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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 
  5 #include <stdarg.h>
  6 #include <linux/linkage.h>
  7 #include <linux/stddef.h>
  8 #include <linux/types.h>
  9 #include <linux/compiler.h>
 10 #include <linux/bitops.h>
 11 #include <linux/log2.h>
 12 #include <linux/typecheck.h>
 13 #include <linux/printk.h>
 14 #include <linux/dynamic_debug.h>
 15 #include <asm/byteorder.h>
 16 #include <uapi/linux/kernel.h>
 17 
 18 #define USHRT_MAX       ((u16)(~0U))
 19 #define SHRT_MAX        ((s16)(USHRT_MAX>>1))
 20 #define SHRT_MIN        ((s16)(-SHRT_MAX - 1))
 21 #define INT_MAX         ((int)(~0U>>1))
 22 #define INT_MIN         (-INT_MAX - 1)
 23 #define UINT_MAX        (~0U)
 24 #define LONG_MAX        ((long)(~0UL>>1))
 25 #define LONG_MIN        (-LONG_MAX - 1)
 26 #define ULONG_MAX       (~0UL)
 27 #define LLONG_MAX       ((long long)(~0ULL>>1))
 28 #define LLONG_MIN       (-LLONG_MAX - 1)
 29 #define ULLONG_MAX      (~0ULL)
 30 #define SIZE_MAX        (~(size_t)0)
 31 
 32 #define STACK_MAGIC     0xdeadbeef
 33 
 34 #define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))
 35 
 36 #define ALIGN(x, a)             __ALIGN_KERNEL((x), (a))
 37 #define __ALIGN_MASK(x, mask)   __ALIGN_KERNEL_MASK((x), (mask))
 38 #define PTR_ALIGN(p, a)         ((typeof(p))ALIGN((unsigned long)(p), (a)))
 39 #define IS_ALIGNED(x, a)                (((x) & ((typeof(x))(a) - 1)) == 0)
 40 
 41 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 42 
 43 /*
 44  * This looks more complex than it should be. But we need to
 45  * get the type for the ~ right in round_down (it needs to be
 46  * as wide as the result!), and we want to evaluate the macro
 47  * arguments just once each.
 48  */
 49 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
 50 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 51 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 52 
 53 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 54 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 55 #define DIV_ROUND_UP_ULL(ll,d) \
 56         ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
 57 
 58 #if BITS_PER_LONG == 32
 59 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
 60 #else
 61 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
 62 #endif
 63 
 64 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
 65 #define roundup(x, y) (                                 \
 66 {                                                       \
 67         const typeof(y) __y = y;                        \
 68         (((x) + (__y - 1)) / __y) * __y;                \
 69 }                                                       \
 70 )
 71 #define rounddown(x, y) (                               \
 72 {                                                       \
 73         typeof(x) __x = (x);                            \
 74         __x - (__x % (y));                              \
 75 }                                                       \
 76 )
 77 
 78 /*
 79  * Divide positive or negative dividend by positive divisor and round
 80  * to closest integer. Result is undefined for negative divisors and
 81  * for negative dividends if the divisor variable type is unsigned.
 82  */
 83 #define DIV_ROUND_CLOSEST(x, divisor)(                  \
 84 {                                                       \
 85         typeof(x) __x = x;                              \
 86         typeof(divisor) __d = divisor;                  \
 87         (((typeof(x))-1) > 0 ||                         \
 88          ((typeof(divisor))-1) > 0 || (__x) > 0) ?      \
 89                 (((__x) + ((__d) / 2)) / (__d)) :       \
 90                 (((__x) - ((__d) / 2)) / (__d));        \
 91 }                                                       \
 92 )
 93 
 94 /*
 95  * Multiplies an integer by a fraction, while avoiding unnecessary
 96  * overflow or loss of precision.
