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))
59 #define DIV_ROUND_UP_ULL(ll,d) \
60 ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
62 #if BITS_PER_LONG == 32
63 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
65 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
68 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
69 #define roundup(x, y) ( \
71 const typeof(y) __y = y; \
72 (((x) + (__y - 1)) / __y) * __y; \
75 #define rounddown(x, y) ( \
77 typeof(x) __x = (x); \
81 #define DIV_ROUND_CLOSEST(x, divisor)( \
83 typeof(divisor) __divisor = divisor; \
84 (((x) + ((__divisor) / 2)) / (__divisor)); \
89 * Multiplies an integer by a fraction, while avoiding unnecessary
90 * overflow or loss of precision.
92 #define mult_frac(x, numer, denom)( \
94 typeof(x) quot = (x) / (denom); \
95 typeof(x) rem = (x) % (denom); \
96 (quot * (numer)) + ((rem * (numer)) / (denom)); \
101 #define _RET_IP_ (unsigned long)__builtin_return_address(0)
102 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
105 # include <asm/div64.h>
106 # define sector_div(a, b) do_div(a, b)
108 # define sector_div(n, b)( \
119 * upper_32_bits - return bits 32-63 of a number
120 * @n: the number we're accessing
122 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
123 * the "right shift count >= width of type" warning when that quantity is
126 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
129 * lower_32_bits - return bits 0-31 of a number
130 * @n: the number we're accessing
132 #define lower_32_bits(n) ((u32)(n))
138 #ifdef CONFIG_PREEMPT_VOLUNTARY
139 extern int _cond_resched(void);
140 # define might_resched() _cond_resched()
142 # define might_resched() do { } while (0)
145 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
146 void __might_sleep(const char *file, int line, int preempt_offset);
148 * might_sleep - annotation for functions that can sleep
150 * this macro will print a stack trace if it is executed in an atomic
151 * context (spinlock, irq-handler, ...).
153 * This is a useful debugging help to be able to catch problems early and not
154 * be bitten later when the calling function happens to sleep when it is not
157 # define might_sleep() \
158 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
160 static inline void __might_sleep(const char *file, int line,
161 int preempt_offset) { }
162 # define might_sleep() do { might_resched(); } while (0)
165 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
168 * abs() handles unsigned and signed longs, ints, shorts and chars. For all
169 * input types abs() returns a signed long.
170 * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
175 if (sizeof(x) == sizeof(long)) { \
177 ret = (__x < 0) ? -__x : __x; \
180 ret = (__x < 0) ? -__x : __x; \
185 #define abs64(x) ({ \
187 (__x < 0) ? -__x : __x; \
190 #ifdef CONFIG_PROVE_LOCKING
191 void might_fault(void);
193 static inline void might_fault(void)
199 extern struct atomic_notifier_head panic_notifier_list;
200 extern long (*panic_blink)(int state);
202 void panic(const char *fmt, ...)
204 extern void oops_enter(void);
205 extern void oops_exit(void);
206 void print_oops_end_marker(void);
207 extern int oops_may_print(void);
208 void do_exit(long error_code)
210 void complete_and_exit(struct completion *, long)
213 /* Internal, do not use. */
214 int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
215 int __must_check _kstrtol(const char *s, unsigned int base, long *res);
217 int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res);
218 int __must_check kstrtoll(const char *s, unsigned int base, long long *res);
219 static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
222 * We want to shortcut function call, but
223 * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
225 if (sizeof(unsigned long) == sizeof(unsigned long long) &&
226 __alignof__(unsigned long) == __alignof__(unsigned long long))
227 return kstrtoull(s, base, (unsigned long long *)res);
229 return _kstrtoul(s, base, res);
232 static inline int __must_check kstrtol(const char *s, unsigned int base, long *res)
235 * We want to shortcut function call, but
236 * __builtin_types_compatible_p(long, long long) = 0.
