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Add a dummy printk function for the maintenance of unused printks
[net-next-2.6.git] / include / linux / kernel.h
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CommitLineData
1#ifndef _LINUX_KERNEL_H
2#define _LINUX_KERNEL_H
3
4/*
5 * 'kernel.h' contains some often-used function prototypes etc
6 */
7#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
8#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
9
10#ifdef __KERNEL__
11
12#include <stdarg.h>
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>
22#include <asm/bug.h>
23
24extern const char linux_banner[];
25extern const char linux_proc_banner[];
26
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)
39
40#define STACK_MAGIC 0xdeadbeef
41
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)
46
47#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
48
49/*
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.
54 */
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))
58
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 DIV_ROUND_CLOSEST(x, divisor)( \
63{ \
64 typeof(divisor) __divisor = divisor; \
65 (((x) + ((__divisor) / 2)) / (__divisor)); \
66} \
67)
68
69#define _RET_IP_ (unsigned long)__builtin_return_address(0)
70#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
71
72#ifdef CONFIG_LBDAF
73# include <asm/div64.h>
74# define sector_div(a, b) do_div(a, b)
75#else
76# define sector_div(n, b)( \
77{ \
78 int _res; \
79 _res = (n) % (b); \
80 (n) /= (b); \
81 _res; \
82} \
83)
84#endif
85
86/**
87 * upper_32_bits - return bits 32-63 of a number
88 * @n: the number we're accessing
89 *
90 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
91 * the "right shift count >= width of type" warning when that quantity is
92 * 32-bits.
93 */
94#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
95
96/**
97 * lower_32_bits - return bits 0-31 of a number
98 * @n: the number we're accessing
99 */
100#define lower_32_bits(n) ((u32)(n))
101
102#define KERN_EMERG "<0>" /* system is unusable */
103#define KERN_ALERT "<1>" /* action must be taken immediately */
104#define KERN_CRIT "<2>" /* critical conditions */
105#define KERN_ERR "<3>" /* error conditions */
106#define KERN_WARNING "<4>" /* warning conditions */
107#define KERN_NOTICE "<5>" /* normal but significant condition */
108#define KERN_INFO "<6>" /* informational */
109#define KERN_DEBUG "<7>" /* debug-level messages */
110
111/* Use the default kernel loglevel */
112#define KERN_DEFAULT "<d>"
113/*
114 * Annotation for a "continued" line of log printout (only done after a
115 * line that had no enclosing \n). Only to be used by core/arch code
116 * during early bootup (a continued line is not SMP-safe otherwise).
117 */
118#define KERN_CONT "<c>"
119
120extern int console_printk[];
121
122#define console_loglevel (console_printk[0])
123#define default_message_loglevel (console_printk[1])
124#define minimum_console_loglevel (console_printk[2])
125#define default_console_loglevel (console_printk[3])
126
127struct completion;
128struct pt_regs;
129struct user;
130
131#ifdef CONFIG_PREEMPT_VOLUNTARY
132extern int _cond_resched(void);
133# define might_resched() _cond_resched()
134#else
135# define might_resched() do { } while (0)
136#endif
137
138#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
139 void __might_sleep(const char *file, int line, int preempt_offset);
140/**
141 * might_sleep - annotation for functions that can sleep
142 *
143 * this macro will print a stack trace if it is executed in an atomic
144 * context (spinlock, irq-handler, ...).
145 *
146 * This is a useful debugging help to be able to catch problems early and not
147 * be bitten later when the calling function happens to sleep when it is not
148 * supposed to.
149 */
150# define might_sleep() \
151 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
152#else
153 static inline void __might_sleep(const char *file, int line,
154 int preempt_offset) { }
155# define might_sleep() do { might_resched(); } while (0)
156#endif
157
158#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
159
160#define abs(x) ({ \
161 long __x = (x); \
162 (__x < 0) ? -__x : __x; \
163 })
164
165#ifdef CONFIG_PROVE_LOCKING
166void might_fault(void);
167#else
168static inline void might_fault(void)
169{
170 might_sleep();
171}
172#endif
173
174struct va_format {
175 const char *fmt;
176 va_list *va;
177};
178
179extern struct atomic_notifier_head panic_notifier_list;
180extern long (*panic_blink)(int state);
181NORET_TYPE void panic(const char * fmt, ...)
182 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
183extern void oops_enter(void);
184extern void oops_exit(void);
185void print_oops_end_marker(void);
186extern int oops_may_print(void);
187NORET_TYPE void do_exit(long error_code)
188 ATTRIB_NORET;
189NORET_TYPE void complete_and_exit(struct completion *, long)
190 ATTRIB_NORET;
191extern unsigned long simple_strtoul(const char *,char **,unsigned int);
192extern long simple_strtol(const char *,char **,unsigned int);
193extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
194extern long long simple_strtoll(const char *,char **,unsigned int);
195extern int strict_strtoul(const char *, unsigned int, unsigned long *);
196extern int strict_strtol(const char *, unsigned int, long *);
197extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
198extern int strict_strtoll(const char *, unsigned int, long long *);
199extern int sprintf(char * buf, const char * fmt, ...)
200 __attribute__ ((format (printf, 2, 3)));
201extern int vsprintf(char *buf, const char *, va_list)
202 __attribute__ ((format (printf, 2, 0)));
203extern int snprintf(char * buf, size_t size, const char * fmt, ...)
204 __attribute__ ((format (printf, 3, 4)));
205extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
206 __attribute__ ((format (printf, 3, 0)));
207extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
208 __attribute__ ((format (printf, 3, 4)));
209extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
210 __attribute__ ((format (printf, 3, 0)));
211extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
212 __attribute__ ((format (printf, 2, 3)));
213extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
214
215extern int sscanf(const char *, const char *, ...)
216 __attribute__ ((format (scanf, 2, 3)));
217extern int vsscanf(const char *, const char *, va_list)
218 __attribute__ ((format (scanf, 2, 0)));
219
220extern int get_option(char **str, int *pint);
221extern char *get_options(const char *str, int nints, int *ints);
222extern unsigned long long memparse(const char *ptr, char **retptr);
223
224extern int core_kernel_text(unsigned long addr);
225extern int __kernel_text_address(unsigned long addr);
226extern int kernel_text_address(unsigned long addr);
227extern int func_ptr_is_kernel_text(void *ptr);
228
229struct pid;
230extern struct pid *session_of_pgrp(struct pid *pgrp);
231
232/*
233 * FW_BUG
234 * Add this to a message where you are sure the firmware is buggy or behaves
235 * really stupid or out of spec. Be aware that the responsible BIOS developer
236 * should be able to fix this issue or at least get a concrete idea of the
237 * problem by reading your message without the need of looking at the kernel
238 * code.
239 *
240 * Use it for definite and high priority BIOS bugs.
241 *
242 * FW_WARN
243 * Use it for not that clear (e.g. could the kernel messed up things already?)
244 * and medium priority BIOS bugs.
245 *
246 * FW_INFO
247 * Use this one if you want to tell the user or vendor about something
248 * suspicious, but generally harmless related to the firmware.
249 *
250 * Use it for information or very low priority BIOS bugs.
251 */
252#define FW_BUG "[Firmware Bug]: "
253#define FW_WARN "[Firmware Warn]: "
254#define FW_INFO "[Firmware Info]: "
255
256/*
257 * HW_ERR
258 * Add this to a message for hardware errors, so that user can report
259 * it to hardware vendor instead of LKML or software vendor.
260 */
261#define HW_ERR "[Hardware Error]: "
262
263#ifdef CONFIG_PRINTK
264asmlinkage int vprintk(const char *fmt, va_list args)
265 __attribute__ ((format (printf, 1, 0)));
266asmlinkage int printk(const char * fmt, ...)
267 __attribute__ ((format (printf, 1, 2))) __cold;
268
269extern int __printk_ratelimit(const char *func);
270#define printk_ratelimit() __printk_ratelimit(__func__)
271extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
272 unsigned int interval_msec);
273
274extern int printk_delay_msec;
275
276/*
277 * Print a one-time message (analogous to WARN_ONCE() et al):
278 */
279#define printk_once(x...) ({ \
280 static bool __print_once; \
281 \
282 if (!__print_once) { \
283 __print_once = true; \
284 printk(x); \
285 } \
286})
287
288void log_buf_kexec_setup(void);
289#else
290static inline int vprintk(const char *s, va_list args)
291 __attribute__ ((format (printf, 1, 0)));
292static inline int vprintk(const char *s, va_list args) { return 0; }
293static inline int printk(const char *s, ...)
294 __attribute__ ((format (printf, 1, 2)));
295static inline int __cold printk(const char *s, ...) { return 0; }
296static inline int printk_ratelimit(void) { return 0; }
297static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
298 unsigned int interval_msec) \
299 { return false; }
300
301/* No effect, but we still get type checking even in the !PRINTK case: */
302#define printk_once(x...) printk(x)
303
304static inline void log_buf_kexec_setup(void)
305{
306}
307#endif
308
309/*
310 * Dummy printk for disabled debugging statements to use whilst maintaining
311 * gcc's format and side-effect checking.
312 */
313static inline __attribute__ ((format (printf, 1, 2)))
314int no_printk(const char *s, ...) { return 0; }
315
316extern int printk_needs_cpu(int cpu);
317extern void printk_tick(void);
318
319extern void asmlinkage __attribute__((format(printf, 1, 2)))
320 early_printk(const char *fmt, ...);
321
322unsigned long int_sqrt(unsigned long);
323
324static inline void console_silent(void)
325{
326 console_loglevel = 0;
327}
328
329static inline void console_verbose(void)
330{
331 if (console_loglevel)
332 console_loglevel = 15;
333}
334
335extern void bust_spinlocks(int yes);
336extern void wake_up_klogd(void);
337extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
338extern int panic_timeout;
339extern int panic_on_oops;
340extern int panic_on_unrecovered_nmi;
341extern int panic_on_io_nmi;
342extern const char *print_tainted(void);
343extern void add_taint(unsigned flag);
344extern int test_taint(unsigned flag);
345extern unsigned long get_taint(void);
346extern int root_mountflags;
347
348/* Values used for system_state */
349extern enum system_states {
350 SYSTEM_BOOTING,
351 SYSTEM_RUNNING,
352 SYSTEM_HALT,
353 SYSTEM_POWER_OFF,
354 SYSTEM_RESTART,
355 SYSTEM_SUSPEND_DISK,
356} system_state;
357
358#define TAINT_PROPRIETARY_MODULE 0
359#define TAINT_FORCED_MODULE 1
360#define TAINT_UNSAFE_SMP 2
361#define TAINT_FORCED_RMMOD 3
362#define TAINT_MACHINE_CHECK 4
363#define TAINT_BAD_PAGE 5
364#define TAINT_USER 6
365#define TAINT_DIE 7
366#define TAINT_OVERRIDDEN_ACPI_TABLE 8
367#define TAINT_WARN 9
368#define TAINT_CRAP 10
369#define TAINT_FIRMWARE_WORKAROUND 11
370
371extern void dump_stack(void) __cold;
372
373enum {
374 DUMP_PREFIX_NONE,
375 DUMP_PREFIX_ADDRESS,
376 DUMP_PREFIX_OFFSET
377};
378extern void hex_dump_to_buffer(const void *buf, size_t len,
379 int rowsize, int groupsize,
380 char *linebuf, size_t linebuflen, bool ascii);
381extern void print_hex_dump(const char *level, const char *prefix_str,
382 int prefix_type, int rowsize, int groupsize,
383 const void *buf, size_t len, bool ascii);
384extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
385 const void *buf, size_t len);
386
387extern const char hex_asc[];
388#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
389#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
390
391static inline char *pack_hex_byte(char *buf, u8 byte)
392{
393 *buf++ = hex_asc_hi(byte);
394 *buf++ = hex_asc_lo(byte);
395 return buf;
396}
397
398extern int hex_to_bin(char ch);
399
400#ifndef pr_fmt
401#define pr_fmt(fmt) fmt
402#endif
403
404#define pr_emerg(fmt, ...) \
405 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
406#define pr_alert(fmt, ...) \
407 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
408#define pr_crit(fmt, ...) \
409 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
410#define pr_err(fmt, ...) \
411 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
412#define pr_warning(fmt, ...) \
413 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
414#define pr_warn pr_warning
415#define pr_notice(fmt, ...) \
416 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
417#define pr_info(fmt, ...) \
418 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
419#define pr_cont(fmt, ...) \
420 printk(KERN_CONT fmt, ##__VA_ARGS__)
421
422/* pr_devel() should produce zero code unless DEBUG is defined */
423#ifdef DEBUG
424#define pr_devel(fmt, ...) \
425 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
426#else
427#define pr_devel(fmt, ...) \
428 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
429#endif
430
431/* If you are writing a driver, please use dev_dbg instead */
432#if defined(DEBUG)
433#define pr_debug(fmt, ...) \
434 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
435#elif defined(CONFIG_DYNAMIC_DEBUG)
436/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
437#define pr_debug(fmt, ...) \
438 dynamic_pr_debug(fmt, ##__VA_ARGS__)
439#else
440#define pr_debug(fmt, ...) \
441 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
442#endif
443
444/*
445 * ratelimited messages with local ratelimit_state,
446 * no local ratelimit_state used in the !PRINTK case
447 */
448#ifdef CONFIG_PRINTK
449#define printk_ratelimited(fmt, ...) ({ \
450 static DEFINE_RATELIMIT_STATE(_rs, \
451 DEFAULT_RATELIMIT_INTERVAL, \
452 DEFAULT_RATELIMIT_BURST); \
453 \
454 if (__ratelimit(&_rs)) \
455 printk(fmt, ##__VA_ARGS__); \
456})
457#else
458/* No effect, but we still get type checking even in the !PRINTK case: */
459#define printk_ratelimited printk
460#endif
461
462#define pr_emerg_ratelimited(fmt, ...) \
463 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
464#define pr_alert_ratelimited(fmt, ...) \
465 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
466#define pr_crit_ratelimited(fmt, ...) \
467 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
468#define pr_err_ratelimited(fmt, ...) \
469 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
470#define pr_warning_ratelimited(fmt, ...) \
471 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
472#define pr_warn_ratelimited pr_warning_ratelimited
473#define pr_notice_ratelimited(fmt, ...) \
474 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
475#define pr_info_ratelimited(fmt, ...) \
476 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
477/* no pr_cont_ratelimited, don't do that... */
478/* If you are writing a driver, please use dev_dbg instead */
479#if defined(DEBUG)
480#define pr_debug_ratelimited(fmt, ...) \
481 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
482#else
483#define pr_debug_ratelimited(fmt, ...) \
484 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
485 ##__VA_ARGS__); 0; })
486#endif
487
488/*
489 * General tracing related utility functions - trace_printk(),
490 * tracing_on/tracing_off and tracing_start()/tracing_stop
491 *
492 * Use tracing_on/tracing_off when you want to quickly turn on or off
493 * tracing. It simply enables or disables the recording of the trace events.
494 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
495 * file, which gives a means for the kernel and userspace to interact.
496 * Place a tracing_off() in the kernel where you want tracing to end.
497 * From user space, examine the trace, and then echo 1 > tracing_on
498 * to continue tracing.
499 *
500 * tracing_stop/tracing_start has slightly more overhead. It is used
501 * by things like suspend to ram where disabling the recording of the
502 * trace is not enough, but tracing must actually stop because things
503 * like calling smp_processor_id() may crash the system.
504 *
505 * Most likely, you want to use tracing_on/tracing_off.
506 */
507#ifdef CONFIG_RING_BUFFER
508void tracing_on(void);
509void tracing_off(void);
510/* trace_off_permanent stops recording with no way to bring it back */
511void tracing_off_permanent(void);
512int tracing_is_on(void);
513#else
514static inline void tracing_on(void) { }
515static inline void tracing_off(void) { }
516static inline void tracing_off_permanent(void) { }
517static inline int tracing_is_on(void) { return 0; }
518#endif
519
520enum ftrace_dump_mode {
521 DUMP_NONE,
522 DUMP_ALL,
523 DUMP_ORIG,
524};
525
526#ifdef CONFIG_TRACING
527extern void tracing_start(void);
528extern void tracing_stop(void);
529extern void ftrace_off_permanent(void);
530
531static inline void __attribute__ ((format (printf, 1, 2)))
532____trace_printk_check_format(const char *fmt, ...)
533{
534}
535#define __trace_printk_check_format(fmt, args...) \
536do { \
537 if (0) \
538 ____trace_printk_check_format(fmt, ##args); \
539} while (0)
540
541/**
542 * trace_printk - printf formatting in the ftrace buffer
543 * @fmt: the printf format for printing
544 *
545 * Note: __trace_printk is an internal function for trace_printk and
546 * the @ip is passed in via the trace_printk macro.
547 *
548 * This function allows a kernel developer to debug fast path sections
549 * that printk is not appropriate for. By scattering in various
550 * printk like tracing in the code, a developer can quickly see
551 * where problems are occurring.
552 *
553 * This is intended as a debugging tool for the developer only.
554 * Please refrain from leaving trace_printks scattered around in
555 * your code.
556 */
557
558#define trace_printk(fmt, args...) \
559do { \
560 __trace_printk_check_format(fmt, ##args); \
561 if (__builtin_constant_p(fmt)) { \
562 static const char *trace_printk_fmt \
563 __attribute__((section("__trace_printk_fmt"))) = \
564 __builtin_constant_p(fmt) ? fmt : NULL; \
565 \
566 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
567 } else \
568 __trace_printk(_THIS_IP_, fmt, ##args); \
569} while (0)
570
571extern int
572__trace_bprintk(unsigned long ip, const char *fmt, ...)
573 __attribute__ ((format (printf, 2, 3)));
574
575extern int
576__trace_printk(unsigned long ip, const char *fmt, ...)
577 __attribute__ ((format (printf, 2, 3)));
578
579extern void trace_dump_stack(void);
580
581/*
582 * The double __builtin_constant_p is because gcc will give us an error
583 * if we try to allocate the static variable to fmt if it is not a
584 * constant. Even with the outer if statement.
585 */
586#define ftrace_vprintk(fmt, vargs) \
587do { \
588 if (__builtin_constant_p(fmt)) { \
589 static const char *trace_printk_fmt \
590 __attribute__((section("__trace_printk_fmt"))) = \
591 __builtin_constant_p(fmt) ? fmt : NULL; \
592 \
593 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
594 } else \
595 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
596} while (0)
597
598extern int
599__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
600
601extern int
602__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
603
604extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
605#else
606static inline int
607trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
608
609static inline void tracing_start(void) { }
610static inline void tracing_stop(void) { }
611static inline void ftrace_off_permanent(void) { }
612static inline void trace_dump_stack(void) { }
613static inline int
614trace_printk(const char *fmt, ...)
615{
616 return 0;
617}
618static inline int
619ftrace_vprintk(const char *fmt, va_list ap)
620{
621 return 0;
622}
623static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
624#endif /* CONFIG_TRACING */
625
626/*
627 * min()/max()/clamp() macros that also do
628 * strict type-checking.. See the
629 * "unnecessary" pointer comparison.
630 */
631#define min(x, y) ({ \
632 typeof(x) _min1 = (x); \
633 typeof(y) _min2 = (y); \
634 (void) (&_min1 == &_min2); \
635 _min1 < _min2 ? _min1 : _min2; })
636
637#define max(x, y) ({ \
638 typeof(x) _max1 = (x); \
639 typeof(y) _max2 = (y); \
640 (void) (&_max1 == &_max2); \
641 _max1 > _max2 ? _max1 : _max2; })
642
643/**
644 * clamp - return a value clamped to a given range with strict typechecking
645 * @val: current value
646 * @min: minimum allowable value
647 * @max: maximum allowable value
648 *
649 * This macro does strict typechecking of min/max to make sure they are of the
650 * same type as val. See the unnecessary pointer comparisons.
651 */
652#define clamp(val, min, max) ({ \
653 typeof(val) __val = (val); \
654 typeof(min) __min = (min); \
655 typeof(max) __max = (max); \
656 (void) (&__val == &__min); \
657 (void) (&__val == &__max); \
658 __val = __val < __min ? __min: __val; \
659 __val > __max ? __max: __val; })
660
661/*
662 * ..and if you can't take the strict
663 * types, you can specify one yourself.
664 *
665 * Or not use min/max/clamp at all, of course.
666 */
667#define min_t(type, x, y) ({ \
668 type __min1 = (x); \
669 type __min2 = (y); \
670 __min1 < __min2 ? __min1: __min2; })
671
672#define max_t(type, x, y) ({ \
673 type __max1 = (x); \
674 type __max2 = (y); \
675 __max1 > __max2 ? __max1: __max2; })
676
677/**
678 * clamp_t - return a value clamped to a given range using a given type
679 * @type: the type of variable to use
680 * @val: current value
681 * @min: minimum allowable value
682 * @max: maximum allowable value
683 *
684 * This macro does no typechecking and uses temporary variables of type
685 * 'type' to make all the comparisons.
686 */
687#define clamp_t(type, val, min, max) ({ \
688 type __val = (val); \
689 type __min = (min); \
690 type __max = (max); \
691 __val = __val < __min ? __min: __val; \
692 __val > __max ? __max: __val; })
693
694/**
695 * clamp_val - return a value clamped to a given range using val's type
696 * @val: current value
697 * @min: minimum allowable value
698 * @max: maximum allowable value
699 *
700 * This macro does no typechecking and uses temporary variables of whatever
701 * type the input argument 'val' is. This is useful when val is an unsigned
702 * type and min and max are literals that will otherwise be assigned a signed
703 * integer type.
704 */
705#define clamp_val(val, min, max) ({ \
706 typeof(val) __val = (val); \
707 typeof(val) __min = (min); \
708 typeof(val) __max = (max); \
709 __val = __val < __min ? __min: __val; \
710 __val > __max ? __max: __val; })
711
712
713/*
714 * swap - swap value of @a and @b
715 */
716#define swap(a, b) \
717 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
718
719/**
720 * container_of - cast a member of a structure out to the containing structure
721 * @ptr: the pointer to the member.
722 * @type: the type of the container struct this is embedded in.
723 * @member: the name of the member within the struct.
724 *
725 */
726#define container_of(ptr, type, member) ({ \
727 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
728 (type *)( (char *)__mptr - offsetof(type,member) );})
729
730struct sysinfo;
731extern int do_sysinfo(struct sysinfo *info);
732
733#endif /* __KERNEL__ */
734
735#define SI_LOAD_SHIFT 16
736struct sysinfo {
737 long uptime; /* Seconds since boot */
738 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
739 unsigned long totalram; /* Total usable main memory size */
740 unsigned long freeram; /* Available memory size */
741 unsigned long sharedram; /* Amount of shared memory */
742 unsigned long bufferram; /* Memory used by buffers */
743 unsigned long totalswap; /* Total swap space size */
744 unsigned long freeswap; /* swap space still available */
745 unsigned short procs; /* Number of current processes */
746 unsigned short pad; /* explicit padding for m68k */
747 unsigned long totalhigh; /* Total high memory size */
748 unsigned long freehigh; /* Available high memory size */
749 unsigned int mem_unit; /* Memory unit size in bytes */
750 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
751};
752
753/* Force a compilation error if condition is true */
754#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
755
756/* Force a compilation error if condition is constant and true */
757#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
758
759/* Force a compilation error if a constant expression is not a power of 2 */
760#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
761 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
762
763/* Force a compilation error if condition is true, but also produce a
764 result (of value 0 and type size_t), so the expression can be used
765 e.g. in a structure initializer (or where-ever else comma expressions
766 aren't permitted). */
767#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
768#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
769
770/* Trap pasters of __FUNCTION__ at compile-time */
771#define __FUNCTION__ (__func__)
772
773/* This helps us to avoid #ifdef CONFIG_NUMA */
774#ifdef CONFIG_NUMA
775#define NUMA_BUILD 1
776#else
777#define NUMA_BUILD 0
778#endif
779
780/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
781#ifdef CONFIG_FTRACE_MCOUNT_RECORD
782# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
783#endif
784
785#endif
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