 97  */
 98 #define mult_frac(x, numer, denom)(                     \
 99 {                                                       \
100         typeof(x) quot = (x) / (denom);                 \
101         typeof(x) rem  = (x) % (denom);                 \
102         (quot * (numer)) + ((rem * (numer)) / (denom)); \
103 }                                                       \
104 )
105 
106 
107 #define _RET_IP_                (unsigned long)__builtin_return_address(0)
108 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
109 
110 #ifdef CONFIG_LBDAF
111 # include <asm/div64.h>
112 # define sector_div(a, b) do_div(a, b)
113 #else
114 # define sector_div(n, b)( \
115 { \
116         int _res; \
117         _res = (n) % (b); \
118         (n) /= (b); \
119         _res; \
120 } \
121 )
122 #endif
123 
124 /**
125  * upper_32_bits - return bits 32-63 of a number
126  * @n: the number we're accessing
127  *
128  * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
129  * the "right shift count >= width of type" warning when that quantity is
130  * 32-bits.
131  */
132 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
133 
134 /**
135  * lower_32_bits - return bits 0-31 of a number
136  * @n: the number we're accessing
137  */
138 #define lower_32_bits(n) ((u32)(n))
139 
140 struct completion;
141 struct pt_regs;
142 struct user;
143 
144 #ifdef CONFIG_PREEMPT_VOLUNTARY
145 extern int _cond_resched(void);
146 # define might_resched() _cond_resched()
147 #else
148 # define might_resched() do { } while (0)
149 #endif
150 
151 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
152   void __might_sleep(const char *file, int line, int preempt_offset);
153 /**
154  * might_sleep - annotation for functions that can sleep
155  *
156  * this macro will print a stack trace if it is executed in an atomic
157  * context (spinlock, irq-handler, ...).
158  *
159  * This is a useful debugging help to be able to catch problems early and not
160  * be bitten later when the calling function happens to sleep when it is not
161  * supposed to.
162  */
163 # define might_sleep() \
164         do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
165 #else
166   static inline void __might_sleep(const char *file, int line,
167                                    int preempt_offset) { }
168 # define might_sleep() do { might_resched(); } while (0)
169 #endif
170 
171 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
172 
173 /*
174  * abs() handles unsigned and signed longs, ints, shorts and chars.  For all
175  * input types abs() returns a signed long.
176  * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
177  * for those.
178  */
179 #define abs(x) ({                                               \
180                 long ret;                                       \
181                 if (sizeof(x) == sizeof(long)) {                \
182                         long __x = (x);                         \
183                         ret = (__x < 0) ? -__x : __x;           \
184                 } else {                                        \
185                         int __x = (x);                          \
186                         ret = (__x < 0) ? -__x : __x;           \
187                 }                                               \
188                 ret;                                            \
189         })
190 
191 #define abs64(x) ({                             \
192                 s64 __x = (x);                  \
193                 (__x < 0) ? -__x : __x;         \
194         })
195 
196 #ifdef CONFIG_PROVE_LOCKING
197 void might_fault(void);
198 #else
199 static inline void might_fault(void)
200 {
201         might_sleep();
202 }
203 #endif
204 
205 extern struct atomic_notifier_head panic_notifier_list;
206 extern long (*panic_blink)(int state);
207 __printf(1, 2)
208 void panic(const char *fmt, ...)
209         __noreturn __cold;
210 extern void oops_enter(void);
211 extern void oops_exit(void);
212 void print_oops_end_marker(void);
213 extern int oops_may_print(void);
214 void do_exit(long error_code)
215         __noreturn;
216 void complete_and_exit(struct completion *, long)
217         __noreturn;
218 
219 /* Internal, do not use. */
220 int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
221 int __must_check _kstrtol(const char *s, unsigned int base, long *res);
222 
223 int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res);
224 int __must_check kstrtoll(const char *s, unsigned int base, long long *res);
225 static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
226 {
227         /*
228          * We want to shortcut function call, but
229          * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
230          */
231         if (sizeof(unsigned long) == sizeof(unsigned long long) &&
232             __alignof__(unsigned long) == __alignof__(unsigned long long))
233                 return kstrtoull(s, base, (unsigned long long *)res);
234         else
235                 return _kstrtoul(s, base, res);
236 }
237 
238 static inline int __must_check kstrtol(const char *s, unsigned int base, long *res)
239 {
240         /*
241          * We want to shortcut function call, but
242          * __builtin_types_compatible_p(long, long long) = 0.
243          */
244         if (sizeof(long) == sizeof(long long) &&
245             __alignof__(long) == __alignof__(long long))
246                 return kstrtoll(s, base, (long long *)res);
247         else
248                 return _kstrtol(s, base, res);
249 }
250 
251 int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res);
252 int __must_check kstrtoint(const char *s, unsigned int base, int *res);
253 
254 static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res)
255 {
256         return kstrtoull(s, base, res);
257 }
258 
259 static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res)
260 {
261         return kstrtoll(s, base, res);
262 }
263 
264 static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res)
265 {
266         return kstrtouint(s, base, res);
267 }
268 
269 static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res)
270 {
271         return kstrtoint(s, base, res);
272 }
273 
274 int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
275 int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
276 int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
277 int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
278 
279 int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
280 int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
281 int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res);
282 int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res);
283 int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res);
284 int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res);
285 int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
286 int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
287 int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
288 int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
289 
290 static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
291 {
292         return kstrtoull_from_user(s, count, base, res);
293 }
294 
295 static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res)
296 {
297         return kstrtoll_from_user(s, count, base, res);
298 }
299 
300 static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res)
301 {
302         return kstrtouint_from_user(s, count, base, res);
303 }
304 
305 static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res)
306 {
307         return kstrtoint_from_user(s, count, base, res);
308 }
309 
310 /* Obsolete, do not use.  Use kstrto<foo> instead */
311 
312 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
313 extern long simple_strtol(const char *,char **,unsigned int);
314 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
315 extern long long simple_strtoll(const char *,char **,unsigned int);
316 #define strict_strtoul  kstrtoul
317 #define strict_strtol   kstrtol
318 #define strict_strtoull kstrtoull
319 #define strict_strtoll  kstrtoll
320 
321 extern int num_to_str(char *buf, int size, unsigned long long num);
322 
323 /* lib/printf utilities */
324 
325 extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
326 extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list);
327 extern __printf(3, 4)
328 int snprintf(char *buf, size_t size, const char *fmt, ...);
329 extern __printf(3, 0)
330 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
331 extern __printf(3, 4)
332 int scnprintf(char *buf, size_t size, const char *fmt, ...);
333 extern __printf(3, 0)
334 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
335 extern __printf(2, 3)
336 char *kasprintf(gfp_t gfp, const char *fmt, ...);
337 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
338 
339 extern __scanf(2, 3)
340 int sscanf(const char *, const char *, ...);
341 extern __scanf(2, 0)
342 int vsscanf(const char *, const char *, va_list);
343 
344 extern int get_option(char **str, int *pint);
345 extern char *get_options(const char *str, int nints, int *ints);
346 extern unsigned long long memparse(const char *ptr, char **retptr);
347 
348 extern int core_kernel_text(unsigned long addr);
349 extern int core_kernel_data(unsigned long addr);
350 extern int __kernel_text_address(unsigned long addr);
351 extern int kernel_text_address(unsigned long addr);
352 extern int func_ptr_is_kernel_text(void *ptr);
353 
354 struct pid;
355 extern struct pid *session_of_pgrp(struct pid *pgrp);
356 
357 unsigned long int_sqrt(unsigned long);
358 
359 extern void bust_spinlocks(int yes);
360 extern void wake_up_klogd(void);
361 extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
362 extern int panic_timeout;
363 extern int panic_on_oops;
364 extern int panic_on_unrecovered_nmi;
365 extern int panic_on_io_nmi;
366 extern int sysctl_panic_on_stackoverflow;
367 extern const char *print_tainted(void);
368 extern void add_taint(unsigned flag);
369 extern int test_taint(unsigned flag);
370 extern unsigned long get_taint(void);
371 extern int root_mountflags;
372 
373 extern bool early_boot_irqs_disabled;
374 
375 /* Values used for system_state */
376 extern enum system_states {
377         SYSTEM_BOOTING,
378         SYSTEM_RUNNING,
379         SYSTEM_HALT,
380         SYSTEM_POWER_OFF,
381         SYSTEM_RESTART,
382 } system_state;
383 
384 #define TAINT_PROPRIETARY_MODULE        0
385 #define TAINT_FORCED_MODULE             1
386 #define TAINT_UNSAFE_SMP                2
387 #define TAINT_FORCED_RMMOD              3
388 #define TAINT_MACHINE_CHECK             4
389 #define TAINT_BAD_PAGE                  5
390 #define TAINT_USER                      6
391 #define TAINT_DIE                       7
392 #define TAINT_OVERRIDDEN_ACPI_TABLE     8
393 #define TAINT_WARN                      9
394 #define TAINT_CRAP                      10
395 #define TAINT_FIRMWARE_WORKAROUND       11
396 #define TAINT_OOT_MODULE                12
397 
398 extern const char hex_asc[];
399 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
400 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
401 
402 static inline char *hex_byte_pack(char *buf, u8 byte)
403 {
404         *buf++ = hex_asc_hi(byte);
405         *buf++ = hex_asc_lo(byte);
406         return buf;
407 }
408 
409 static inline char * __deprecated pack_hex_byte(char *buf, u8 byte)
410 {
411         return hex_byte_pack(buf, byte);
412 }
413 
414 extern int hex_to_bin(char ch);
415 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
416 
417 /*
418  * General tracing related utility functions - trace_printk(),
419  * tracing_on/tracing_off and tracing_start()/tracing_stop
420  *
421  * Use tracing_on/tracing_off when you want to quickly turn on or off
422  * tracing. It simply enables or disables the recording of the trace events.
423  * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
424  * file, which gives a means for the kernel and userspace to interact.
425  * Place a tracing_off() in the kernel where you want tracing to end.
426  * From user space, examine the trace, and then echo 1 > tracing_on
427  * to continue tracing.
428  *
429  * tracing_stop/tracing_start has slightly more overhead. It is used
430  * by things like suspend to ram where disabling the recording of the
431  * trace is not enough, but tracing must actually stop because things
432  * like calling smp_processor_id() may crash the system.
433  *
434  * Most likely, you want to use tracing_on/tracing_off.
435  */
436 #ifdef CONFIG_RING_BUFFER
437 /* trace_off_permanent stops recording with no way to bring it back */
438 void tracing_off_permanent(void);
439 #else
440 static inline void tracing_off_permanent(void) { }
441 #endif
442 
443 enum ftrace_dump_mode {
444         DUMP_NONE,
445         DUMP_ALL,
446         DUMP_ORIG,
447 };
448 
449 #ifdef CONFIG_TRACING
450 void tracing_on(void);
451 void tracing_off(void);
452 int tracing_is_on(void);
453 
454 extern void tracing_start(void);
455 extern void tracing_stop(void);
456 extern void ftrace_off_permanent(void);
457 
458 static inline __printf(1, 2)
459 void ____trace_printk_check_format(const char *fmt, ...)
460 {
461 }
462 #define __trace_printk_check_format(fmt, args...)                       \
463 do {                                                                    \
464         if (0)                                                          \
465                 ____trace_printk_check_format(fmt, ##args);             \
466 } while (0)
467 
468 /**
469  * trace_printk - printf formatting in the ftrace buffer
470  * @fmt: the printf format for printing
471  *
472  * Note: __trace_printk is an internal function for trace_printk and
473  *       the @ip is passed in via the trace_printk macro.
474  *
475  * This function allows a kernel developer to debug fast path sections
476  * that printk is not appropriate for. By scattering in various
477  * printk like tracing in the code, a developer can quickly see
478  * where problems are occurring.
479  *
480  * This is intended as a debugging tool for the developer only.
481  * Please refrain from leaving trace_printks scattered around in
482  * your code.
483  */
484 
485 #define trace_printk(fmt, args...)                                      \
486 do {                                                                    \
487         static const char *trace_printk_fmt                             \
488                 __attribute__((section("__trace_printk_fmt"))) =        \
489                 __builtin_constant_p(fmt) ? fmt : NULL;                 \
490                                                                         \
491         __trace_printk_check_format(fmt, ##args);                       \
492                                                                         \
493         if (__builtin_constant_p(fmt))                                  \
494                 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args);   \
495         else                                                            \
496                 __trace_printk(_THIS_IP_, fmt, ##args);                 \
497 } while (0)
498 
499 extern __printf(2, 3)
500 int __trace_bprintk(unsigned long ip, const char *fmt, ...);
501 
502 extern __printf(2, 3)
503 int __trace_printk(unsigned long ip, const char *fmt, ...);
504 
505 extern void trace_dump_stack(void);
506 
507 /*
508  * The double __builtin_constant_p is because gcc will give us an error
509  * if we try to allocate the static variable to fmt if it is not a
510  * constant. Even with the outer if statement.
511  */
512 #define ftrace_vprintk(fmt, vargs)                                      \
513 do {                                                                    \
514         if (__builtin_constant_p(fmt)) {                                \
515                 static const char *trace_printk_fmt                     \
516                   __attribute__((section("__trace_printk_fmt"))) =      \
517                         __builtin_constant_p(fmt) ? fmt : NULL;         \
518                                                                         \
519                 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs);  \
520         } else                                                          \
521                 __ftrace_vprintk(_THIS_IP_, fmt, vargs);                \
522 } while (0)
523 
524 extern int
525 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
526 
527 extern int
528 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
529 
530 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
531 #else
532 static inline __printf(1, 2)
533 int trace_printk(const char *fmt, ...);
534 
535 static inline void tracing_start(void) { }
536 static inline void tracing_stop(void) { }
537 static inline void ftrace_off_permanent(void) { }
538 static inline void trace_dump_stack(void) { }
539 
540 static inline void tracing_on(void) { }
541 static inline void tracing_off(void) { }
542 static inline int tracing_is_on(void) { return 0; }
543 
544 static inline int
545 trace_printk(const char *fmt, ...)
546 {
547         return 0;
548 }
549 static inline int
550 ftrace_vprintk(const char *fmt, va_list ap)
551 {
552         return 0;
553 }
554 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
555 #endif /* CONFIG_TRACING */
556 
557 /*
558  * min()/max()/clamp() macros that also do
559  * strict type-checking.. See the
560  * "unnecessary" pointer comparison.
561  */
562 #define min(x, y) ({                            \
563         typeof(x) _min1 = (x);                  \
564         typeof(y) _min2 = (y);                  \
565         (void) (&_min1 == &_min2);              \
566         _min1 < _min2 ? _min1 : _min2; })
567 
568 #define max(x, y) ({                            \
569         typeof(x) _max1 = (x);                  \
570         typeof(y) _max2 = (y);                  \
571         (void) (&_max1 == &_max2);              \
572         _max1 > _max2 ? _max1 : _max2; })
573 
574 #define min3(x, y, z) ({                        \
575         typeof(x) _min1 = (x);                  \
576         typeof(y) _min2 = (y);                  \
577         typeof(z) _min3 = (z);                  \
578         (void) (&_min1 == &_min2);              \
579         (void) (&_min1 == &_min3);              \
580         _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
581                 (_min2 < _min3 ? _min2 : _min3); })
582 
583 #define max3(x, y, z) ({                        \
584         typeof(x) _max1 = (x);                  \
585         typeof(y) _max2 = (y);                  \
586         typeof(z) _max3 = (z);                  \
587         (void) (&_max1 == &_max2);              \
588         (void) (&_max1 == &_max3);              \
589         _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
590                 (_max2 > _max3 ? _max2 : _max3); })
591 
592 /**
593  * min_not_zero - return the minimum that is _not_ zero, unless both are zero
594  * @x: value1
595  * @y: value2
596  */
597 #define min_not_zero(x, y) ({                   \
598         typeof(x) __x = (x);                    \
599         typeof(y) __y = (y);                    \
600         __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
601 
602 /**
603  * clamp - return a value clamped to a given range with strict typechecking
604  * @val: current value
605  * @min: minimum allowable value
606  * @max: maximum allowable value
607  *
608  * This macro does strict typechecking of min/max to make sure they are of the
609  * same type as val.  See the unnecessary pointer comparisons.
610  */
611 #define clamp(val, min, max) ({                 \
612         typeof(val) __val = (val);              \
613         typeof(min) __min = (min);              \
614         typeof(max) __max = (max);              \
615         (void) (&__val == &__min);              \
616         (void) (&__val == &__max);              \
617         __val = __val < __min ? __min: __val;   \
618         __val > __max ? __max: __val; })
619 
620 /*
621  * ..and if you can't take the strict
622  * types, you can specify one yourself.
623  *
624  * Or not use min/max/clamp at all, of course.
625  */
626 #define min_t(type, x, y) ({                    \
627         type __min1 = (x);                      \
628         type __min2 = (y);                      \
629         __min1 < __min2 ? __min1: __min2; })
630 
631 #define max_t(type, x, y) ({                    \
632         type __max1 = (x);                      \
633         type __max2 = (y);                      \
634         __max1 > __max2 ? __max1: __max2; })
635 
636 /**
637  * clamp_t - return a value clamped to a given range using a given type
638  * @type: the type of variable to use
639  * @val: current value
640  * @min: minimum allowable value
641  * @max: maximum allowable value
642  *
643  * This macro does no typechecking and uses temporary variables of type
644  * 'type' to make all the comparisons.
645  */
646 #define clamp_t(type, val, min, max) ({         \
647         type __val = (val);                     \
648         type __min = (min);                     \
649         type __max = (max);                     \
650         __val = __val < __min ? __min: __val;   \
651         __val > __max ? __max: __val; })
652 
653 /**
654  * clamp_val - return a value clamped to a given range using val's type
655  * @val: current value
656  * @min: minimum allowable value
657  * @max: maximum allowable value
658  *
659  * This macro does no typechecking and uses temporary variables of whatever
660  * type the input argument 'val' is.  This is useful when val is an unsigned
661  * type and min and max are literals that will otherwise be assigned a signed
662  * integer type.
663  */
664 #define clamp_val(val, min, max) ({             \
665         typeof(val) __val = (val);              \
666         typeof(val) __min = (min);              \
667         typeof(val) __max = (max);              \
668         __val = __val < __min ? __min: __val;   \
669         __val > __max ? __max: __val; })
670 
671 
672 /*
673  * swap - swap value of @a and @b
674  */
675 #define swap(a, b) \
676         do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
677 
678 /**
679  * container_of - cast a member of a structure out to the containing structure
680  * @ptr:        the pointer to the member.
681  * @type:       the type of the container struct this is embedded in.
682  * @member:     the name of the member within the struct.
683  *
684  */
685 #define container_of(ptr, type, member) ({                      \
686         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
687         (type *)( (char *)__mptr - offsetof(type,member) );})
688 
689 /* Trap pasters of __FUNCTION__ at compile-time */
690 #define __FUNCTION__ (__func__)
691 
692 /* This helps us to avoid #ifdef CONFIG_NUMA */
693 #ifdef CONFIG_NUMA
694 #define NUMA_BUILD 1
695 #else
696 #define NUMA_BUILD 0
697 #endif
698 
699 /* This helps us avoid #ifdef CONFIG_COMPACTION */
700 #ifdef CONFIG_COMPACTION
701 #define COMPACTION_BUILD 1
702 #else
703 #define COMPACTION_BUILD 0
704 #endif
705 
706 /* This helps us to avoid #ifdef CONFIG_SYMBOL_PREFIX */
707 #ifdef CONFIG_SYMBOL_PREFIX
708 #define SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
709 #else
710 #define SYMBOL_PREFIX ""
711 #endif
712 
713 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
714 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
715 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
716 #endif
717 
718 extern int do_sysinfo(struct sysinfo *info);
719 
720 #endif
721 

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