1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
5 * 'kernel.h' contains some often-used function prototypes etc
7 #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
8 #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
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>
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)
38 #define STACK_MAGIC 0xdeadbeef
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)
45 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
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.
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))
57 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
60 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
61 #define roundup(x, y) ( \
63 const typeof(y) __y = y; \
64 (((x) + (__y - 1)) / __y) * __y; \
67 #define rounddown(x, y) ( \
69 typeof(x) __x = (x); \
73 #define DIV_ROUND_CLOSEST(x, divisor)( \
75 typeof(divisor) __divisor = divisor; \
76 (((x) + ((__divisor) / 2)) / (__divisor)); \
80 #define _RET_IP_ (unsigned long)__builtin_return_address(0)
81 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
84 # include <asm/div64.h>
85 # define sector_div(a, b) do_div(a, b)
87 # define sector_div(n, b)( \
98 * upper_32_bits - return bits 32-63 of a number
99 * @n: the number we're accessing
101 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
102 * the "right shift count >= width of type" warning when that quantity is
105 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
108 * lower_32_bits - return bits 0-31 of a number
109 * @n: the number we're accessing
111 #define lower_32_bits(n) ((u32)(n))
117 #ifdef CONFIG_PREEMPT_VOLUNTARY
118 extern int _cond_resched(void);
119 # define might_resched() _cond_resched()
121 # define might_resched() do { } while (0)
124 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
125 void __might_sleep(const char *file, int line, int preempt_offset);
127 * might_sleep - annotation for functions that can sleep
129 * this macro will print a stack trace if it is executed in an atomic
130 * context (spinlock, irq-handler, ...).
132 * This is a useful debugging help to be able to catch problems early and not
133 * be bitten later when the calling function happens to sleep when it is not
136 # define might_sleep() \
137 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
139 static inline void __might_sleep(const char *file, int line,
140 int preempt_offset) { }
141 # define might_sleep() do { might_resched(); } while (0)
144 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
147 * abs() handles unsigned and signed longs, ints, shorts and chars. For all
148 * input types abs() returns a signed long.
149 * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
154 if (sizeof(x) == sizeof(long)) { \
156 ret = (__x < 0) ? -__x : __x; \
159 ret = (__x < 0) ? -__x : __x; \
164 #define abs64(x) ({ \
166 (__x < 0) ? -__x : __x; \
169 #ifdef CONFIG_PROVE_LOCKING
170 void might_fault(void);
172 static inline void might_fault(void)
178 extern struct atomic_notifier_head panic_notifier_list;
179 extern long (*panic_blink)(int state);
180 NORET_TYPE void panic(const char * fmt, ...)
181 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
182 extern void oops_enter(void);
183 extern void oops_exit(void);
184 void print_oops_end_marker(void);
185 extern int oops_may_print(void);
186 NORET_TYPE void do_exit(long error_code)
188 NORET_TYPE void complete_and_exit(struct completion *, long)
191 /* Internal, do not use. */
192 int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
193 int __must_check _kstrtol(const char *s, unsigned int base, long *res);
195 int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res);
196 int __must_check kstrtoll(const char *s, unsigned int base, long long *res);
197 static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
200 * We want to shortcut function call, but
201 * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
203 if (sizeof(unsigned long) == sizeof(unsigned long long) &&
204 __alignof__(unsigned long) == __alignof__(unsigned long long))
205 return kstrtoull(s, base, (unsigned long long *)res);
207 return _kstrtoul(s, base, res);
210 static inline int __must_check kstrtol(const char *s, unsigned int base, long *res)
213 * We want to shortcut function call, but
214 * __builtin_types_compatible_p(long, long long) = 0.
216 if (sizeof(long) == sizeof(long long) &&
217 __alignof__(long) == __alignof__(long long))
218 return kstrtoll(s, base, (long long *)res);
220 return _kstrtol(s, base, res);
223 int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res);
224 int __must_check kstrtoint(const char *s, unsigned int base, int *res);
226 static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res)
228 return kstrtoull(s, base, res);
231 static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res)
233 return kstrtoll(s, base, res);
236 static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res)
238 return kstrtouint(s, base, res);
241 static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res)
243 return kstrtoint(s, base, res);
246 int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
247 int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
248 int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
249 int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
251 int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
252 int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
253 int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res);
254 int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res);
255 int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res);
256 int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res);
257 int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
258 int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
259 int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
260 int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
262 static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
264 return kstrtoull_from_user(s, count, base, res);
267 static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res)
269 return kstrtoll_from_user(s, count, base, res);
272 static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res)
274 return kstrtouint_from_user(s, count, base, res);
277 static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res)
279 return kstrtoint_from_user(s, count, base, res);
282 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
283 extern long simple_strtol(const char *,char **,unsigned int);
284 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
285 extern long long simple_strtoll(const char *,char **,unsigned int);
286 #define strict_strtoul kstrtoul
287 #define strict_strtol kstrtol
288 #define strict_strtoull kstrtoull
289 #define strict_strtoll kstrtoll
291 extern int sprintf(char * buf, const char * fmt, ...)
292 __attribute__ ((format (printf, 2, 3)));
293 extern int vsprintf(char *buf, const char *, va_list)
294 __attribute__ ((format (printf, 2, 0)));
295 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
296 __attribute__ ((format (printf, 3, 4)));
297 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
298 __attribute__ ((format (printf, 3, 0)));
299 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
300 __attribute__ ((format (printf, 3, 4)));
301 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
302 __attribute__ ((format (printf, 3, 0)));
303 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
304 __attribute__ ((format (printf, 2, 3)));
305 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
307 extern int sscanf(const char *, const char *, ...)
308 __attribute__ ((format (scanf, 2, 3)));
309 extern int vsscanf(const char *, const char *, va_list)
310 __attribute__ ((format (scanf, 2, 0)));
312 extern int get_option(char **str, int *pint);
313 extern char *get_options(const char *str, int nints, int *ints);
314 extern unsigned long long memparse(const char *ptr, char **retptr);
316 extern int core_kernel_text(unsigned long addr);
317 extern int core_kernel_data(unsigned long addr);
318 extern int __kernel_text_address(unsigned long addr);
319 extern int kernel_text_address(unsigned long addr);
320 extern int func_ptr_is_kernel_text(void *ptr);
323 extern struct pid *session_of_pgrp(struct pid *pgrp);
325 unsigned long int_sqrt(unsigned long);
327 extern void bust_spinlocks(int yes);
328 extern void wake_up_klogd(void);
329 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
330 extern int panic_timeout;
331 extern int panic_on_oops;
332 extern int panic_on_unrecovered_nmi;
333 extern int panic_on_io_nmi;
334 extern const char *print_tainted(void);
335 extern void add_taint(unsigned flag);
336 extern int test_taint(unsigned flag);
337 extern unsigned long get_taint(void);
338 extern int root_mountflags;
340 extern bool early_boot_irqs_disabled;
342 /* Values used for system_state */
343 extern enum system_states {
352 #define TAINT_PROPRIETARY_MODULE 0
353 #define TAINT_FORCED_MODULE 1
354 #define TAINT_UNSAFE_SMP 2
355 #define TAINT_FORCED_RMMOD 3
356 #define TAINT_MACHINE_CHECK 4
357 #define TAINT_BAD_PAGE 5
360 #define TAINT_OVERRIDDEN_ACPI_TABLE 8
362 #define TAINT_CRAP 10
363 #define TAINT_FIRMWARE_WORKAROUND 11
365 extern const char hex_asc[];
366 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
367 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
369 static inline char *pack_hex_byte(char *buf, u8 byte)
371 *buf++ = hex_asc_hi(byte);
372 *buf++ = hex_asc_lo(byte);
376 extern int hex_to_bin(char ch);
377 extern void hex2bin(u8 *dst, const char *src, size_t count);
380 * General tracing related utility functions - trace_printk(),
381 * tracing_on/tracing_off and tracing_start()/tracing_stop
383 * Use tracing_on/tracing_off when you want to quickly turn on or off
384 * tracing. It simply enables or disables the recording of the trace events.
385 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
386 * file, which gives a means for the kernel and userspace to interact.
387 * Place a tracing_off() in the kernel where you want tracing to end.
388 * From user space, examine the trace, and then echo 1 > tracing_on
389 * to continue tracing.
391 * tracing_stop/tracing_start has slightly more overhead. It is used
392 * by things like suspend to ram where disabling the recording of the
393 * trace is not enough, but tracing must actually stop because things
394 * like calling smp_processor_id() may crash the system.
396 * Most likely, you want to use tracing_on/tracing_off.
398 #ifdef CONFIG_RING_BUFFER
399 void tracing_on(void);
400 void tracing_off(void);
401 /* trace_off_permanent stops recording with no way to bring it back */
402 void tracing_off_permanent(void);
403 int tracing_is_on(void);
405 static inline void tracing_on(void) { }
406 static inline void tracing_off(void) { }
407 static inline void tracing_off_permanent(void) { }
408 static inline int tracing_is_on(void) { return 0; }
411 enum ftrace_dump_mode {
417 #ifdef CONFIG_TRACING
418 extern void tracing_start(void);
419 extern void tracing_stop(void);
420 extern void ftrace_off_permanent(void);
422 static inline void __attribute__ ((format (printf, 1, 2)))
423 ____trace_printk_check_format(const char *fmt, ...)
