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)
37 #define SIZE_MAX (~(size_t)0)
39 #define STACK_MAGIC 0xdeadbeef
41 #define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
42 #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask))
43 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
44 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
46 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
49 * This looks more complex than it should be. But we need to
50 * get the type for the ~ right in round_down (it needs to be
51 * as wide as the result!), and we want to evaluate the macro
52 * arguments just once each.
54 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
55 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
56 #define round_down(x, y) ((x) & ~__round_mask(x, y))
58 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
59 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
60 #define DIV_ROUND_UP_ULL(ll,d) \
61 ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
63 #if BITS_PER_LONG == 32
64 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
66 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
69 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
70 #define roundup(x, y) ( \
72 const typeof(y) __y = y; \
73 (((x) + (__y - 1)) / __y) * __y; \
76 #define rounddown(x, y) ( \
78 typeof(x) __x = (x); \
82 #define DIV_ROUND_CLOSEST(x, divisor)( \
84 typeof(divisor) __divisor = divisor; \
85 (((x) + ((__divisor) / 2)) / (__divisor)); \
90 * Multiplies an integer by a fraction, while avoiding unnecessary
91 * overflow or loss of precision.
93 #define mult_frac(x, numer, denom)( \
95 typeof(x) quot = (x) / (denom); \
96 typeof(x) rem = (x) % (denom); \
97 (quot * (numer)) + ((rem * (numer)) / (denom)); \
102 #define _RET_IP_ (unsigned long)__builtin_return_address(0)
103 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
106 # include <asm/div64.h>
107 # define sector_div(a, b) do_div(a, b)
109 # define sector_div(n, b)( \
120 * upper_32_bits - return bits 32-63 of a number
121 * @n: the number we're accessing
123 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
124 * the "right shift count >= width of type" warning when that quantity is
127 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
130 * lower_32_bits - return bits 0-31 of a number
131 * @n: the number we're accessing
133 #define lower_32_bits(n) ((u32)(n))
139 #ifdef CONFIG_PREEMPT_VOLUNTARY
140 extern int _cond_resched(void);
141 # define might_resched() _cond_resched()
143 # define might_resched() do { } while (0)
146 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
147 void __might_sleep(const char *file, int line, int preempt_offset);
149 * might_sleep - annotation for functions that can sleep
151 * this macro will print a stack trace if it is executed in an atomic
152 * context (spinlock, irq-handler, ...).
154 * This is a useful debugging help to be able to catch problems early and not
155 * be bitten later when the calling function happens to sleep when it is not
158 # define might_sleep() \
159 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
161 static inline void __might_sleep(const char *file, int line,
162 int preempt_offset) { }
163 # define might_sleep() do { might_resched(); } while (0)
166 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
169 * abs() handles unsigned and signed longs, ints, shorts and chars. For all
170 * input types abs() returns a signed long.
171 * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
176 if (sizeof(x) == sizeof(long)) { \
178 ret = (__x < 0) ? -__x : __x; \
181 ret = (__x < 0) ? -__x : __x; \
186 #define abs64(x) ({ \
188 (__x < 0) ? -__x : __x; \
191 #ifdef CONFIG_PROVE_LOCKING
192 void might_fault(void);
194 static inline void might_fault(void)
200 extern struct atomic_notifier_head panic_notifier_list;
201 extern long (*panic_blink)(int state);
