP_NONE,
443         DUMP_ALL,
444         DUMP_ORIG,
445 };
446 
447 #ifdef CONFIG_TRACING
448 void tracing_on(void);
449 void tracing_off(void);
450 int tracing_is_on(void);
451 
452 extern void tracing_start(void);
453 extern void tracing_stop(void);
454 extern void ftrace_off_permanent(void);
455 
456 static inline __printf(1, 2)
457 void ____trace_printk_check_format(const char *fmt, ...)
458 {
459 }
460 #define __trace_printk_check_format(fmt, args...)                       \
461 do {                                                                    \
462         if (0)                                                          \
463                 ____trace_printk_check_format(fmt, ##args);             \
464 } while (0)
465 
466 /**
467  * trace_printk - printf formatting in the ftrace buffer
468  * @fmt: the printf format for printing
469  *
470  * Note: __trace_printk is an internal function for trace_printk and
471  *       the @ip is passed in via the trace_printk macro.
472  *
473  * This function allows a kernel developer to debug fast path sections
474  * that printk is not appropriate for. By scattering in various
475  * printk like tracing in the code, a developer can quickly see
476  * where problems are occurring.
477  *
478  * This is intended as a debugging tool for the developer only.
479  * Please refrain from leaving trace_printks scattered around in
480  * your code.
481  */
482 
483 #define trace_printk(fmt, args...)                                      \
484 do {                                                                    \
485         static const char *trace_printk_fmt                             \
486                 __attribute__((section("__trace_printk_fmt"))) =        \
487                 __builtin_constant_p(fmt) ? fmt : NULL;                 \
488                                                                         \
489         __trace_printk_check_format(fmt, ##args);                       \
490                                                                         \
491         if (__builtin_constant_p(fmt))                                  \
492                 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args);   \
493         else                                                            \
494                 __trace_printk(_THIS_IP_, fmt, ##args);                 \
495 } while (0)
496 
497 extern __printf(2, 3)
498 int __trace_bprintk(unsigned long ip, const char *fmt, ...);
499 
500 extern __printf(2, 3)
501 int __trace_printk(unsigned long ip, const char *fmt, ...);
502 
503 extern void trace_dump_stack(void);
504 
505 /*
506  * The double __builtin_constant_p is because gcc will give us an error
507  * if we try to allocate the static variable to fmt if it is not a
508  * constant. Even with the outer if statement.
509  */
510 #define ftrace_vprintk(fmt, vargs)                                      \
511 do {                                                                    \
512         if (__builtin_constant_p(fmt)) {                                \
513                 static const char *trace_printk_fmt                     \
514                   __attribute__((section("__trace_printk_fmt"))) =      \
515                         __builtin_constant_p(fmt) ? fmt : NULL;         \
516                                                                         \
517                 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs);  \
518         } else                                                          \
519                 __ftrace_vprintk(_THIS_IP_, fmt, vargs);                \
520 } while (0)
521 
522 extern int
523 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
524 
525 extern int
526 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
527 
528 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
529 #else
530 static inline __printf(1, 2)
531 int trace_printk(const char *fmt, ...);
532 
533 static inline void tracing_start(void) { }
534 static inline void tracing_stop(void) { }
535 static inline void ftrace_off_permanent(void) { }
536 static inline void trace_dump_stack(void) { }
537 
538 static inline void tracing_on(void) { }
539 static inline void tracing_off(void) { }
540 static inline int tracing_is_on(void) { return 0; }
541 
542 static inline int
543 trace_printk(const char *fmt, ...)
544 {
545         return 0;
546 }
547 static inline int
548 ftrace_vprintk(const char *fmt, va_list ap)
549 {
550         return 0;
551 }
552 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
553 #endif /* CONFIG_TRACING */
554 
555 /*
556  * min()/max()/clamp() macros that also do
557  * strict type-checking.. See the
558  * "unnecessary" pointer comparison.
559  */
560 #define min(x, y) ({                            \
561         typeof(x) _min1 = (x);                  \
562         typeof(y) _min2 = (y);                  \
563         (void) (&_min1 == &_min2);              \
564         _min1 < _min2 ? _min1 : _min2; })
565 
566 #define max(x, y) ({                            \
567         typeof(x) _max1 = (x);                  \
568         typeof(y) _max2 = (y);                  \
569         (void) (&_max1 == &_max2);              \
570         _max1 > _max2 ? _max1 : _max2; })
571 
572 #define min3(x, y, z) ({                        \
573         typeof(x) _min1 = (x);                  \
574         typeof(y) _min2 = (y);                  \
575         typeof(z) _min3 = (z);                  \
576         (void) (&_min1 == &_min2);              \
577         (void) (&_min1 == &_min3);              \
578         _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
579                 (_min2 < _min3 ? _min2 : _min3); })
580 
581 #define max3(x, y, z) ({                        \
582         typeof(x) _max1 = (x);                  \
583         typeof(y) _max2 = (y);                  \
584         typeof(z) _max3 = (z);                  \
585         (void) (&_max1 == &_max2);              \
586         (void) (&_max1 == &_max3);              \
587         _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
588                 (_max2 > _max3 ? _max2 : _max3); })
589 
590 /**
591  * min_not_zero - return the minimum that is _not_ zero, unless both are zero
592  * @x: value1
593  * @y: value2
594  */
595 #define min_not_zero(x, y) ({                   \
596         typeof(x) __x = (x);                    \
597         typeof(y) __y = (y);                    \
598         __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
599 
600 /**
601  * clamp - return a value clamped to a given range with strict typechecking
602  * @val: current value
603  * @min: minimum allowable value
604  * @max: maximum allowable value
605  *
606  * This macro does strict typechecking of min/max to make sure they are of the
607  * same type as val.  See the unnecessary pointer comparisons.
608  */
609 #define clamp(val, min, max) ({                 \
610         typeof(val) __val = (val);              \
611         typeof(min) __min = (min);              \
612         typeof(max) __max = (max);              \
613         (void) (&__val == &__min);              \
614         (void) (&__val == &__max);              \
615         __val = __val < __min ? __min: __val;   \
616         __val > __max ? __max: __val; })
617 
618 /*
619  * ..and if you can't take the strict
620  * types, you can specify one yourself.
621  *
622  * Or not use min/max/clamp at all, of course.
623  */
624 #define min_t(type, x, y) ({                    \
625         type __min1 = (x);                      \
626         type __min2 = (y);                      \
627         __min1 < __min2 ? __min1: __min2; })
628 
629 #define max_t(type, x, y) ({                    \
630         type __max1 = (x);                      \
631         type __max2 = (y);                      \
632         __max1 > __max2 ? __max1: __max2; })
633 
634 /**
635  * clamp_t - return a value clamped to a given range using a given type
636  * @type: the type of variable to use
637  * @val: current value
638  * @min: minimum allowable value
639  * @max: maximum allowable value
640  *
641  * This macro does no typechecking and uses temporary variables of type
642  * 'type' to make all the comparisons.
643  */
644 #define clamp_t(type, val, min, max) ({         \
645         type __val = (val);                     \
646         type __min = (min);                     \
647         type __max = (max);                     \
648         __val = __val < __min ? __min: __val;   \
649         __val > __max ? __max: __val; })
650 
651 /**
652  * clamp_val - return a value clamped to a given range using val's type
653  * @val: current value
654  * @min: minimum allowable value
655  * @max: maximum allowable value
656  *
657  * This macro does no typechecking and uses temporary variables of whatever
658  * type the input argument 'val' is.  This is useful when val is an unsigned
659  * type and min and max are literals that will otherwise be assigned a signed
660  * integer type.
661  */
662 #define clamp_val(val, min, max) ({             \
663         typeof(val) __val = (val);              \
664         typeof(val) __min = (min);              \
665         typeof(val) __max = (max);              \
666         __val = __val < __min ? __min: __val;   \
667         __val > __max ? __max: __val; })
668 
669 
670 /*
671  * swap - swap value of @a and @b
672  */
673 #define swap(a, b) \
674         do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
675 
676 /**
677  * container_of - cast a member of a structure out to the containing structure
678  * @ptr:        the pointer to the member.
679  * @type:       the type of the container struct this is embedded in.
680  * @member:     the name of the member within the struct.
681  *
682  */
683 #define container_of(ptr, type, member) ({                      \
684         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
685         (type *)( (char *)__mptr - offsetof(type,member) );})
686 
687 /* Trap pasters of __FUNCTION__ at compile-time */
688 #define __FUNCTION__ (__func__)
689 
690 /* This helps us to avoid #ifdef CONFIG_NUMA */
691 #ifdef CONFIG_NUMA
692 #define NUMA_BUILD 1
693 #else
694 #define NUMA_BUILD 0
695 #endif
696 
697 /* This helps us avoid #ifdef CONFIG_COMPACTION */
698 #ifdef CONFIG_COMPACTION
699 #define COMPACTION_BUILD 1
700 #else
701 #define COMPACTION_BUILD 0
702 #endif
703 
704 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
705 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
706 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
707 #endif
708 
709 extern int do_sysinfo(struct sysinfo *info);
710 
711 #endif /* __KERNEL__ */
712 
713 #endif
714 

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