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/dynamic_debug.h>
21 #include <asm/byteorder.h>
24 extern const char linux_banner[];
25 extern const char linux_proc_banner[];
27 #define USHRT_MAX ((u16)(~0U))
28 #define SHRT_MAX ((s16)(USHRT_MAX>>1))
29 #define SHRT_MIN ((s16)(-SHRT_MAX - 1))
30 #define INT_MAX ((int)(~0U>>1))
31 #define INT_MIN (-INT_MAX - 1)
32 #define UINT_MAX (~0U)
33 #define LONG_MAX ((long)(~0UL>>1))
34 #define LONG_MIN (-LONG_MAX - 1)
35 #define ULONG_MAX (~0UL)
36 #define LLONG_MAX ((long long)(~0ULL>>1))
37 #define LLONG_MIN (-LLONG_MAX - 1)
38 #define ULLONG_MAX (~0ULL)
40 #define STACK_MAGIC 0xdeadbeef
42 #define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
43 #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask))
44 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
45 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
47 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
50 * This looks more complex than it should be. But we need to
51 * get the type for the ~ right in round_down (it needs to be
52 * as wide as the result!), and we want to evaluate the macro
53 * arguments just once each.
55 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
56 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
57 #define round_down(x, y) ((x) & ~__round_mask(x, y))
59 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
60 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
61 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
62 #define rounddown(x, y) ( \
64 typeof(x) __x = (x); \
68 #define DIV_ROUND_CLOSEST(x, divisor)( \
70 typeof(divisor) __divisor = divisor; \
71 (((x) + ((__divisor) / 2)) / (__divisor)); \
75 #define _RET_IP_ (unsigned long)__builtin_return_address(0)
76 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
79 # include <asm/div64.h>
80 # define sector_div(a, b) do_div(a, b)
82 # define sector_div(n, b)( \
93 * upper_32_bits - return bits 32-63 of a number
94 * @n: the number we're accessing
96 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
97 * the "right shift count >= width of type" warning when that quantity is
100 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
103 * lower_32_bits - return bits 0-31 of a number
104 * @n: the number we're accessing
106 #define lower_32_bits(n) ((u32)(n))
108 #define KERN_EMERG "<0>" /* system is unusable */
109 #define KERN_ALERT "<1>" /* action must be taken immediately */
110 #define KERN_CRIT "<2>" /* critical conditions */
111 #define KERN_ERR "<3>" /* error conditions */
112 #define KERN_WARNING "<4>" /* warning conditions */
113 #define KERN_NOTICE "<5>" /* normal but significant condition */
114 #define KERN_INFO "<6>" /* informational */
115 #define KERN_DEBUG "<7>" /* debug-level messages */
117 /* Use the default kernel loglevel */
118 #define KERN_DEFAULT "<d>"
120 * Annotation for a "continued" line of log printout (only done after a
121 * line that had no enclosing \n). Only to be used by core/arch code
122 * during early bootup (a continued line is not SMP-safe otherwise).
124 #define KERN_CONT "<c>"
126 extern int console_printk[];
128 #define console_loglevel (console_printk[0])
129 #define default_message_loglevel (console_printk[1])
130 #define minimum_console_loglevel (console_printk[2])
131 #define default_console_loglevel (console_printk[3])
137 #ifdef CONFIG_PREEMPT_VOLUNTARY
138 extern int _cond_resched(void);
139 # define might_resched() _cond_resched()
141 # define might_resched() do { } while (0)
144 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
145 void __might_sleep(const char *file, int line, int preempt_offset);
147 * might_sleep - annotation for functions that can sleep
149 * this macro will print a stack trace if it is executed in an atomic
150 * context (spinlock, irq-handler, ...).
152 * This is a useful debugging help to be able to catch problems early and not
153 * be bitten later when the calling function happens to sleep when it is not
156 # define might_sleep() \
157 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
159 static inline void __might_sleep(const char *file, int line,
160 int preempt_offset) { }
161 # define might_sleep() do { might_resched(); } while (0)
164 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
168 (__x < 0) ? -__x : __x; \
171 #ifdef CONFIG_PROVE_LOCKING
172 void might_fault(void);
174 static inline void might_fault(void)
185 extern struct atomic_notifier_head panic_notifier_list;
186 extern long (*panic_blink)(int state);
187 NORET_TYPE void panic(const char * fmt, ...)
188 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
189 extern void oops_enter(void);
190 extern void oops_exit(void);
191 void print_oops_end_marker(void);
192 extern int oops_may_print(void);
193 NORET_TYPE void do_exit(long error_code)
195 NORET_TYPE void complete_and_exit(struct completion *, long)
197 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
198 extern long simple_strtol(const char *,char **,unsigned int);
199 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
200 extern long long simple_strtoll(const char *,char **,unsigned int);
201 extern int strict_strtoul(const char *, unsigned int, unsigned long *);
202 extern int strict_strtol(const char *, unsigned int, long *);
203 extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
204 extern int strict_strtoll(const char *, unsigned int, long long *);
205 extern int sprintf(char * buf, const char * fmt, ...)
206 __attribute__ ((format (printf, 2, 3)));
207 extern int vsprintf(char *buf, const char *, va_list)
208 __attribute__ ((format (printf, 2, 0)));
209 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
210 __attribute__ ((format (printf, 3, 4)));
211 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
212 __attribute__ ((format (printf, 3, 0)));
213 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
214 __attribute__ ((format (printf, 3, 4)));
215 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
216 __attribute__ ((format (printf, 3, 0)));
217 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
218 __attribute__ ((format (printf, 2, 3)));
219 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
221 extern int sscanf(const char *, const char *, ...)
222 __attribute__ ((format (scanf, 2, 3)));
223 extern int vsscanf(const char *, const char *, va_list)
224 __attribute__ ((format (scanf, 2, 0)));
226 extern int get_option(char **str, int *pint);
227 extern char *get_options(const char *str, int nints, int *ints);
228 extern unsigned long long memparse(const char *ptr, char **retptr);
230 extern int core_kernel_text(unsigned long addr);
231 extern int __kernel_text_address(unsigned long addr);
232 extern int kernel_text_address(unsigned long addr);
233 extern int func_ptr_is_kernel_text(void *ptr);
236 extern struct pid *session_of_pgrp(struct pid *pgrp);
240 * Add this to a message where you are sure the firmware is buggy or behaves
241 * really stupid or out of spec. Be aware that the responsible BIOS developer
242 * should be able to fix this issue or at least get a concrete idea of the
243 * problem by reading your message without the need of looking at the kernel
246 * Use it for definite and high priority BIOS bugs.
249 * Use it for not that clear (e.g. could the kernel messed up things already?)
250 * and medium priority BIOS bugs.
253 * Use this one if you want to tell the user or vendor about something
254 * suspicious, but generally harmless related to the firmware.
256 * Use it for information or very low priority BIOS bugs.
258 #define FW_BUG "[Firmware Bug]: "
259 #define FW_WARN "[Firmware Warn]: "
260 #define FW_INFO "[Firmware Info]: "
264 * Add this to a message for hardware errors, so that user can report
265 * it to hardware vendor instead of LKML or software vendor.
267 #define HW_ERR "[Hardware Error]: "
270 asmlinkage int vprintk(const char *fmt, va_list args)
271 __attribute__ ((format (printf, 1, 0)));
272 asmlinkage int printk(const char * fmt, ...)
273 __attribute__ ((format (printf, 1, 2))) __cold;
275 extern int __printk_ratelimit(const char *func);
276 #define printk_ratelimit() __printk_ratelimit(__func__)
277 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
278 unsigned int interval_msec);
280 extern int printk_delay_msec;
283 * Print a one-time message (analogous to WARN_ONCE() et al):
285 #define printk_once(x...) ({ \
286 static bool __print_once; \
288 if (!__print_once) { \
289 __print_once = true; \
294 void log_buf_kexec_setup(void);
296 static inline int vprintk(const char *s, va_list args)
297 __attribute__ ((format (printf, 1, 0)));
298 static inline int vprintk(const char *s, va_list args) { return 0; }
299 static inline int printk(const char *s, ...)
300 __attribute__ ((format (printf, 1, 2)));
301 static inline int __cold printk(const char *s, ...) { return 0; }
302 static inline int printk_ratelimit(void) { return 0; }
303 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
304 unsigned int interval_msec) \
307 /* No effect, but we still get type checking even in the !PRINTK case: */
308 #define printk_once(x...) printk(x)
310 static inline void log_buf_kexec_setup(void)
316 * Dummy printk for disabled debugging statements to use whilst maintaining
317 * gcc's format and side-effect checking.
319 static inline __attribute__ ((format (printf, 1, 2)))
320 int no_printk(const char *s, ...) { return 0; }
322 extern int printk_needs_cpu(int cpu);
323 extern void printk_tick(void);
325 extern void asmlinkage __attribute__((format(printf, 1, 2)))
326 early_printk(const char *fmt, ...);
328 unsigned long int_sqrt(unsigned long);
330 static inline void console_silent(void)
332 console_loglevel = 0;
335 static inline void console_verbose(void)
337 if (console_loglevel)
338 console_loglevel = 15;
341 extern void bust_spinlocks(int yes);
342 extern void wake_up_klogd(void);
343 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
344 extern int panic_timeout;
345 extern int panic_on_oops;
346 extern int panic_on_unrecovered_nmi;
347 extern int panic_on_io_nmi;
348 extern const char *print_tainted(void);
349 extern void add_taint(unsigned flag);
350 extern int test_taint(unsigned flag);
351 extern unsigned long get_taint(void);
352 extern int root_mountflags;
354 /* Values used for system_state */
355 extern enum system_states {
364 #define TAINT_PROPRIETARY_MODULE 0
365 #define TAINT_FORCED_MODULE 1
366 #define TAINT_UNSAFE_SMP 2
367 #define TAINT_FORCED_RMMOD 3
368 #define TAINT_MACHINE_CHECK 4
369 #define TAINT_BAD_PAGE 5
372 #define TAINT_OVERRIDDEN_ACPI_TABLE 8
374 #define TAINT_CRAP 10
375 #define TAINT_FIRMWARE_WORKAROUND 11
377 extern void dump_stack(void) __cold;
384 extern void hex_dump_to_buffer(const void *buf, size_t len,
385 int rowsize, int groupsize,
386 char *linebuf, size_t linebuflen, bool ascii);
387 extern void print_hex_dump(const char *level, const char *prefix_str,
388 int prefix_type, int rowsize, int groupsize,
389 const void *buf, size_t len, bool ascii);
390 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
391 const void *buf, size_t len);
393 extern const char hex_asc[];
394 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
395 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
397 static inline char *pack_hex_byte(char *buf, u8 byte)
399 *buf++ = hex_asc_hi(byte);
400 *buf++ = hex_asc_lo(byte);
404 extern int hex_to_bin(char ch);
407 #define pr_fmt(fmt) fmt
410 #define pr_emerg(fmt, ...) \
411 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
412 #define pr_alert(fmt, ...) \
413 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
414 #define pr_crit(fmt, ...) \
415 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
416 #define pr_err(fmt, ...) \
417 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
418 #define pr_warning(fmt, ...) \
419 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
420 #define pr_warn pr_warning
421 #define pr_notice(fmt, ...) \
422 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
423 #define pr_info(fmt, ...) \
424 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
425 #define pr_cont(fmt, ...) \
426 printk(KERN_CONT fmt, ##__VA_ARGS__)
428 /* pr_devel() should produce zero code unless DEBUG is defined */
430 #define pr_devel(fmt, ...) \
431 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
433 #define pr_devel(fmt, ...) \
434 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
437 /* If you are writing a driver, please use dev_dbg instead */
439 #define pr_debug(fmt, ...) \
440 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
441 #elif defined(CONFIG_DYNAMIC_DEBUG)
442 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
443 #define pr_debug(fmt, ...) \
444 dynamic_pr_debug(fmt, ##__VA_ARGS__)
446 #define pr_debug(fmt, ...) \
447 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
451 * ratelimited messages with local ratelimit_state,
452 * no local ratelimit_state used in the !PRINTK case
455 #define printk_ratelimited(fmt, ...) ({ \
456 static DEFINE_RATELIMIT_STATE(_rs, \
457 DEFAULT_RATELIMIT_INTERVAL, \
458 DEFAULT_RATELIMIT_BURST); \
460 if (__ratelimit(&_rs)) \
461 printk(fmt, ##__VA_ARGS__); \
464 /* No effect, but we still get type checking even in the !PRINTK case: */
465 #define printk_ratelimited printk
468 #define pr_emerg_ratelimited(fmt, ...) \
469 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
470 #define pr_alert_ratelimited(fmt, ...) \
471 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
472 #define pr_crit_ratelimited(fmt, ...) \
473 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
474 #define pr_err_ratelimited(fmt, ...) \
475 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
476 #define pr_warning_ratelimited(fmt, ...) \
477 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
478 #define pr_warn_ratelimited pr_warning_ratelimited
479 #define pr_notice_ratelimited(fmt, ...) \
480 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
481 #define pr_info_ratelimited(fmt, ...) \
482 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
483 /* no pr_cont_ratelimited, don't do that... */
484 /* If you are writing a driver, please use dev_dbg instead */
486 #define pr_debug_ratelimited(fmt, ...) \
487 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
489 #define pr_debug_ratelimited(fmt, ...) \
490 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
491 ##__VA_ARGS__); 0; })
495 * General tracing related utility functions - trace_printk(),
496 * tracing_on/tracing_off and tracing_start()/tracing_stop
498 * Use tracing_on/tracing_off when you want to quickly turn on or off
499 * tracing. It simply enables or disables the recording of the trace events.
500 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
501 * file, which gives a means for the kernel and userspace to interact.
502 * Place a tracing_off() in the kernel where you want tracing to end.
503 * From user space, examine the trace, and then echo 1 > tracing_on
504 * to continue tracing.
506 * tracing_stop/tracing_start has slightly more overhead. It is used
507 * by things like suspend to ram where disabling the recording of the
508 * trace is not enough, but tracing must actually stop because things
509 * like calling smp_processor_id() may crash the system.
511 * Most likely, you want to use tracing_on/tracing_off.
513 #ifdef CONFIG_RING_BUFFER
514 void tracing_on(void);
515 void tracing_off(void);
516 /* trace_off_permanent stops recording with no way to bring it back */
517 void tracing_off_permanent(void);
518 int tracing_is_on(void);
520 static inline void tracing_on(void) { }
521 static inline void tracing_off(void) { }
522 static inline void tracing_off_permanent(void) { }
523 static inline int tracing_is_on(void) { return 0; }
526 enum ftrace_dump_mode {
532 #ifdef CONFIG_TRACING
533 extern void tracing_start(void);
534 extern void tracing_stop(void);
535 extern void ftrace_off_permanent(void);
537 static inline void __attribute__ ((format (printf, 1, 2)))
538 ____trace_printk_check_format(const char *fmt, ...)
541 #define __trace_printk_check_format(fmt, args...) \
544 ____trace_printk_check_format(fmt, ##args); \
548 * trace_printk - printf formatting in the ftrace buffer
549 * @fmt: the printf format for printing
551 * Note: __trace_printk is an internal function for trace_printk and
552 * the @ip is passed in via the trace_printk macro.
554 * This function allows a kernel developer to debug fast path sections
555 * that printk is not appropriate for. By scattering in various
556 * printk like tracing in the code, a developer can quickly see
557 * where problems are occurring.
559 * This is intended as a debugging tool for the developer only.
560 * Please refrain from leaving trace_printks scattered around in
564 #define trace_printk(fmt, args...) \
566 __trace_printk_check_format(fmt, ##args); \
567 if (__builtin_constant_p(fmt)) { \
568 static const char *trace_printk_fmt \
569 __attribute__((section("__trace_printk_fmt"))) = \
570 __builtin_constant_p(fmt) ? fmt : NULL; \
572 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
574 __trace_printk(_THIS_IP_, fmt, ##args); \
578 __trace_bprintk(unsigned long ip, const char *fmt, ...)
579 __attribute__ ((format (printf, 2, 3)));
582 __trace_printk(unsigned long ip, const char *fmt, ...)
583 __attribute__ ((format (printf, 2, 3)));
585 extern void trace_dump_stack(void);
588 * The double __builtin_constant_p is because gcc will give us an error
589 * if we try to allocate the static variable to fmt if it is not a
590 * constant. Even with the outer if statement.
592 #define ftrace_vprintk(fmt, vargs) \
594 if (__builtin_constant_p(fmt)) { \
595 static const char *trace_printk_fmt \
596 __attribute__((section("__trace_printk_fmt"))) = \
597 __builtin_constant_p(fmt) ? fmt : NULL; \
599 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
601 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
605 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
608 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
610 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
613 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
615 static inline void tracing_start(void) { }
616 static inline void tracing_stop(void) { }
617 static inline void ftrace_off_permanent(void) { }
618 static inline void trace_dump_stack(void) { }
620 trace_printk(const char *fmt, ...)
625 ftrace_vprintk(const char *fmt, va_list ap)
629 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
630 #endif /* CONFIG_TRACING */
633 * min()/max()/clamp() macros that also do
634 * strict type-checking.. See the
635 * "unnecessary" pointer comparison.
637 #define min(x, y) ({ \
638 typeof(x) _min1 = (x); \
639 typeof(y) _min2 = (y); \
640 (void) (&_min1 == &_min2); \
641 _min1 < _min2 ? _min1 : _min2; })
643 #define max(x, y) ({ \
644 typeof(x) _max1 = (x); \
645 typeof(y) _max2 = (y); \
646 (void) (&_max1 == &_max2); \
647 _max1 > _max2 ? _max1 : _max2; })
650 * clamp - return a value clamped to a given range with strict typechecking
651 * @val: current value
652 * @min: minimum allowable value
653 * @max: maximum allowable value
655 * This macro does strict typechecking of min/max to make sure they are of the
656 * same type as val. See the unnecessary pointer comparisons.
658 #define clamp(val, min, max) ({ \
659 typeof(val) __val = (val); \
660 typeof(min) __min = (min); \
661 typeof(max) __max = (max); \
662 (void) (&__val == &__min); \
663 (void) (&__val == &__max); \
664 __val = __val < __min ? __min: __val; \
665 __val > __max ? __max: __val; })
668 * ..and if you can't take the strict
669 * types, you can specify one yourself.
671 * Or not use min/max/clamp at all, of course.
673 #define min_t(type, x, y) ({ \
676 __min1 < __min2 ? __min1: __min2; })
678 #define max_t(type, x, y) ({ \
681 __max1 > __max2 ? __max1: __max2; })
684 * clamp_t - return a value clamped to a given range using a given type
685 * @type: the type of variable to use
686 * @val: current value
687 * @min: minimum allowable value
688 * @max: maximum allowable value
690 * This macro does no typechecking and uses temporary variables of type
691 * 'type' to make all the comparisons.
693 #define clamp_t(type, val, min, max) ({ \
694 type __val = (val); \
695 type __min = (min); \
696 type __max = (max); \
697 __val = __val < __min ? __min: __val; \
698 __val > __max ? __max: __val; })
701 * clamp_val - return a value clamped to a given range using val's type
702 * @val: current value
703 * @min: minimum allowable value
704 * @max: maximum allowable value
706 * This macro does no typechecking and uses temporary variables of whatever
707 * type the input argument 'val' is. This is useful when val is an unsigned
708 * type and min and max are literals that will otherwise be assigned a signed
711 #define clamp_val(val, min, max) ({ \
712 typeof(val) __val = (val); \
713 typeof(val) __min = (min); \
714 typeof(val) __max = (max); \
715 __val = __val < __min ? __min: __val; \
716 __val > __max ? __max: __val; })
720 * swap - swap value of @a and @b
723 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
726 * container_of - cast a member of a structure out to the containing structure
727 * @ptr: the pointer to the member.
728 * @type: the type of the container struct this is embedded in.
729 * @member: the name of the member within the struct.
732 #define container_of(ptr, type, member) ({ \
733 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
734 (type *)( (char *)__mptr - offsetof(type,member) );})
737 extern int do_sysinfo(struct sysinfo *info);
739 #endif /* __KERNEL__ */
741 #define SI_LOAD_SHIFT 16
743 long uptime; /* Seconds since boot */
744 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
745 unsigned long totalram; /* Total usable main memory size */
746 unsigned long freeram; /* Available memory size */
747 unsigned long sharedram; /* Amount of shared memory */
748 unsigned long bufferram; /* Memory used by buffers */
749 unsigned long totalswap; /* Total swap space size */
750 unsigned long freeswap; /* swap space still available */
751 unsigned short procs; /* Number of current processes */
752 unsigned short pad; /* explicit padding for m68k */
753 unsigned long totalhigh; /* Total high memory size */
754 unsigned long freehigh; /* Available high memory size */
755 unsigned int mem_unit; /* Memory unit size in bytes */
756 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
759 /* Force a compilation error if condition is true */
760 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
762 /* Force a compilation error if condition is constant and true */
763 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
765 /* Force a compilation error if a constant expression is not a power of 2 */
766 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
767 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
769 /* Force a compilation error if condition is true, but also produce a
770 result (of value 0 and type size_t), so the expression can be used
771 e.g. in a structure initializer (or where-ever else comma expressions
772 aren't permitted). */
773 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
774 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
776 /* Trap pasters of __FUNCTION__ at compile-time */
777 #define __FUNCTION__ (__func__)
779 /* This helps us to avoid #ifdef CONFIG_NUMA */
786 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
787 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
788 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD