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);
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__); might_resched(); } while (0)
141#else
142# define might_sleep() do { might_resched(); } while (0)
143#endif
144
145#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
146
147#define abs(x) ({ \
148 int __x = (x); \
149 (__x < 0) ? -__x : __x; \
150 })
151
152#ifdef CONFIG_PROVE_LOCKING
153void might_fault(void);
154#else
155static inline void might_fault(void)
156{
157 might_sleep();
158}
159#endif
160
161extern struct atomic_notifier_head panic_notifier_list;
162extern long (*panic_blink)(long time);
163NORET_TYPE void panic(const char * fmt, ...)
164 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
165extern void oops_enter(void);
166extern void oops_exit(void);
167extern int oops_may_print(void);
168NORET_TYPE void do_exit(long error_code)
169 ATTRIB_NORET;
170NORET_TYPE void complete_and_exit(struct completion *, long)
171 ATTRIB_NORET;
172extern unsigned long simple_strtoul(const char *,char **,unsigned int);
173extern long simple_strtol(const char *,char **,unsigned int);
174extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
175extern long long simple_strtoll(const char *,char **,unsigned int);
176extern int strict_strtoul(const char *, unsigned int, unsigned long *);
177extern int strict_strtol(const char *, unsigned int, long *);
178extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
179extern int strict_strtoll(const char *, unsigned int, long long *);
180extern int sprintf(char * buf, const char * fmt, ...)
181 __attribute__ ((format (printf, 2, 3)));
182extern int vsprintf(char *buf, const char *, va_list)
183 __attribute__ ((format (printf, 2, 0)));
184extern int snprintf(char * buf, size_t size, const char * fmt, ...)
185 __attribute__ ((format (printf, 3, 4)));
186extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
187 __attribute__ ((format (printf, 3, 0)));
188extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
189 __attribute__ ((format (printf, 3, 4)));
190extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
191 __attribute__ ((format (printf, 3, 0)));
192extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
193 __attribute__ ((format (printf, 2, 3)));
194extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
195
196extern int sscanf(const char *, const char *, ...)
197 __attribute__ ((format (scanf, 2, 3)));
198extern int vsscanf(const char *, const char *, va_list)
199 __attribute__ ((format (scanf, 2, 0)));
200
201extern int get_option(char **str, int *pint);
202extern char *get_options(const char *str, int nints, int *ints);
203extern unsigned long long memparse(const char *ptr, char **retptr);
204
205extern int core_kernel_text(unsigned long addr);
206extern int __kernel_text_address(unsigned long addr);
207extern int kernel_text_address(unsigned long addr);
208extern int func_ptr_is_kernel_text(void *ptr);
209
210struct pid;
211extern struct pid *session_of_pgrp(struct pid *pgrp);
212
213/*
214 * FW_BUG
215 * Add this to a message where you are sure the firmware is buggy or behaves
216 * really stupid or out of spec. Be aware that the responsible BIOS developer
217 * should be able to fix this issue or at least get a concrete idea of the
218 * problem by reading your message without the need of looking at the kernel
219 * code.
220 *
221 * Use it for definite and high priority BIOS bugs.
222 *
223 * FW_WARN
224 * Use it for not that clear (e.g. could the kernel messed up things already?)
225 * and medium priority BIOS bugs.
226 *
227 * FW_INFO
228 * Use this one if you want to tell the user or vendor about something
229 * suspicious, but generally harmless related to the firmware.
230 *
231 * Use it for information or very low priority BIOS bugs.
232 */
233#define FW_BUG "[Firmware Bug]: "
234#define FW_WARN "[Firmware Warn]: "
235#define FW_INFO "[Firmware Info]: "
236
237#ifdef CONFIG_PRINTK
238asmlinkage int vprintk(const char *fmt, va_list args)
239 __attribute__ ((format (printf, 1, 0)));
240asmlinkage int printk(const char * fmt, ...)
241 __attribute__ ((format (printf, 1, 2))) __cold;
242
243extern struct ratelimit_state printk_ratelimit_state;
244extern int printk_ratelimit(void);
245extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
246 unsigned int interval_msec);
247
248/*
249 * Print a one-time message (analogous to WARN_ONCE() et al):
250 */
251#define printk_once(x...) ({ \
252 static int __print_once = 1; \
253 \
254 if (__print_once) { \
255 __print_once = 0; \
256 printk(x); \
257 } \
258})
259
260void log_buf_kexec_setup(void);
261#else
262static inline int vprintk(const char *s, va_list args)
263 __attribute__ ((format (printf, 1, 0)));
264static inline int vprintk(const char *s, va_list args) { return 0; }
265static inline int printk(const char *s, ...)
266 __attribute__ ((format (printf, 1, 2)));
267static inline int __cold printk(const char *s, ...) { return 0; }
268static inline int printk_ratelimit(void) { return 0; }
269static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
270 unsigned int interval_msec) \
271 { return false; }
272
273/* No effect, but we still get type checking even in the !PRINTK case: */
274#define printk_once(x...) printk(x)
275
276static inline void log_buf_kexec_setup(void)
277{
278}
279#endif
280
281extern int printk_needs_cpu(int cpu);
282extern void printk_tick(void);
283
284extern void asmlinkage __attribute__((format(printf, 1, 2)))
285 early_printk(const char *fmt, ...);
286
287unsigned long int_sqrt(unsigned long);
288
289static inline void console_silent(void)
290{
291 console_loglevel = 0;
292}
293
294static inline void console_verbose(void)
295{
296 if (console_loglevel)
297 console_loglevel = 15;
298}
299
300extern void bust_spinlocks(int yes);
301extern void wake_up_klogd(void);
302extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
303extern int panic_timeout;
304extern int panic_on_oops;
305extern int panic_on_unrecovered_nmi;
306extern int panic_on_io_nmi;
307extern const char *print_tainted(void);
308extern void add_taint(unsigned flag);
309extern int test_taint(unsigned flag);
310extern unsigned long get_taint(void);
311extern int root_mountflags;
312
313/* Values used for system_state */
314extern enum system_states {
315 SYSTEM_BOOTING,
316 SYSTEM_RUNNING,
317 SYSTEM_HALT,
318 SYSTEM_POWER_OFF,
319 SYSTEM_RESTART,
320 SYSTEM_SUSPEND_DISK,
321} system_state;
322
323#define TAINT_PROPRIETARY_MODULE 0
324#define TAINT_FORCED_MODULE 1
325#define TAINT_UNSAFE_SMP 2
326#define TAINT_FORCED_RMMOD 3
327#define TAINT_MACHINE_CHECK 4
328#define TAINT_BAD_PAGE 5
329#define TAINT_USER 6
330#define TAINT_DIE 7
331#define TAINT_OVERRIDDEN_ACPI_TABLE 8
332#define TAINT_WARN 9
333#define TAINT_CRAP 10
334
335extern void dump_stack(void) __cold;
336
337enum {
338 DUMP_PREFIX_NONE,
339 DUMP_PREFIX_ADDRESS,
340 DUMP_PREFIX_OFFSET
341};
342extern void hex_dump_to_buffer(const void *buf, size_t len,
343 int rowsize, int groupsize,
344 char *linebuf, size_t linebuflen, bool ascii);
345extern void print_hex_dump(const char *level, const char *prefix_str,
346 int prefix_type, int rowsize, int groupsize,
347 const void *buf, size_t len, bool ascii);
348extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
349 const void *buf, size_t len);
350
351extern const char hex_asc[];
352#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
353#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
354
355static inline char *pack_hex_byte(char *buf, u8 byte)
356{
357 *buf++ = hex_asc_hi(byte);
358 *buf++ = hex_asc_lo(byte);
359 return buf;
360}
361
362#ifndef pr_fmt
363#define pr_fmt(fmt) fmt
364#endif
365
366#define pr_emerg(fmt, ...) \
367 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
368#define pr_alert(fmt, ...) \
369 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
370#define pr_crit(fmt, ...) \
371 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
372#define pr_err(fmt, ...) \
373 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
374#define pr_warning(fmt, ...) \
375 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
376#define pr_notice(fmt, ...) \
377 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
378#define pr_info(fmt, ...) \
379 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
380#define pr_cont(fmt, ...) \
381 printk(KERN_CONT fmt, ##__VA_ARGS__)
382
383/* pr_devel() should produce zero code unless DEBUG is defined */
384#ifdef DEBUG
385#define pr_devel(fmt, ...) \
386 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
387#else
388#define pr_devel(fmt, ...) \
389 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
390#endif
391
392/* If you are writing a driver, please use dev_dbg instead */
393#if defined(DEBUG)
394#define pr_debug(fmt, ...) \
395 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
396#elif defined(CONFIG_DYNAMIC_DEBUG)
397/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
398#define pr_debug(fmt, ...) do { \
399 dynamic_pr_debug(fmt, ##__VA_ARGS__); \
400 } while (0)
401#else
402#define pr_debug(fmt, ...) \
403 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
404#endif
405
406/*
407 * General tracing related utility functions - trace_printk(),
408 * tracing_on/tracing_off and tracing_start()/tracing_stop
409 *
410 * Use tracing_on/tracing_off when you want to quickly turn on or off
411 * tracing. It simply enables or disables the recording of the trace events.
412 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
413 * file, which gives a means for the kernel and userspace to interact.
414 * Place a tracing_off() in the kernel where you want tracing to end.
415 * From user space, examine the trace, and then echo 1 > tracing_on
416 * to continue tracing.
417 *
418 * tracing_stop/tracing_start has slightly more overhead. It is used
419 * by things like suspend to ram where disabling the recording of the
420 * trace is not enough, but tracing must actually stop because things
421 * like calling smp_processor_id() may crash the system.
422 *
423 * Most likely, you want to use tracing_on/tracing_off.
424 */
425#ifdef CONFIG_RING_BUFFER
426void tracing_on(void);
427void tracing_off(void);
428/* trace_off_permanent stops recording with no way to bring it back */
429void tracing_off_permanent(void);
430int tracing_is_on(void);
431#else
432static inline void tracing_on(void) { }
433static inline void tracing_off(void) { }
434static inline void tracing_off_permanent(void) { }
435static inline int tracing_is_on(void) { return 0; }
436#endif
437#ifdef CONFIG_TRACING
438extern void tracing_start(void);
439extern void tracing_stop(void);
440extern void ftrace_off_permanent(void);
441
442extern void
443ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
444
445static inline void __attribute__ ((format (printf, 1, 2)))
446____trace_printk_check_format(const char *fmt, ...)
447{
448}
449#define __trace_printk_check_format(fmt, args...) \
450do { \
451 if (0) \
452 ____trace_printk_check_format(fmt, ##args); \
453} while (0)
454
455/**
456 * trace_printk - printf formatting in the ftrace buffer
457 * @fmt: the printf format for printing
458 *
459 * Note: __trace_printk is an internal function for trace_printk and
460 * the @ip is passed in via the trace_printk macro.
461 *
462 * This function allows a kernel developer to debug fast path sections
463 * that printk is not appropriate for. By scattering in various
464 * printk like tracing in the code, a developer can quickly see
465 * where problems are occurring.
466 *
467 * This is intended as a debugging tool for the developer only.
468 * Please refrain from leaving trace_printks scattered around in
469 * your code.
470 */
471
472#define trace_printk(fmt, args...) \
473do { \
474 __trace_printk_check_format(fmt, ##args); \
475 if (__builtin_constant_p(fmt)) { \
476 static const char *trace_printk_fmt \
477 __attribute__((section("__trace_printk_fmt"))) = \
478 __builtin_constant_p(fmt) ? fmt : NULL; \
479 \
480 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
481 } else \
482 __trace_printk(_THIS_IP_, fmt, ##args); \
483} while (0)
484
485extern int
486__trace_bprintk(unsigned long ip, const char *fmt, ...)
487 __attribute__ ((format (printf, 2, 3)));
488
489extern int
490__trace_printk(unsigned long ip, const char *fmt, ...)
491 __attribute__ ((format (printf, 2, 3)));
492
493/*
494 * The double __builtin_constant_p is because gcc will give us an error
495 * if we try to allocate the static variable to fmt if it is not a
496 * constant. Even with the outer if statement.
497 */
498#define ftrace_vprintk(fmt, vargs) \
499do { \
500 if (__builtin_constant_p(fmt)) { \
501 static const char *trace_printk_fmt \
502 __attribute__((section("__trace_printk_fmt"))) = \
503 __builtin_constant_p(fmt) ? fmt : NULL; \
504 \
505 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
506 } else \
507 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
508} while (0)
509
510extern int
511__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
512
513extern int
514__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
515
516extern void ftrace_dump(void);
517#else
518static inline void
519ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
520static inline int
521trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
522
523static inline void tracing_start(void) { }
524static inline void tracing_stop(void) { }
525static inline void ftrace_off_permanent(void) { }
526static inline int
527trace_printk(const char *fmt, ...)
528{
529 return 0;
530}
531static inline int
532ftrace_vprintk(const char *fmt, va_list ap)
533{
534 return 0;
535}
536static inline void ftrace_dump(void) { }
537#endif /* CONFIG_TRACING */
538
539/*
540 * Display an IP address in readable format.
541 */
542
543#define NIPQUAD(addr) \
544 ((unsigned char *)&addr)[0], \
545 ((unsigned char *)&addr)[1], \
546 ((unsigned char *)&addr)[2], \
547 ((unsigned char *)&addr)[3]
548#define NIPQUAD_FMT "%u.%u.%u.%u"
549
550/*
551 * min()/max()/clamp() macros that also do
552 * strict type-checking.. See the
553 * "unnecessary" pointer comparison.
554 */
555#define min(x, y) ({ \
556 typeof(x) _min1 = (x); \
557 typeof(y) _min2 = (y); \
558 (void) (&_min1 == &_min2); \
559 _min1 < _min2 ? _min1 : _min2; })
560
561#define max(x, y) ({ \
562 typeof(x) _max1 = (x); \
563 typeof(y) _max2 = (y); \
564 (void) (&_max1 == &_max2); \
565 _max1 > _max2 ? _max1 : _max2; })
566
567/**
568 * clamp - return a value clamped to a given range with strict typechecking
569 * @val: current value
570 * @min: minimum allowable value
571 * @max: maximum allowable value
572 *
573 * This macro does strict typechecking of min/max to make sure they are of the
574 * same type as val. See the unnecessary pointer comparisons.
575 */
576#define clamp(val, min, max) ({ \
577 typeof(val) __val = (val); \
578 typeof(min) __min = (min); \
579 typeof(max) __max = (max); \
580 (void) (&__val == &__min); \
581 (void) (&__val == &__max); \
582 __val = __val < __min ? __min: __val; \
583 __val > __max ? __max: __val; })
584
585/*
586 * ..and if you can't take the strict
587 * types, you can specify one yourself.
588 *
589 * Or not use min/max/clamp at all, of course.
590 */
591#define min_t(type, x, y) ({ \
592 type __min1 = (x); \
593 type __min2 = (y); \
594 __min1 < __min2 ? __min1: __min2; })
595
596#define max_t(type, x, y) ({ \
597 type __max1 = (x); \
598 type __max2 = (y); \
599 __max1 > __max2 ? __max1: __max2; })
600
601/**
602 * clamp_t - return a value clamped to a given range using a given type
603 * @type: the type of variable to use
604 * @val: current value
605 * @min: minimum allowable value
606 * @max: maximum allowable value
607 *
608 * This macro does no typechecking and uses temporary variables of type
609 * 'type' to make all the comparisons.
610 */
611#define clamp_t(type, val, min, max) ({ \
612 type __val = (val); \
613 type __min = (min); \
614 type __max = (max); \
615 __val = __val < __min ? __min: __val; \
616 __val > __max ? __max: __val; })
617
618/**
619 * clamp_val - return a value clamped to a given range using val's type
620 * @val: current value
621 * @min: minimum allowable value
622 * @max: maximum allowable value
623 *
624 * This macro does no typechecking and uses temporary variables of whatever
625 * type the input argument 'val' is. This is useful when val is an unsigned
626 * type and min and max are literals that will otherwise be assigned a signed
627 * integer type.
628 */
629#define clamp_val(val, min, max) ({ \
630 typeof(val) __val = (val); \
631 typeof(val) __min = (min); \
632 typeof(val) __max = (max); \
633 __val = __val < __min ? __min: __val; \
634 __val > __max ? __max: __val; })
635
636
637/*
638 * swap - swap value of @a and @b
639 */
640#define swap(a, b) \
641 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
642
643/**
644 * container_of - cast a member of a structure out to the containing structure
645 * @ptr: the pointer to the member.
646 * @type: the type of the container struct this is embedded in.
647 * @member: the name of the member within the struct.
648 *
649 */
650#define container_of(ptr, type, member) ({ \
651 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
652 (type *)( (char *)__mptr - offsetof(type,member) );})
653
654struct sysinfo;
655extern int do_sysinfo(struct sysinfo *info);
656
657#endif /* __KERNEL__ */
658
659#define SI_LOAD_SHIFT 16
660struct sysinfo {
661 long uptime; /* Seconds since boot */
662 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
663 unsigned long totalram; /* Total usable main memory size */
664 unsigned long freeram; /* Available memory size */
665 unsigned long sharedram; /* Amount of shared memory */
666 unsigned long bufferram; /* Memory used by buffers */
667 unsigned long totalswap; /* Total swap space size */
668 unsigned long freeswap; /* swap space still available */
669 unsigned short procs; /* Number of current processes */
670 unsigned short pad; /* explicit padding for m68k */
671 unsigned long totalhigh; /* Total high memory size */
672 unsigned long freehigh; /* Available high memory size */
673 unsigned int mem_unit; /* Memory unit size in bytes */
674 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
675};
676
677/* Force a compilation error if condition is true */
678#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
679
680/* Force a compilation error if condition is true, but also produce a
681 result (of value 0 and type size_t), so the expression can be used
682 e.g. in a structure initializer (or where-ever else comma expressions
683 aren't permitted). */
684#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
685
686/* Trap pasters of __FUNCTION__ at compile-time */
687#define __FUNCTION__ (__func__)
688
689/* This helps us to avoid #ifdef CONFIG_NUMA */
690#ifdef CONFIG_NUMA
691#define NUMA_BUILD 1
692#else
693#define NUMA_BUILD 0
694#endif
695
696/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
697#ifdef CONFIG_FTRACE_MCOUNT_RECORD
698# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
699#endif
700
701#endif