426 #define __trace_printk_check_format(fmt, args...) \
429 ____trace_printk_check_format(fmt, ##args); \
433 * trace_printk - printf formatting in the ftrace buffer
434 * @fmt: the printf format for printing
436 * Note: __trace_printk is an internal function for trace_printk and
437 * the @ip is passed in via the trace_printk macro.
439 * This function allows a kernel developer to debug fast path sections
440 * that printk is not appropriate for. By scattering in various
441 * printk like tracing in the code, a developer can quickly see
442 * where problems are occurring.
444 * This is intended as a debugging tool for the developer only.
445 * Please refrain from leaving trace_printks scattered around in
449 #define trace_printk(fmt, args...) \
451 __trace_printk_check_format(fmt, ##args); \
452 if (__builtin_constant_p(fmt)) { \
453 static const char *trace_printk_fmt \
454 __attribute__((section("__trace_printk_fmt"))) = \
455 __builtin_constant_p(fmt) ? fmt : NULL; \
457 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
459 __trace_printk(_THIS_IP_, fmt, ##args); \
463 __trace_bprintk(unsigned long ip, const char *fmt, ...)
464 __attribute__ ((format (printf, 2, 3)));
467 __trace_printk(unsigned long ip, const char *fmt, ...)
468 __attribute__ ((format (printf, 2, 3)));
470 extern void trace_dump_stack(void);
473 * The double __builtin_constant_p is because gcc will give us an error
474 * if we try to allocate the static variable to fmt if it is not a
475 * constant. Even with the outer if statement.
477 #define ftrace_vprintk(fmt, vargs) \
479 if (__builtin_constant_p(fmt)) { \
480 static const char *trace_printk_fmt \
481 __attribute__((section("__trace_printk_fmt"))) = \
482 __builtin_constant_p(fmt) ? fmt : NULL; \
484 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
486 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
490 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
493 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
495 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
498 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
500 static inline void tracing_start(void) { }
501 static inline void tracing_stop(void) { }
502 static inline void ftrace_off_permanent(void) { }
503 static inline void trace_dump_stack(void) { }
505 trace_printk(const char *fmt, ...)
510 ftrace_vprintk(const char *fmt, va_list ap)
514 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
515 #endif /* CONFIG_TRACING */
518 * min()/max()/clamp() macros that also do
519 * strict type-checking.. See the
520 * "unnecessary" pointer comparison.
522 #define min(x, y) ({ \
523 typeof(x) _min1 = (x); \
524 typeof(y) _min2 = (y); \
525 (void) (&_min1 == &_min2); \
526 _min1 < _min2 ? _min1 : _min2; })
528 #define max(x, y) ({ \
529 typeof(x) _max1 = (x); \
530 typeof(y) _max2 = (y); \
531 (void) (&_max1 == &_max2); \
532 _max1 > _max2 ? _max1 : _max2; })
534 #define min3(x, y, z) ({ \
535 typeof(x) _min1 = (x); \
536 typeof(y) _min2 = (y); \
537 typeof(z) _min3 = (z); \
538 (void) (&_min1 == &_min2); \
539 (void) (&_min1 == &_min3); \
540 _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
541 (_min2 < _min3 ? _min2 : _min3); })
543 #define max3(x, y, z) ({ \
544 typeof(x) _max1 = (x); \
545 typeof(y) _max2 = (y); \
546 typeof(z) _max3 = (z); \
547 (void) (&_max1 == &_max2); \
548 (void) (&_max1 == &_max3); \
549 _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
550 (_max2 > _max3 ? _max2 : _max3); })
553 * min_not_zero - return the minimum that is _not_ zero, unless both are zero
557 #define min_not_zero(x, y) ({ \
558 typeof(x) __x = (x); \
559 typeof(y) __y = (y); \
560 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
563 * clamp - return a value clamped to a given range with strict typechecking
564 * @val: current value
565 * @min: minimum allowable value
566 * @max: maximum allowable value
568 * This macro does strict typechecking of min/max to make sure they are of the
569 * same type as val. See the unnecessary pointer comparisons.
571 #define clamp(val, min, max) ({ \
572 typeof(val) __val = (val); \
573 typeof(min) __min = (min); \
574 typeof(max) __max = (max); \
575 (void) (&__val == &__min); \
576 (void) (&__val == &__max); \
577 __val = __val < __min ? __min: __val; \
578 __val > __max ? __max: __val; })
581 * ..and if you can't take the strict
582 * types, you can specify one yourself.
584 * Or not use min/max/clamp at all, of course.
586 #define min_t(type, x, y) ({ \
589 __min1 < __min2 ? __min1: __min2; })
591 #define max_t(type, x, y) ({ \
594 __max1 > __max2 ? __max1: __max2; })
597 * clamp_t - return a value clamped to a given range using a given type
598 * @type: the type of variable to use
599 * @val: current value
600 * @min: minimum allowable value
601 * @max: maximum allowable value
603 * This macro does no typechecking and uses temporary variables of type
604 * 'type' to make all the comparisons.
606 #define clamp_t(type, val, min, max) ({ \
607 type __val = (val); \
608 type __min = (min); \
609 type __max = (max); \
610 __val = __val < __min ? __min: __val; \
611 __val > __max ? __max: __val; })
614 * clamp_val - return a value clamped to a given range using val's type
615 * @val: current value
616 * @min: minimum allowable value
617 * @max: maximum allowable value
619 * This macro does no typechecking and uses temporary variables of whatever
620 * type the input argument 'val' is. This is useful when val is an unsigned
621 * type and min and max are literals that will otherwise be assigned a signed
624 #define clamp_val(val, min, max) ({ \
625 typeof(val) __val = (val); \
626 typeof(val) __min = (min); \
627 typeof(val) __max = (max); \
628 __val = __val < __min ? __min: __val; \
629 __val > __max ? __max: __val; })
633 * swap - swap value of @a and @b
636 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
639 * container_of - cast a member of a structure out to the containing structure
640 * @ptr: the pointer to the member.
641 * @type: the type of the container struct this is embedded in.
642 * @member: the name of the member within the struct.
645 #define container_of(ptr, type, member) ({ \
646 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
647 (type *)( (char *)__mptr - offsetof(type,member) );})
650 extern int do_sysinfo(struct sysinfo *info);
652 #endif /* __KERNEL__ */
654 #define SI_LOAD_SHIFT 16
656 long uptime; /* Seconds since boot */
657 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
658 unsigned long totalram; /* Total usable main memory size */
659 unsigned long freeram; /* Available memory size */
660 unsigned long sharedram; /* Amount of shared memory */
661 unsigned long bufferram; /* Memory used by buffers */
662 unsigned long totalswap; /* Total swap space size */
663 unsigned long freeswap; /* swap space still available */
664 unsigned short procs; /* Number of current processes */
665 unsigned short pad; /* explicit padding for m68k */
666 unsigned long totalhigh; /* Total high memory size */
667 unsigned long freehigh; /* Available high memory size */
668 unsigned int mem_unit; /* Memory unit size in bytes */
669 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
673 #define BUILD_BUG_ON_NOT_POWER_OF_2(n)
674 #define BUILD_BUG_ON_ZERO(e) (0)
675 #define BUILD_BUG_ON_NULL(e) ((void*)0)
676 #define BUILD_BUG_ON(condition)
677 #else /* __CHECKER__ */
679 /* Force a compilation error if a constant expression is not a power of 2 */
680 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
681 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
683 /* Force a compilation error if condition is true, but also produce a
684 result (of value 0 and type size_t), so the expression can be used
685 e.g. in a structure initializer (or where-ever else comma expressions
686 aren't permitted). */
687 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
688 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
691 * BUILD_BUG_ON - break compile if a condition is true.
692 * @condition: the condition which the compiler should know is false.
694 * If you have some code which relies on certain constants being equal, or
695 * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
696 * detect if someone changes it.
698 * The implementation uses gcc's reluctance to create a negative array, but
699 * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
700 * to inline functions). So as a fallback we use the optimizer; if it can't
701 * prove the condition is false, it will cause a link error on the undefined
702 * "__build_bug_on_failed". This error message can be harder to track down
703 * though, hence the two different methods.
706 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
708 extern int __build_bug_on_failed;
709 #define BUILD_BUG_ON(condition) \
711 ((void)sizeof(char[1 - 2*!!(condition)])); \
712 if (condition) __build_bug_on_failed = 1; \
715 #endif /* __CHECKER__ */
717 /* Trap pasters of __FUNCTION__ at compile-time */
718 #define __FUNCTION__ (__func__)
720 /* This helps us to avoid #ifdef CONFIG_NUMA */
727 /* This helps us avoid #ifdef CONFIG_COMPACTION */
728 #ifdef CONFIG_COMPACTION
729 #define COMPACTION_BUILD 1
731 #define COMPACTION_BUILD 0
734 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
735 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
736 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
739 /* To identify board information in panic logs, set this */
740 extern char *mach_panic_string;