202 NORET_TYPE void panic(const char * fmt, ...)
203 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
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 NORET_TYPE void do_exit(long error_code)
210 NORET_TYPE 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 const char *print_tainted(void);
359 extern void add_taint(unsigned flag);
360 extern int test_taint(unsigned flag);
361 extern unsigned long get_taint(void);
362 extern int root_mountflags;
364 extern bool early_boot_irqs_disabled;
366 /* Values used for system_state */
367 extern enum system_states {
376 #define TAINT_PROPRIETARY_MODULE 0
377 #define TAINT_FORCED_MODULE 1
378 #define TAINT_UNSAFE_SMP 2
379 #define TAINT_FORCED_RMMOD 3
380 #define TAINT_MACHINE_CHECK 4
381 #define TAINT_BAD_PAGE 5
384 #define TAINT_OVERRIDDEN_ACPI_TABLE 8
386 #define TAINT_CRAP 10
387 #define TAINT_FIRMWARE_WORKAROUND 11
388 #define TAINT_OOT_MODULE 12
390 extern const char hex_asc[];
391 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
392 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
394 static inline char *hex_byte_pack(char *buf, u8 byte)
396 *buf++ = hex_asc_hi(byte);
397 *buf++ = hex_asc_lo(byte);
401 static inline char * __deprecated pack_hex_byte(char *buf, u8 byte)
403 return hex_byte_pack(buf, byte);
406 extern int hex_to_bin(char ch);
407 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
410 * General tracing related utility functions - trace_printk(),
411 * tracing_on/tracing_off and tracing_start()/tracing_stop
413 * Use tracing_on/tracing_off when you want to quickly turn on or off
414 * tracing. It simply enables or disables the recording of the trace events.
415 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
416 * file, which gives a means for the kernel and userspace to interact.
417 * Place a tracing_off() in the kernel where you want tracing to end.
418 * From user space, examine the trace, and then echo 1 > tracing_on
419 * to continue tracing.
421 * tracing_stop/tracing_start has slightly more overhead. It is used
422 * by things like suspend to ram where disabling the recording of the
423 * trace is not enough, but tracing must actually stop because things
424 * like calling smp_processor_id() may crash the system.
426 * Most likely, you want to use tracing_on/tracing_off.
428 #ifdef CONFIG_RING_BUFFER
429 void tracing_on(void);
430 void tracing_off(void);
431 /* trace_off_permanent stops recording with no way to bring it back */
432 void tracing_off_permanent(void);
433 int tracing_is_on(void);
435 static inline void tracing_on(void) { }
436 static inline void tracing_off(void) { }
437 static inline void tracing_off_permanent(void) { }
438 static inline int tracing_is_on(void) { return 0; }
441 enum ftrace_dump_mode {
447 #ifdef CONFIG_TRACING
448 extern void tracing_start(void);
449 extern void tracing_stop(void);
450 extern void ftrace_off_permanent(void);
452 static inline __printf(1, 2)
453 void ____trace_printk_check_format(const char *fmt, ...)
456 #define __trace_printk_check_format(fmt, args...) \
459 ____trace_printk_check_format(fmt, ##args); \
463 * trace_printk - printf formatting in the ftrace buffer
464 * @fmt: the printf format for printing
466 * Note: __trace_printk is an internal function for trace_printk and
467 * the @ip is passed in via the trace_printk macro.
469 * This function allows a kernel developer to debug fast path sections
470 * that printk is not appropriate for. By scattering in various
471 * printk like tracing in the code, a developer can quickly see
472 * where problems are occurring.
474 * This is intended as a debugging tool for the developer only.
475 * Please refrain from leaving trace_printks scattered around in
479 #define trace_printk(fmt, args...) \
481 __trace_printk_check_format(fmt, ##args); \
482 if (__builtin_constant_p(fmt)) { \
483 static const char *trace_printk_fmt \
484 __attribute__((section("__trace_printk_fmt"))) = \
485 __builtin_constant_p(fmt) ? fmt : NULL; \
487 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
489 __trace_printk(_THIS_IP_, fmt, ##args); \
492 extern __printf(2, 3)
493 int __trace_bprintk(unsigned long ip, const char *fmt, ...);
495 extern __printf(2, 3)
496 int __trace_printk(unsigned long ip, const char *fmt, ...);
498 extern void trace_dump_stack(void);
501 * The double __builtin_constant_p is because gcc will give us an error
502 * if we try to allocate the static variable to fmt if it is not a
503 * constant. Even with the outer if statement.
505 #define ftrace_vprintk(fmt, vargs) \
507 if (__builtin_constant_p(fmt)) { \
508 static const char *trace_printk_fmt \
509 __attribute__((section("__trace_printk_fmt"))) = \
510 __builtin_constant_p(fmt) ? fmt : NULL; \
512 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
514 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
518 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
521 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
523 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
525 static inline __printf(1, 2)
526 int trace_printk(const char *fmt, ...);
528 static inline void tracing_start(void) { }
529 static inline void tracing_stop(void) { }
530 static inline void ftrace_off_permanent(void) { }
531 static inline void trace_dump_stack(void) { }
533 trace_printk(const char *fmt, ...)
538 ftrace_vprintk(const char *fmt, va_list ap)
542 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
543 #endif /* CONFIG_TRACING */
546 * min()/max()/clamp() macros that also do
547 * strict type-checking.. See the
548 * "unnecessary" pointer comparison.
550 #define min(x, y) ({ \
551 typeof(x) _min1 = (x); \
552 typeof(y) _min2 = (y); \
553 (void) (&_min1 == &_min2); \
554 _min1 < _min2 ? _min1 : _min2; })
556 #define max(x, y) ({ \
557 typeof(x) _max1 = (x); \
558 typeof(y) _max2 = (y); \
559 (void) (&_max1 == &_max2); \
560 _max1 > _max2 ? _max1 : _max2; })
562 #define min3(x, y, z) ({ \
563 typeof(x) _min1 = (x); \
564 typeof(y) _min2 = (y); \
565 typeof(z) _min3 = (z); \
566 (void) (&_min1 == &_min2); \
567 (void) (&_min1 == &_min3); \
568 _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
569 (_min2 < _min3 ? _min2 : _min3); })
571 #define max3(x, y, z) ({ \
572 typeof(x) _max1 = (x); \
573 typeof(y) _max2 = (y); \
574 typeof(z) _max3 = (z); \
575 (void) (&_max1 == &_max2); \
576 (void) (&_max1 == &_max3); \
577 _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
578 (_max2 > _max3 ? _max2 : _max3); })
581 * min_not_zero - return the minimum that is _not_ zero, unless both are zero
585 #define min_not_zero(x, y) ({ \
586 typeof(x) __x = (x); \
587 typeof(y) __y = (y); \
588 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
591 * clamp - return a value clamped to a given range with strict typechecking
592 * @val: current value
593 * @min: minimum allowable value
594 * @max: maximum allowable value
596 * This macro does strict typechecking of min/max to make sure they are of the
597 * same type as val. See the unnecessary pointer comparisons.
599 #define clamp(val, min, max) ({ \
600 typeof(val) __val = (val); \
601 typeof(min) __min = (min); \
602 typeof(max) __max = (max); \
603 (void) (&__val == &__min); \
604 (void) (&__val == &__max); \
605 __val = __val < __min ? __min: __val; \
606 __val > __max ? __max: __val; })
609 * ..and if you can't take the strict
610 * types, you can specify one yourself.
612 * Or not use min/max/clamp at all, of course.
614 #define min_t(type, x, y) ({ \
617 __min1 < __min2 ? __min1: __min2; })
619 #define max_t(type, x, y) ({ \
622 __max1 > __max2 ? __max1: __max2; })
625 * clamp_t - return a value clamped to a given range using a given type
626 * @type: the type of variable to use
627 * @val: current value
628 * @min: minimum allowable value
629 * @max: maximum allowable value
631 * This macro does no typechecking and uses temporary variables of type
632 * 'type' to make all the comparisons.
634 #define clamp_t(type, val, min, max) ({ \
635 type __val = (val); \
636 type __min = (min); \
637 type __max = (max); \
638 __val = __val < __min ? __min: __val; \
639 __val > __max ? __max: __val; })
642 * clamp_val - return a value clamped to a given range using val's type
643 * @val: current value
644 * @min: minimum allowable value
645 * @max: maximum allowable value
647 * This macro does no typechecking and uses temporary variables of whatever
648 * type the input argument 'val' is. This is useful when val is an unsigned
649 * type and min and max are literals that will otherwise be assigned a signed
652 #define clamp_val(val, min, max) ({ \
653 typeof(val) __val = (val); \
654 typeof(val) __min = (min); \
655 typeof(val) __max = (max); \
656 __val = __val < __min ? __min: __val; \
657 __val > __max ? __max: __val; })
661 * swap - swap value of @a and @b
664 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
667 * container_of - cast a member of a structure out to the containing structure
668 * @ptr: the pointer to the member.
669 * @type: the type of the container struct this is embedded in.
670 * @member: the name of the member within the struct.
673 #define container_of(ptr, type, member) ({ \
674 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
675 (type *)( (char *)__mptr - offsetof(type,member) );})
678 #define BUILD_BUG_ON_NOT_POWER_OF_2(n)
679 #define BUILD_BUG_ON_ZERO(e) (0)
680 #define BUILD_BUG_ON_NULL(e) ((void*)0)
681 #define BUILD_BUG_ON(condition)
682 #define BUILD_BUG() (0)
683 #else /* __CHECKER__ */
685 /* Force a compilation error if a constant expression is not a power of 2 */
686 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
687 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
689 /* Force a compilation error if condition is true, but also produce a
690 result (of value 0 and type size_t), so the expression can be used
691 e.g. in a structure initializer (or where-ever else comma expressions
692 aren't permitted). */
693 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
694 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
697 * BUILD_BUG_ON - break compile if a condition is true.
698 * @condition: the condition which the compiler should know is false.
700 * If you have some code which relies on certain constants being equal, or
701 * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
702 * detect if someone changes it.
704 * The implementation uses gcc's reluctance to create a negative array, but
705 * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
706 * to inline functions). So as a fallback we use the optimizer; if it can't
707 * prove the condition is false, it will cause a link error on the undefined
708 * "__build_bug_on_failed". This error message can be harder to track down
709 * though, hence the two different methods.
712 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
714 extern int __build_bug_on_failed;
715 #define BUILD_BUG_ON(condition) \
717 ((void)sizeof(char[1 - 2*!!(condition)])); \
718 if (condition) __build_bug_on_failed = 1; \
723 * BUILD_BUG - break compile if used.
725 * If you have some code that you expect the compiler to eliminate at
726 * build time, you should use BUILD_BUG to detect if it is
729 #define BUILD_BUG() \
731 extern void __build_bug_failed(void) \
732 __linktime_error("BUILD_BUG failed"); \
733 __build_bug_failed(); \
736 #endif /* __CHECKER__ */
738 /* Trap pasters of __FUNCTION__ at compile-time */
739 #define __FUNCTION__ (__func__)
741 /* This helps us to avoid #ifdef CONFIG_NUMA */
748 /* This helps us avoid #ifdef CONFIG_COMPACTION */
749 #ifdef CONFIG_COMPACTION
750 #define COMPACTION_BUILD 1
752 #define COMPACTION_BUILD 0
755 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
756 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
757 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
761 extern int do_sysinfo(struct sysinfo *info);
763 #endif /* __KERNEL__ */
765 #define SI_LOAD_SHIFT 16
767 long uptime; /* Seconds since boot */
768 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
769 unsigned long totalram; /* Total usable main memory size */
770 unsigned long freeram; /* Available memory size */
771 unsigned long sharedram; /* Amount of shared memory */
772 unsigned long bufferram; /* Memory used by buffers */
773 unsigned long totalswap; /* Total swap space size */
774 unsigned long freeswap; /* swap space still available */
775 unsigned short procs; /* Number of current processes */
776 unsigned short pad; /* explicit padding for m68k */
777 unsigned long totalhigh; /* Total high memory size */
778 unsigned long freehigh; /* Available high memory size */
779 unsigned int mem_unit; /* Memory unit size in bytes */
780 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */