Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_KERNEL_H
2#define _LINUX_KERNEL_H
3
4/*
5 * 'kernel.h' contains some often-used function prototypes etc
6 */
7
8#ifdef __KERNEL__
9
10#include <stdarg.h>
11#include <linux/linkage.h>
12#include <linux/stddef.h>
13#include <linux/types.h>
14#include <linux/compiler.h>
15#include <linux/bitops.h>
16#include <linux/log2.h>
17#include <linux/typecheck.h>
18#include <linux/ratelimit.h>
19#include <linux/dynamic_debug.h>
20#include <asm/byteorder.h>
21#include <asm/bug.h>
22
23extern const char linux_banner[];
24extern const char linux_proc_banner[];
25
26#define USHORT_MAX ((u16)(~0U))
27#define SHORT_MAX ((s16)(USHORT_MAX>>1))
28#define SHORT_MIN (-SHORT_MAX - 1)
29#define INT_MAX ((int)(~0U>>1))
30#define INT_MIN (-INT_MAX - 1)
31#define UINT_MAX (~0U)
32#define LONG_MAX ((long)(~0UL>>1))
33#define LONG_MIN (-LONG_MAX - 1)
34#define ULONG_MAX (~0UL)
35#define LLONG_MAX ((long long)(~0ULL>>1))
36#define LLONG_MIN (-LLONG_MAX - 1)
37#define ULLONG_MAX (~0ULL)
38
39#define STACK_MAGIC 0xdeadbeef
40
41#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
42#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(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)
45
46#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
47
48#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
49#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
50#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
51#define DIV_ROUND_CLOSEST(x, divisor)( \
52{ \
53 typeof(divisor) __divisor = divisor; \
54 (((x) + ((__divisor) / 2)) / (__divisor)); \
55} \
56)
57
58#define _RET_IP_ (unsigned long)__builtin_return_address(0)
59#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
60
61#ifdef CONFIG_LBDAF
62# include <asm/div64.h>
63# define sector_div(a, b) do_div(a, b)
64#else
65# define sector_div(n, b)( \
66{ \
67 int _res; \
68 _res = (n) % (b); \
69 (n) /= (b); \
70 _res; \
71} \
72)
73#endif
74
75/**
76 * upper_32_bits - return bits 32-63 of a number
77 * @n: the number we're accessing
78 *
79 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
80 * the "right shift count >= width of type" warning when that quantity is
81 * 32-bits.
82 */
83#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
84
85/**
86 * lower_32_bits - return bits 0-31 of a number
87 * @n: the number we're accessing
88 */
89#define lower_32_bits(n) ((u32)(n))
90
91#define KERN_EMERG "<0>" /* system is unusable */
92#define KERN_ALERT "<1>" /* action must be taken immediately */
93#define KERN_CRIT "<2>" /* critical conditions */
94#define KERN_ERR "<3>" /* error conditions */
95#define KERN_WARNING "<4>" /* warning conditions */
96#define KERN_NOTICE "<5>" /* normal but significant condition */
97#define KERN_INFO "<6>" /* informational */
98#define KERN_DEBUG "<7>" /* debug-level messages */
99
100/* Use the default kernel loglevel */
101#define KERN_DEFAULT "<d>"
102/*
103 * Annotation for a "continued" line of log printout (only done after a
104 * line that had no enclosing \n). Only to be used by core/arch code
105 * during early bootup (a continued line is not SMP-safe otherwise).
106 */
107#define KERN_CONT "<c>"
108
109extern int console_printk[];
110
111#define console_loglevel (console_printk[0])
112#define default_message_loglevel (console_printk[1])
113#define minimum_console_loglevel (console_printk[2])
114#define default_console_loglevel (console_printk[3])
115
116struct completion;
117struct pt_regs;
118struct user;
119
120#ifdef CONFIG_PREEMPT_VOLUNTARY
121extern int _cond_resched(void);
122# define might_resched() _cond_resched()
123#else
124# define might_resched() do { } while (0)
125#endif
126
127#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
128 void __might_sleep(char *file, int line, int preempt_offset);
129/**
130 * might_sleep - annotation for functions that can sleep
131 *
132 * this macro will print a stack trace if it is executed in an atomic
133 * context (spinlock, irq-handler, ...).
134 *
135 * This is a useful debugging help to be able to catch problems early and not
136 * be bitten later when the calling function happens to sleep when it is not
137 * supposed to.
138 */
139# define might_sleep() \
140 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
141#else
142 static inline void __might_sleep(char *file, int line, int preempt_offset) { }
143# define might_sleep() do { might_resched(); } while (0)
144#endif
145
146#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
147
148#define abs(x) ({ \
149 long __x = (x); \
150 (__x < 0) ? -__x : __x; \
151 })
152
153#ifdef CONFIG_PROVE_LOCKING
154void might_fault(void);
155#else
156static inline void might_fault(void)
157{
158 might_sleep();
159}
160#endif
161
162extern struct atomic_notifier_head panic_notifier_list;
163extern long (*panic_blink)(long time);
164NORET_TYPE void panic(const char * fmt, ...)
165 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
166extern void oops_enter(void);
167extern void oops_exit(void);
168extern int oops_may_print(void);
169NORET_TYPE void do_exit(long error_code)
170 ATTRIB_NORET;
171NORET_TYPE void complete_and_exit(struct completion *, long)
172 ATTRIB_NORET;
173extern unsigned long simple_strtoul(const char *,char **,unsigned int);
174extern long simple_strtol(const char *,char **,unsigned int);
175extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
176extern long long simple_strtoll(const char *,char **,unsigned int);
177extern int strict_strtoul(const char *, unsigned int, unsigned long *);
178extern int strict_strtol(const char *, unsigned int, long *);
179extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
180extern int strict_strtoll(const char *, unsigned int, long long *);
181extern int sprintf(char * buf, const char * fmt, ...)
182 __attribute__ ((format (printf, 2, 3)));
183extern int vsprintf(char *buf, const char *, va_list)
184 __attribute__ ((format (printf, 2, 0)));
185extern int snprintf(char * buf, size_t size, const char * fmt, ...)
186 __attribute__ ((format (printf, 3, 4)));
187extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
188 __attribute__ ((format (printf, 3, 0)));
189extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
190 __attribute__ ((format (printf, 3, 4)));
191extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
192 __attribute__ ((format (printf, 3, 0)));
193extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
194 __attribute__ ((format (printf, 2, 3)));
195extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
196
197extern int sscanf(const char *, const char *, ...)
198 __attribute__ ((format (scanf, 2, 3)));
199extern int vsscanf(const char *, const char *, va_list)
200 __attribute__ ((format (scanf, 2, 0)));
201
202extern int get_option(char **str, int *pint);
203extern char *get_options(const char *str, int nints, int *ints);
204extern unsigned long long memparse(const char *ptr, char **retptr);
205
206extern int core_kernel_text(unsigned long addr);
207extern int __kernel_text_address(unsigned long addr);
208extern int kernel_text_address(unsigned long addr);
209extern int func_ptr_is_kernel_text(void *ptr);
210
211struct pid;
212extern struct pid *session_of_pgrp(struct pid *pgrp);
213
214/*
215 * FW_BUG
216 * Add this to a message where you are sure the firmware is buggy or behaves
217 * really stupid or out of spec. Be aware that the responsible BIOS developer
218 * should be able to fix this issue or at least get a concrete idea of the
219 * problem by reading your message without the need of looking at the kernel
220 * code.
221 *
222 * Use it for definite and high priority BIOS bugs.
223 *
224 * FW_WARN
225 * Use it for not that clear (e.g. could the kernel messed up things already?)
226 * and medium priority BIOS bugs.
227 *
228 * FW_INFO
229 * Use this one if you want to tell the user or vendor about something
230 * suspicious, but generally harmless related to the firmware.
231 *
232 * Use it for information or very low priority BIOS bugs.
233 */
234#define FW_BUG "[Firmware Bug]: "
235#define FW_WARN "[Firmware Warn]: "
236#define FW_INFO "[Firmware Info]: "
237
238#ifdef CONFIG_PRINTK
239asmlinkage int vprintk(const char *fmt, va_list args)
240 __attribute__ ((format (printf, 1, 0)));
241asmlinkage int printk(const char * fmt, ...)
242 __attribute__ ((format (printf, 1, 2))) __cold;
243
244extern struct ratelimit_state printk_ratelimit_state;
245extern int printk_ratelimit(void);
246extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
247 unsigned int interval_msec);
248
249extern int printk_delay_msec;
250
251/*
252 * Print a one-time message (analogous to WARN_ONCE() et al):
253 */
254#define printk_once(x...) ({ \
255 static bool __print_once = true; \
256 \
257 if (__print_once) { \
258 __print_once = false; \
259 printk(x); \
260 } \
261})
262
263void log_buf_kexec_setup(void);
264#else
265static inline int vprintk(const char *s, va_list args)
266 __attribute__ ((format (printf, 1, 0)));
267static inline int vprintk(const char *s, va_list args) { return 0; }
268static inline int printk(const char *s, ...)
269 __attribute__ ((format (printf, 1, 2)));
270static inline int __cold printk(const char *s, ...) { return 0; }
271static inline int printk_ratelimit(void) { return 0; }
272static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
273 unsigned int interval_msec) \
274 { return false; }
275
276/* No effect, but we still get type checking even in the !PRINTK case: */
277#define printk_once(x...) printk(x)
278
279static inline void log_buf_kexec_setup(void)
280{
281}
282#endif
283
284extern int printk_needs_cpu(int cpu);
285extern void printk_tick(void);
286
287extern void asmlinkage __attribute__((format(printf, 1, 2)))
288 early_printk(const char *fmt, ...);
289
290unsigned long int_sqrt(unsigned long);
291
292static inline void console_silent(void)
293{
294 console_loglevel = 0;
295}
296
297static inline void console_verbose(void)
298{
299 if (console_loglevel)
300 console_loglevel = 15;
301}
302
303extern void bust_spinlocks(int yes);
304extern void wake_up_klogd(void);
305extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
306extern int panic_timeout;
307extern int panic_on_oops;
308extern int panic_on_unrecovered_nmi;
309extern int panic_on_io_nmi;
310extern const char *print_tainted(void);
311extern void add_taint(unsigned flag);
312extern int test_taint(unsigned flag);
313extern unsigned long get_taint(void);
314extern int root_mountflags;
315
316/* Values used for system_state */
317extern enum system_states {
318 SYSTEM_BOOTING,
319 SYSTEM_RUNNING,
320 SYSTEM_HALT,
321 SYSTEM_POWER_OFF,
322 SYSTEM_RESTART,
323 SYSTEM_SUSPEND_DISK,
324} system_state;
325
326#define TAINT_PROPRIETARY_MODULE 0
327#define TAINT_FORCED_MODULE 1
328#define TAINT_UNSAFE_SMP 2
329#define TAINT_FORCED_RMMOD 3
330#define TAINT_MACHINE_CHECK 4
331#define TAINT_BAD_PAGE 5
332#define TAINT_USER 6
333#define TAINT_DIE 7
334#define TAINT_OVERRIDDEN_ACPI_TABLE 8
335#define TAINT_WARN 9
336#define TAINT_CRAP 10
337
338extern void dump_stack(void) __cold;
339
340enum {
341 DUMP_PREFIX_NONE,
342 DUMP_PREFIX_ADDRESS,
343 DUMP_PREFIX_OFFSET
344};
345extern void hex_dump_to_buffer(const void *buf, size_t len,
346 int rowsize, int groupsize,
347 char *linebuf, size_t linebuflen, bool ascii);
348extern void print_hex_dump(const char *level, const char *prefix_str,
349 int prefix_type, int rowsize, int groupsize,
350 const void *buf, size_t len, bool ascii);
351extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
352 const void *buf, size_t len);
353
354extern const char hex_asc[];
355#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
356#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
357
358static inline char *pack_hex_byte(char *buf, u8 byte)
359{
360 *buf++ = hex_asc_hi(byte);
361 *buf++ = hex_asc_lo(byte);
362 return buf;
363}
364
365#ifndef pr_fmt
366#define pr_fmt(fmt) fmt
367#endif
368
369#define pr_emerg(fmt, ...) \
370 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
371#define pr_alert(fmt, ...) \
372 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
373#define pr_crit(fmt, ...) \
374 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
375#define pr_err(fmt, ...) \
376 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
377#define pr_warning(fmt, ...) \
378 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
379#define pr_notice(fmt, ...) \
380 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
381#define pr_info(fmt, ...) \
382 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
383#define pr_cont(fmt, ...) \
384 printk(KERN_CONT fmt, ##__VA_ARGS__)
385
386/* pr_devel() should produce zero code unless DEBUG is defined */
387#ifdef DEBUG
388#define pr_devel(fmt, ...) \
389 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
390#else
391#define pr_devel(fmt, ...) \
392 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
393#endif
394
395/* If you are writing a driver, please use dev_dbg instead */
396#if defined(DEBUG)
397#define pr_debug(fmt, ...) \
398 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
399#elif defined(CONFIG_DYNAMIC_DEBUG)
400/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
401#define pr_debug(fmt, ...) do { \
402 dynamic_pr_debug(fmt, ##__VA_ARGS__); \
403 } while (0)
404#else
405#define pr_debug(fmt, ...) \
406 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
407#endif
408
409/*
410 * General tracing related utility functions - trace_printk(),
411 * tracing_on/tracing_off and tracing_start()/tracing_stop
412 *
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.
420 *
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.
425 *
426 * Most likely, you want to use tracing_on/tracing_off.
427 */
428#ifdef CONFIG_RING_BUFFER
429void tracing_on(void);
430void tracing_off(void);
431/* trace_off_permanent stops recording with no way to bring it back */
432void tracing_off_permanent(void);
433int tracing_is_on(void);
434#else
435static inline void tracing_on(void) { }
436static inline void tracing_off(void) { }
437static inline void tracing_off_permanent(void) { }
438static inline int tracing_is_on(void) { return 0; }
439#endif
440#ifdef CONFIG_TRACING
441extern void tracing_start(void);
442extern void tracing_stop(void);
443extern void ftrace_off_permanent(void);
444
445extern void
446ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
447
448static inline void __attribute__ ((format (printf, 1, 2)))
449____trace_printk_check_format(const char *fmt, ...)
450{
451}
452#define __trace_printk_check_format(fmt, args...) \
453do { \
454 if (0) \
455 ____trace_printk_check_format(fmt, ##args); \
456} while (0)
457
458/**
459 * trace_printk - printf formatting in the ftrace buffer
460 * @fmt: the printf format for printing
461 *
462 * Note: __trace_printk is an internal function for trace_printk and
463 * the @ip is passed in via the trace_printk macro.
464 *
465 * This function allows a kernel developer to debug fast path sections
466 * that printk is not appropriate for. By scattering in various
467 * printk like tracing in the code, a developer can quickly see
468 * where problems are occurring.
469 *
470 * This is intended as a debugging tool for the developer only.
471 * Please refrain from leaving trace_printks scattered around in
472 * your code.
473 */
474
475#define trace_printk(fmt, args...) \
476do { \
477 __trace_printk_check_format(fmt, ##args); \
478 if (__builtin_constant_p(fmt)) { \
479 static const char *trace_printk_fmt \
480 __attribute__((section("__trace_printk_fmt"))) = \
481 __builtin_constant_p(fmt) ? fmt : NULL; \
482 \
483 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
484 } else \
485 __trace_printk(_THIS_IP_, fmt, ##args); \
486} while (0)
487
488extern int
489__trace_bprintk(unsigned long ip, const char *fmt, ...)
490 __attribute__ ((format (printf, 2, 3)));
491
492extern int
493__trace_printk(unsigned long ip, const char *fmt, ...)
494 __attribute__ ((format (printf, 2, 3)));
495
496/*
497 * The double __builtin_constant_p is because gcc will give us an error
498 * if we try to allocate the static variable to fmt if it is not a
499 * constant. Even with the outer if statement.
500 */
501#define ftrace_vprintk(fmt, vargs) \
502do { \
503 if (__builtin_constant_p(fmt)) { \
504 static const char *trace_printk_fmt \
505 __attribute__((section("__trace_printk_fmt"))) = \
506 __builtin_constant_p(fmt) ? fmt : NULL; \
507 \
508 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
509 } else \
510 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
511} while (0)
512
513extern int
514__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
515
516extern int
517__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
518
519extern void ftrace_dump(void);
520#else
521static inline void
522ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
523static inline int
524trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
525
526static inline void tracing_start(void) { }
527static inline void tracing_stop(void) { }
528static inline void ftrace_off_permanent(void) { }
529static inline int
530trace_printk(const char *fmt, ...)
531{
532 return 0;
533}
534static inline int
535ftrace_vprintk(const char *fmt, va_list ap)
536{
537 return 0;
538}
539static inline void ftrace_dump(void) { }
540#endif /* CONFIG_TRACING */
541
542/*
543 * Display an IP address in readable format.
544 */
545
546#define NIPQUAD(addr) \
547 ((unsigned char *)&addr)[0], \
548 ((unsigned char *)&addr)[1], \
549 ((unsigned char *)&addr)[2], \
550 ((unsigned char *)&addr)[3]
551#define NIPQUAD_FMT "%u.%u.%u.%u"
552
553/*
554 * min()/max()/clamp() macros that also do
555 * strict type-checking.. See the
556 * "unnecessary" pointer comparison.
557 */
558#define min(x, y) ({ \
559 typeof(x) _min1 = (x); \
560 typeof(y) _min2 = (y); \
561 (void) (&_min1 == &_min2); \
562 _min1 < _min2 ? _min1 : _min2; })
563
564#define max(x, y) ({ \
565 typeof(x) _max1 = (x); \
566 typeof(y) _max2 = (y); \
567 (void) (&_max1 == &_max2); \
568 _max1 > _max2 ? _max1 : _max2; })
569
570/**
571 * clamp - return a value clamped to a given range with strict typechecking
572 * @val: current value
573 * @min: minimum allowable value
574 * @max: maximum allowable value
575 *
576 * This macro does strict typechecking of min/max to make sure they are of the
577 * same type as val. See the unnecessary pointer comparisons.
578 */
579#define clamp(val, min, max) ({ \
580 typeof(val) __val = (val); \
581 typeof(min) __min = (min); \
582 typeof(max) __max = (max); \
583 (void) (&__val == &__min); \
584 (void) (&__val == &__max); \
585 __val = __val < __min ? __min: __val; \
586 __val > __max ? __max: __val; })
587
588/*
589 * ..and if you can't take the strict
590 * types, you can specify one yourself.
591 *
592 * Or not use min/max/clamp at all, of course.
593 */
594#define min_t(type, x, y) ({ \
595 type __min1 = (x); \
596 type __min2 = (y); \
597 __min1 < __min2 ? __min1: __min2; })
598
599#define max_t(type, x, y) ({ \
600 type __max1 = (x); \
601 type __max2 = (y); \
602 __max1 > __max2 ? __max1: __max2; })
603
604/**
605 * clamp_t - return a value clamped to a given range using a given type
606 * @type: the type of variable to use
607 * @val: current value
608 * @min: minimum allowable value
609 * @max: maximum allowable value
610 *
611 * This macro does no typechecking and uses temporary variables of type
612 * 'type' to make all the comparisons.
613 */
614#define clamp_t(type, val, min, max) ({ \
615 type __val = (val); \
616 type __min = (min); \
617 type __max = (max); \
618 __val = __val < __min ? __min: __val; \
619 __val > __max ? __max: __val; })
620
621/**
622 * clamp_val - return a value clamped to a given range using val's type
623 * @val: current value
624 * @min: minimum allowable value
625 * @max: maximum allowable value
626 *
627 * This macro does no typechecking and uses temporary variables of whatever
628 * type the input argument 'val' is. This is useful when val is an unsigned
629 * type and min and max are literals that will otherwise be assigned a signed
630 * integer type.
631 */
632#define clamp_val(val, min, max) ({ \
633 typeof(val) __val = (val); \
634 typeof(val) __min = (min); \
635 typeof(val) __max = (max); \
636 __val = __val < __min ? __min: __val; \
637 __val > __max ? __max: __val; })
638
639
640/*
641 * swap - swap value of @a and @b
642 */
643#define swap(a, b) \
644 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
645
646/**
647 * container_of - cast a member of a structure out to the containing structure
648 * @ptr: the pointer to the member.
649 * @type: the type of the container struct this is embedded in.
650 * @member: the name of the member within the struct.
651 *
652 */
653#define container_of(ptr, type, member) ({ \
654 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
655 (type *)( (char *)__mptr - offsetof(type,member) );})
656
657struct sysinfo;
658extern int do_sysinfo(struct sysinfo *info);
659
660#endif /* __KERNEL__ */
661
662#ifndef __EXPORTED_HEADERS__
663#ifndef __KERNEL__
664#warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders
665#endif /* __KERNEL__ */
666#endif /* __EXPORTED_HEADERS__ */
667
668#define SI_LOAD_SHIFT 16
669struct sysinfo {
670 long uptime; /* Seconds since boot */
671 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
672 unsigned long totalram; /* Total usable main memory size */
673 unsigned long freeram; /* Available memory size */
674 unsigned long sharedram; /* Amount of shared memory */
675 unsigned long bufferram; /* Memory used by buffers */
676 unsigned long totalswap; /* Total swap space size */
677 unsigned long freeswap; /* swap space still available */
678 unsigned short procs; /* Number of current processes */
679 unsigned short pad; /* explicit padding for m68k */
680 unsigned long totalhigh; /* Total high memory size */
681 unsigned long freehigh; /* Available high memory size */
682 unsigned int mem_unit; /* Memory unit size in bytes */
683 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
684};
685
686/* Force a compilation error if condition is true */
687#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
688
689/* Force a compilation error if condition is constant and true */
690#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
691
692/* Force a compilation error if condition is true, but also produce a
693 result (of value 0 and type size_t), so the expression can be used
694 e.g. in a structure initializer (or where-ever else comma expressions
695 aren't permitted). */
696#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
697#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
698
699/* Trap pasters of __FUNCTION__ at compile-time */
700#define __FUNCTION__ (__func__)
701
702/* This helps us to avoid #ifdef CONFIG_NUMA */
703#ifdef CONFIG_NUMA
704#define NUMA_BUILD 1
705#else
706#define NUMA_BUILD 0
707#endif
708
709/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
710#ifdef CONFIG_FTRACE_MCOUNT_RECORD
711# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
712#endif
713
714#endif