238 if (sizeof(long) == sizeof(long long) &&
239 __alignof__(long) == __alignof__(long long))
240 return kstrtoll(s, base, (long long *)res);
242 return _kstrtol(s, base, res);
245 int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res);
246 int __must_check kstrtoint(const char *s, unsigned int base, int *res);
248 static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res)
250 return kstrtoull(s, base, res);
253 static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res)
255 return kstrtoll(s, base, res);
258 static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res)
260 return kstrtouint(s, base, res);
263 static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res)
265 return kstrtoint(s, base, res);
268 int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
269 int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
270 int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
271 int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
273 int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
274 int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
275 int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res);
276 int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res);
277 int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res);
278 int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res);
279 int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
280 int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
281 int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
282 int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
284 static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
286 return kstrtoull_from_user(s, count, base, res);
289 static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res)
291 return kstrtoll_from_user(s, count, base, res);
294 static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res)
296 return kstrtouint_from_user(s, count, base, res);
299 static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res)
301 return kstrtoint_from_user(s, count, base, res);
304 /* Obsolete, do not use. Use kstrto<foo> instead */
306 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
307 extern long simple_strtol(const char *,char **,unsigned int);
308 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
309 extern long long simple_strtoll(const char *,char **,unsigned int);
310 #define strict_strtoul kstrtoul
311 #define strict_strtol kstrtol
312 #define strict_strtoull kstrtoull
313 #define strict_strtoll kstrtoll
315 /* lib/printf utilities */
317 extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
318 extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list);
319 extern __printf(3, 4)
320 int snprintf(char *buf, size_t size, const char *fmt, ...);
321 extern __printf(3, 0)
322 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
323 extern __printf(3, 4)
324 int scnprintf(char *buf, size_t size, const char *fmt, ...);
325 extern __printf(3, 0)
326 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
327 extern __printf(2, 3)
328 char *kasprintf(gfp_t gfp, const char *fmt, ...);
329 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
331 extern int sscanf(const char *, const char *, ...)
332 __attribute__ ((format (scanf, 2, 3)));
333 extern int vsscanf(const char *, const char *, va_list)
334 __attribute__ ((format (scanf, 2, 0)));
336 extern int get_option(char **str, int *pint);
337 extern char *get_options(const char *str, int nints, int *ints);
338 extern unsigned long long memparse(const char *ptr, char **retptr);
340 extern int core_kernel_text(unsigned long addr);
341 extern int core_kernel_data(unsigned long addr);
342 extern int __kernel_text_address(unsigned long addr);
343 extern int kernel_text_address(unsigned long addr);
344 extern int func_ptr_is_kernel_text(void *ptr);
347 extern struct pid *session_of_pgrp(struct pid *pgrp);
349 unsigned long int_sqrt(unsigned long);
351 extern void bust_spinlocks(int yes);
352 extern void wake_up_klogd(void);
353 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
354 extern int panic_timeout;
355 extern int panic_on_oops;
356 extern int panic_on_unrecovered_nmi;
357 extern int panic_on_io_nmi;
358 extern int sysctl_panic_on_stackoverflow;
359 extern const char *print_tainted(void);
360 extern void add_taint(unsigned flag);
361 extern int test_taint(unsigned flag);
362 extern unsigned long get_taint(void);
363 extern int root_mountflags;
365 extern bool early_boot_irqs_disabled;
367 /* Values used for system_state */
368 extern enum system_states {
377 #define TAINT_PROPRIETARY_MODULE 0
378 #define TAINT_FORCED_MODULE 1
379 #define TAINT_UNSAFE_SMP 2
380 #define TAINT_FORCED_RMMOD 3
381 #define TAINT_MACHINE_CHECK 4
382 #define TAINT_BAD_PAGE 5
385 #define TAINT_OVERRIDDEN_ACPI_TABLE 8
387 #define TAINT_CRAP 10
388 #define TAINT_FIRMWARE_WORKAROUND 11
389 #define TAINT_OOT_MODULE 12
391 extern const char hex_asc[];
392 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
393 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
395 static inline char *hex_byte_pack(char *buf, u8 byte)
397 *buf++ = hex_asc_hi(byte);
398 *buf++ = hex_asc_lo(byte);
402 static inline char * __deprecated pack_hex_byte(char *buf, u8 byte)
404 return hex_byte_pack(buf, byte);
407 extern int hex_to_bin(char ch);
408 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
411 * General tracing related utility functions - trace_printk(),
412 * tracing_on/tracing_off and tracing_start()/tracing_stop
414 * Use tracing_on/tracing_off when you want to quickly turn on or off
415 * tracing. It simply enables or disables the recording of the trace events.
416 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
417 * file, which gives a means for the kernel and userspace to interact.
418 * Place a tracing_off() in the kernel where you want tracing to end.
419 * From user space, examine the trace, and then echo 1 > tracing_on
420 * to continue tracing.
422 * tracing_stop/tracing_start has slightly more overhead. It is used
423 * by things like suspend to ram where disabling the recording of the
424 * trace is not enough, but tracing must actually stop because things
425 * like calling smp_processor_id() may crash the system.
427 * Most likely, you want to use tracing_on/tracing_off.
429 #ifdef CONFIG_RING_BUFFER
430 void tracing_on(void);
431 void tracing_off(void);
432 /* trace_off_permanent stops recording with no way to bring it back */
433 void tracing_off_permanent(void);
434 int tracing_is_on(void);
436 static inline void tracing_on(void) { }
437 static inline void tracing_off(void) { }
438 static inline void tracing_off_permanent(void) { }
439 static inline int tracing_is_on(void) { return 0; }
442 enum ftrace_dump_mode {
448 #ifdef CONFIG_TRACING
449 extern void tracing_start(void);
450 extern void tracing_stop(void);
451 extern void ftrace_off_permanent(void);
453 static inline __printf(1, 2)
454 void ____trace_printk_check_format(const char *fmt, ...)
457 #define __trace_printk_check_format(fmt, args...) \
460 ____trace_printk_check_format(fmt, ##args); \
464 * trace_printk - printf formatting in the ftrace buffer
465 * @fmt: the printf format for printing
467 * Note: __trace_printk is an internal function for trace_printk and
468 * the @ip is passed in via the trace_printk macro.
470 * This function allows a kernel developer to debug fast path sections
471 * that printk is not appropriate for. By scattering in various
472 * printk like tracing in the code, a developer can quickly see
473 * where problems are occurring.
475 * This is intended as a debugging tool for the developer only.
476 * Please refrain from leaving trace_printks scattered around in
480 #define trace_printk(fmt, args...) \
482 __trace_printk_check_format(fmt, ##args); \
483 if (__builtin_constant_p(fmt)) { \
484 static const char *trace_printk_fmt \
485 __attribute__((section("__trace_printk_fmt"))) = \
486 __builtin_constant_p(fmt) ? fmt : NULL; \
488 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
490 __trace_printk(_THIS_IP_, fmt, ##args); \
493 extern __printf(2, 3)
494 int __trace_bprintk(unsigned long ip, const char *fmt, ...);
496 extern __printf(2, 3)
497 int __trace_printk(unsigned long ip, const char *fmt, ...);
499 extern void trace_dump_stack(void);
502 * The double __builtin_constant_p is because gcc will give us an error
503 * if we try to allocate the static variable to fmt if it is not a
504 * constant. Even with the outer if statement.
506 #define ftrace_vprintk(fmt, vargs) \
508 if (__builtin_constant_p(fmt)) { \
509 static const char *trace_printk_fmt \
510 __attribute__((section("__trace_printk_fmt"))) = \
511 __builtin_constant_p(fmt) ? fmt : NULL; \
513 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
515 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
519 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
522 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
524 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
526 static inline __printf(1, 2)
527 int trace_printk(const char *fmt, ...);
529 static inline void tracing_start(void) { }
530 static inline void tracing_stop(void) { }
531 static inline void ftrace_off_permanent(void) { }
532 static inline void trace_dump_stack(void) { }
534 trace_printk(const char *fmt, ...)
539 ftrace_vprintk(const char *fmt, va_list ap)
543 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
544 #endif /* CONFIG_TRACING */
547 * min()/max()/clamp() macros that also do
548 * strict type-checking.. See the
549 * "unnecessary" pointer comparison.
551 #define min(x, y) ({ \
552 typeof(x) _min1 = (x); \
553 typeof(y) _min2 = (y); \
554 (void) (&_min1 == &_min2); \
555 _min1 < _min2 ? _min1 : _min2; })
557 #define max(x, y) ({ \
558 typeof(x) _max1 = (x); \
559 typeof(y) _max2 = (y); \
560 (void) (&_max1 == &_max2); \
561 _max1 > _max2 ? _max1 : _max2; })
563 #define min3(x, y, z) ({ \
564 typeof(x) _min1 = (x); \
565 typeof(y) _min2 = (y); \
566 typeof(z) _min3 = (z); \
567 (void) (&_min1 == &_min2); \
568 (void) (&_min1 == &_min3); \
569 _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
570 (_min2 < _min3 ? _min2 : _min3); })
572 #define max3(x, y, z) ({ \
573 typeof(x) _max1 = (x); \
574 typeof(y) _max2 = (y); \
575 typeof(z) _max3 = (z); \
576 (void) (&_max1 == &_max2); \
577 (void) (&_max1 == &_max3); \
578 _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
579 (_max2 > _max3 ? _max2 : _max3); })
582 * min_not_zero - return the minimum that is _not_ zero, unless both are zero
586 #define min_not_zero(x, y) ({ \
587 typeof(x) __x = (x); \
588 typeof(y) __y = (y); \
589 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
592 * clamp - return a value clamped to a given range with strict typechecking
593 * @val: current value
594 * @min: minimum allowable value
595 * @max: maximum allowable value
597 * This macro does strict typechecking of min/max to make sure they are of the
598 * same type as val. See the unnecessary pointer comparisons.
600 #define clamp(val, min, max) ({ \
601 typeof(val) __val = (val); \
602 typeof(min) __min = (min); \
603 typeof(max) __max = (max); \
604 (void) (&__val == &__min); \
605 (void) (&__val == &__max); \
606 __val = __val < __min ? __min: __val; \
607 __val > __max ? __max: __val; })
610 * ..and if you can't take the strict
611 * types, you can specify one yourself.
613 * Or not use min/max/clamp at all, of course.
615 #define min_t(type, x, y) ({ \
618 __min1 < __min2 ? __min1: __min2; })
620 #define max_t(type, x, y) ({ \
623 __max1 > __max2 ? __max1: __max2; })
626 * clamp_t - return a value clamped to a given range using a given type
627 * @type: the type of variable to use
628 * @val: current value
629 * @min: minimum allowable value
630 * @max: maximum allowable value
632 * This macro does no typechecking and uses temporary variables of type
633 * 'type' to make all the comparisons.
635 #define clamp_t(type, val, min, max) ({ \
636 type __val = (val); \
637 type __min = (min); \
638 type __max = (max); \
639 __val = __val < __min ? __min: __val; \
640 __val > __max ? __max: __val; })
643 * clamp_val - return a value clamped to a given range using val's type
644 * @val: current value
645 * @min: minimum allowable value
646 * @max: maximum allowable value
648 * This macro does no typechecking and uses temporary variables of whatever
649 * type the input argument 'val' is. This is useful when val is an unsigned
650 * type and min and max are literals that will otherwise be assigned a signed
653 #define clamp_val(val, min, max) ({ \
654 typeof(val) __val = (val); \
655 typeof(val) __min = (min); \
656 typeof(val) __max = (max); \
657 __val = __val < __min ? __min: __val; \
658 __val > __max ? __max: __val; })
662 * swap - swap value of @a and @b
665 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
668 * container_of - cast a member of a structure out to the containing structure
669 * @ptr: the pointer to the member.
670 * @type: the type of the container struct this is embedded in.
671 * @member: the name of the member within the struct.
674 #define container_of(ptr, type, member) ({ \
675 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
676 (type *)( (char *)__mptr - offsetof(type,member) );})
679 #define BUILD_BUG_ON_NOT_POWER_OF_2(n)
680 #define BUILD_BUG_ON_ZERO(e) (0)
681 #define BUILD_BUG_ON_NULL(e) ((void*)0)
682 #define BUILD_BUG_ON(condition)
683 #define BUILD_BUG() (0)
684 #else /* __CHECKER__ */
686 /* Force a compilation error if a constant expression is not a power of 2 */
687 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
688 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
690 /* Force a compilation error if condition is true, but also produce a
691 result (of value 0 and type size_t), so the expression can be used
692 e.g. in a structure initializer (or where-ever else comma expressions
693 aren't permitted). */
694 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
695 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
698 * BUILD_BUG_ON - break compile if a condition is true.
699 * @condition: the condition which the compiler should know is false.
701 * If you have some code which relies on certain constants being equal, or
702 * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
703 * detect if someone changes it.
705 * The implementation uses gcc's reluctance to create a negative array, but
706 * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
707 * to inline functions). So as a fallback we use the optimizer; if it can't
708 * prove the condition is false, it will cause a link error on the undefined
709 * "__build_bug_on_failed". This error message can be harder to track down
710 * though, hence the two different methods.
713 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
715 extern int __build_bug_on_failed;
716 #define BUILD_BUG_ON(condition) \
718 ((void)sizeof(char[1 - 2*!!(condition)])); \
719 if (condition) __build_bug_on_failed = 1; \
724 * BUILD_BUG - break compile if used.
726 * If you have some code that you expect the compiler to eliminate at
727 * build time, you should use BUILD_BUG to detect if it is
730 #define BUILD_BUG() \
732 extern void __build_bug_failed(void) \
733 __linktime_error("BUILD_BUG failed"); \
734 __build_bug_failed(); \
737 #endif /* __CHECKER__ */
739 /* Trap pasters of __FUNCTION__ at compile-time */
740 #define __FUNCTION__ (__func__)
742 /* This helps us to avoid #ifdef CONFIG_NUMA */
749 /* This helps us avoid #ifdef CONFIG_COMPACTION */
750 #ifdef CONFIG_COMPACTION
751 #define COMPACTION_BUILD 1
753 #define COMPACTION_BUILD 0
756 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
757 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
758 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
762 extern int do_sysinfo(struct sysinfo *info);
764 #endif /* __KERNEL__ */
766 #define SI_LOAD_SHIFT 16
768 long uptime; /* Seconds since boot */
769 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
770 unsigned long totalram; /* Total usable main memory size */
771 unsigned long freeram; /* Available memory size */
772 unsigned long sharedram; /* Amount of shared memory */
773 unsigned long bufferram; /* Memory used by buffers */
774 unsigned long totalswap; /* Total swap space size */
775 unsigned long freeswap; /* swap space still available */
776 unsigned short procs; /* Number of current processes */
777 unsigned short pad; /* explicit padding for m68k */
778 unsigned long totalhigh; /* Total high memory size */
779 unsigned long freehigh; /* Available high memory size */
780 unsigned int mem_unit; /* Memory unit size in bytes */
781 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */