Line data Source code
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/dynamic_debug.h>
19 : #include <asm/byteorder.h>
20 : #include <asm/bug.h>
21 :
22 : extern const char linux_banner[];
23 : extern const char linux_proc_banner[];
24 :
25 : #define USHORT_MAX ((u16)(~0U))
26 : #define SHORT_MAX ((s16)(USHORT_MAX>>1))
27 : #define SHORT_MIN (-SHORT_MAX - 1)
28 : #define INT_MAX ((int)(~0U>>1))
29 : #define INT_MIN (-INT_MAX - 1)
30 : #define UINT_MAX (~0U)
31 : #define LONG_MAX ((long)(~0UL>>1))
32 : #define LONG_MIN (-LONG_MAX - 1)
33 : #define ULONG_MAX (~0UL)
34 : #define LLONG_MAX ((long long)(~0ULL>>1))
35 : #define LLONG_MIN (-LLONG_MAX - 1)
36 : #define ULLONG_MAX (~0ULL)
37 :
38 : #define STACK_MAGIC 0xdeadbeef
39 :
40 : #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
41 : #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
42 : #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
43 : #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
44 :
45 : #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
46 :
47 : #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
48 : #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
49 : #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
50 : #define DIV_ROUND_CLOSEST(x, divisor)( \
51 : { \
52 : typeof(divisor) __divisor = divisor; \
53 : (((x) + ((__divisor) / 2)) / (__divisor)); \
54 : } \
55 : )
56 :
57 : #define _RET_IP_ (unsigned long)__builtin_return_address(0)
58 : #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
59 :
60 : #ifdef CONFIG_LBDAF
61 : # include <asm/div64.h>
62 : # define sector_div(a, b) do_div(a, b)
63 : #else
64 : # define sector_div(n, b)( \
65 : { \
66 : int _res; \
67 : _res = (n) % (b); \
68 : (n) /= (b); \
69 : _res; \
70 : } \
71 : )
72 : #endif
73 :
74 : /**
75 : * upper_32_bits - return bits 32-63 of a number
76 : * @n: the number we're accessing
77 : *
78 : * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
79 : * the "right shift count >= width of type" warning when that quantity is
80 : * 32-bits.
81 : */
82 : #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
83 :
84 : /**
85 : * lower_32_bits - return bits 0-31 of a number
86 : * @n: the number we're accessing
87 : */
88 : #define lower_32_bits(n) ((u32)(n))
89 :
90 : #define KERN_EMERG "<0>" /* system is unusable */
91 : #define KERN_ALERT "<1>" /* action must be taken immediately */
92 : #define KERN_CRIT "<2>" /* critical conditions */
93 : #define KERN_ERR "<3>" /* error conditions */
94 : #define KERN_WARNING "<4>" /* warning conditions */
95 : #define KERN_NOTICE "<5>" /* normal but significant condition */
96 : #define KERN_INFO "<6>" /* informational */
97 : #define KERN_DEBUG "<7>" /* debug-level messages */
98 :
99 : /* Use the default kernel loglevel */
100 : #define KERN_DEFAULT "<d>"
101 : /*
102 : * Annotation for a "continued" line of log printout (only done after a
103 : * line that had no enclosing \n). Only to be used by core/arch code
104 : * during early bootup (a continued line is not SMP-safe otherwise).
105 : */
106 : #define KERN_CONT "<c>"
107 :
108 : extern int console_printk[];
109 1 :
110 : #define console_loglevel (console_printk[0])
111 : #define default_message_loglevel (console_printk[1])
112 : #define minimum_console_loglevel (console_printk[2])
113 : #define default_console_loglevel (console_printk[3])
114 :
115 : struct completion;
116 : struct pt_regs;
117 : struct user;
118 :
119 : #ifdef CONFIG_PREEMPT_VOLUNTARY
120 : extern int _cond_resched(void);
121 : # define might_resched() _cond_resched()
122 : #else
123 : # define might_resched() do { } while (0)
124 : #endif
125 :
126 : #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
127 : void __might_sleep(char *file, int line, int preempt_offset);
128 : /**
129 : * might_sleep - annotation for functions that can sleep
130 : *
131 : * this macro will print a stack trace if it is executed in an atomic
132 : * context (spinlock, irq-handler, ...).
133 : *
134 : * This is a useful debugging help to be able to catch problems early and not
135 : * be bitten later when the calling function happens to sleep when it is not
136 : * supposed to.
137 : */
138 : # define might_sleep() \
139 : do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
140 : #else
141 : static inline void __might_sleep(char *file, int line, int preempt_offset) { }
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 : long __x = (x); \
149 : (__x < 0) ? -__x : __x; \
150 : })
151 :
152 : #ifdef CONFIG_PROVE_LOCKING
153 : void might_fault(void);
154 : #else
155 : static inline void might_fault(void)
156 : {
157 1 : might_sleep();
158 1 : }
159 : #endif
160 :
161 : extern struct atomic_notifier_head panic_notifier_list;
162 : extern long (*panic_blink)(long time);
163 : NORET_TYPE void panic(const char * fmt, ...)
164 : __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
165 : extern void oops_enter(void);
166 : extern void oops_exit(void);
167 : extern int oops_may_print(void);
168 : NORET_TYPE void do_exit(long error_code)
169 : ATTRIB_NORET;
170 : NORET_TYPE void complete_and_exit(struct completion *, long)
171 : ATTRIB_NORET;
172 : extern unsigned long simple_strtoul(const char *,char **,unsigned int);
173 : extern long simple_strtol(const char *,char **,unsigned int);
174 : extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
175 : extern long long simple_strtoll(const char *,char **,unsigned int);
176 : extern int strict_strtoul(const char *, unsigned int, unsigned long *);
177 : extern int strict_strtol(const char *, unsigned int, long *);
178 : extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
179 : extern int strict_strtoll(const char *, unsigned int, long long *);
180 : extern int sprintf(char * buf, const char * fmt, ...)
181 : __attribute__ ((format (printf, 2, 3)));
182 : extern int vsprintf(char *buf, const char *, va_list)
183 : __attribute__ ((format (printf, 2, 0)));
184 : extern int snprintf(char * buf, size_t size, const char * fmt, ...)
185 : __attribute__ ((format (printf, 3, 4)));
186 : extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
187 : __attribute__ ((format (printf, 3, 0)));
188 : extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
189 : __attribute__ ((format (printf, 3, 4)));
190 : extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
191 : __attribute__ ((format (printf, 3, 0)));
192 : extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
193 : __attribute__ ((format (printf, 2, 3)));
194 : extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
195 :
196 : extern int sscanf(const char *, const char *, ...)
197 : __attribute__ ((format (scanf, 2, 3)));
198 : extern int vsscanf(const char *, const char *, va_list)
199 : __attribute__ ((format (scanf, 2, 0)));
200 :
201 : extern int get_option(char **str, int *pint);
202 : extern char *get_options(const char *str, int nints, int *ints);
203 : extern unsigned long long memparse(const char *ptr, char **retptr);
204 :
205 : extern int core_kernel_text(unsigned long addr);
206 : extern int __kernel_text_address(unsigned long addr);
207 : extern int kernel_text_address(unsigned long addr);
208 : extern int func_ptr_is_kernel_text(void *ptr);
209 1 :
210 : struct pid;
211 : extern 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
238 : asmlinkage int vprintk(const char *fmt, va_list args)
239 : __attribute__ ((format (printf, 1, 0)));
240 : asmlinkage int printk(const char * fmt, ...)
241 : __attribute__ ((format (printf, 1, 2))) __cold;
242 :
243 : extern int __printk_ratelimit(const char *func);
244 : #define printk_ratelimit() __printk_ratelimit(__func__)
245 : extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
246 : unsigned int interval_msec);
247 :
248 : extern int printk_delay_msec;
249 :
250 : /*
251 : * Print a one-time message (analogous to WARN_ONCE() et al):
252 : */
253 : #define printk_once(x...) ({ \
254 : static bool __print_once; \
255 : \
256 : if (!__print_once) { \
257 : __print_once = true; \
258 : printk(x); \
259 : } \
260 : })
261 :
262 : void log_buf_kexec_setup(void);
263 : #else
264 : static inline int vprintk(const char *s, va_list args)
265 : __attribute__ ((format (printf, 1, 0)));
266 : static inline int vprintk(const char *s, va_list args) { return 0; }
267 : static inline int printk(const char *s, ...)
268 : __attribute__ ((format (printf, 1, 2)));
269 : static inline int __cold printk(const char *s, ...) { return 0; }
270 : static inline int printk_ratelimit(void) { return 0; }
271 : static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
272 : unsigned int interval_msec) \
273 : { return false; }
274 :
275 : /* No effect, but we still get type checking even in the !PRINTK case: */
276 : #define printk_once(x...) printk(x)
277 :
278 : static inline void log_buf_kexec_setup(void)
279 : {
280 : }
281 : #endif
282 :
283 : extern int printk_needs_cpu(int cpu);
284 : extern void printk_tick(void);
285 :
286 : extern void asmlinkage __attribute__((format(printf, 1, 2)))
287 : early_printk(const char *fmt, ...);
288 :
289 : unsigned long int_sqrt(unsigned long);
290 :
291 : static inline void console_silent(void)
292 : {
293 : console_loglevel = 0;
294 : }
295 :
296 : static inline void console_verbose(void)
297 : {
298 : if (console_loglevel)
299 : console_loglevel = 15;
300 : }
301 :
302 : extern void bust_spinlocks(int yes);
303 : extern void wake_up_klogd(void);
304 : extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
305 : extern int panic_timeout;
306 : extern int panic_on_oops;
307 : extern int panic_on_unrecovered_nmi;
308 : extern int panic_on_io_nmi;
309 : extern const char *print_tainted(void);
310 : extern void add_taint(unsigned flag);
311 : extern int test_taint(unsigned flag);
312 : extern unsigned long get_taint(void);
313 : extern int root_mountflags;
314 :
315 : /* Values used for system_state */
316 : extern enum system_states {
317 : SYSTEM_BOOTING,
318 : SYSTEM_RUNNING,
319 : SYSTEM_HALT,
320 : SYSTEM_POWER_OFF,
321 : SYSTEM_RESTART,
322 : SYSTEM_SUSPEND_DISK,
323 : } system_state;
324 :
325 : #define TAINT_PROPRIETARY_MODULE 0
326 : #define TAINT_FORCED_MODULE 1
327 : #define TAINT_UNSAFE_SMP 2
328 : #define TAINT_FORCED_RMMOD 3
329 : #define TAINT_MACHINE_CHECK 4
330 : #define TAINT_BAD_PAGE 5
331 : #define TAINT_USER 6
332 : #define TAINT_DIE 7
333 : #define TAINT_OVERRIDDEN_ACPI_TABLE 8
334 : #define TAINT_WARN 9
335 : #define TAINT_CRAP 10
336 :
337 : extern void dump_stack(void) __cold;
338 :
339 : enum {
340 : DUMP_PREFIX_NONE,
341 : DUMP_PREFIX_ADDRESS,
342 : DUMP_PREFIX_OFFSET
343 : };
344 : extern void hex_dump_to_buffer(const void *buf, size_t len,
345 : int rowsize, int groupsize,
346 : char *linebuf, size_t linebuflen, bool ascii);
347 : extern void print_hex_dump(const char *level, const char *prefix_str,
348 : int prefix_type, int rowsize, int groupsize,
349 : const void *buf, size_t len, bool ascii);
350 : extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
351 : const void *buf, size_t len);
352 :
353 : extern const char hex_asc[];
354 : #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
355 : #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
356 :
357 : static inline char *pack_hex_byte(char *buf, u8 byte)
358 : {
359 : *buf++ = hex_asc_hi(byte);
360 : *buf++ = hex_asc_lo(byte);
361 : return buf;
362 : }
363 :
364 : #ifndef pr_fmt
365 : #define pr_fmt(fmt) fmt
366 : #endif
367 :
368 : #define pr_emerg(fmt, ...) \
369 : printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
370 : #define pr_alert(fmt, ...) \
371 : printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
372 : #define pr_crit(fmt, ...) \
373 : printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
374 : #define pr_err(fmt, ...) \
375 : printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
376 : #define pr_warning(fmt, ...) \
377 : printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
378 : #define pr_notice(fmt, ...) \
379 : printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
380 : #define pr_info(fmt, ...) \
381 : printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
382 : #define pr_cont(fmt, ...) \
383 : printk(KERN_CONT fmt, ##__VA_ARGS__)
384 :
385 : /* pr_devel() should produce zero code unless DEBUG is defined */
386 : #ifdef DEBUG
387 : #define pr_devel(fmt, ...) \
388 : printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
389 : #else
390 : #define pr_devel(fmt, ...) \
391 : ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
392 : #endif
393 :
394 : /* If you are writing a driver, please use dev_dbg instead */
395 : #if defined(DEBUG)
396 : #define pr_debug(fmt, ...) \
397 : printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
398 : #elif defined(CONFIG_DYNAMIC_DEBUG)
399 : /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
400 : #define pr_debug(fmt, ...) \
401 : dynamic_pr_debug(fmt, ##__VA_ARGS__)
402 : #else
403 : #define pr_debug(fmt, ...) \
404 : ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
405 : #endif
406 :
407 : /*
408 : * ratelimited messages with local ratelimit_state,
409 : * no local ratelimit_state used in the !PRINTK case
410 : */
411 : #ifdef CONFIG_PRINTK
412 : #define printk_ratelimited(fmt, ...) ({ \
413 : static struct ratelimit_state _rs = { \
414 : .interval = DEFAULT_RATELIMIT_INTERVAL, \
415 : .burst = DEFAULT_RATELIMIT_BURST, \
416 : }; \
417 : \
418 : if (!__ratelimit(&_rs)) \
419 : printk(fmt, ##__VA_ARGS__); \
420 : })
421 : #else
422 : /* No effect, but we still get type checking even in the !PRINTK case: */
423 : #define printk_ratelimited printk
424 : #endif
425 :
426 : #define pr_emerg_ratelimited(fmt, ...) \
427 : printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
428 : #define pr_alert_ratelimited(fmt, ...) \
429 : printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
430 : #define pr_crit_ratelimited(fmt, ...) \
431 : printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
432 : #define pr_err_ratelimited(fmt, ...) \
433 : printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
434 : #define pr_warning_ratelimited(fmt, ...) \
435 : printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
436 : #define pr_notice_ratelimited(fmt, ...) \
437 : printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
438 : #define pr_info_ratelimited(fmt, ...) \
439 : printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
440 : /* no pr_cont_ratelimited, don't do that... */
441 : /* If you are writing a driver, please use dev_dbg instead */
442 : #if defined(DEBUG)
443 : #define pr_debug_ratelimited(fmt, ...) \
444 : printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
445 : #else
446 : #define pr_debug_ratelimited(fmt, ...) \
447 : ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
448 : ##__VA_ARGS__); 0; })
449 : #endif
450 :
451 : /*
452 : * General tracing related utility functions - trace_printk(),
453 : * tracing_on/tracing_off and tracing_start()/tracing_stop
454 : *
455 : * Use tracing_on/tracing_off when you want to quickly turn on or off
456 : * tracing. It simply enables or disables the recording of the trace events.
457 : * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
458 : * file, which gives a means for the kernel and userspace to interact.
459 : * Place a tracing_off() in the kernel where you want tracing to end.
460 : * From user space, examine the trace, and then echo 1 > tracing_on
461 : * to continue tracing.
462 : *
463 : * tracing_stop/tracing_start has slightly more overhead. It is used
464 : * by things like suspend to ram where disabling the recording of the
465 : * trace is not enough, but tracing must actually stop because things
466 : * like calling smp_processor_id() may crash the system.
467 : *
468 : * Most likely, you want to use tracing_on/tracing_off.
469 : */
470 : #ifdef CONFIG_RING_BUFFER
471 : void tracing_on(void);
472 : void tracing_off(void);
473 : /* trace_off_permanent stops recording with no way to bring it back */
474 : void tracing_off_permanent(void);
475 : int tracing_is_on(void);
476 : #else
477 : static inline void tracing_on(void) { }
478 : static inline void tracing_off(void) { }
479 : static inline void tracing_off_permanent(void) { }
480 : static inline int tracing_is_on(void) { return 0; }
481 : #endif
482 : #ifdef CONFIG_TRACING
483 : extern void tracing_start(void);
484 : extern void tracing_stop(void);
485 : extern void ftrace_off_permanent(void);
486 :
487 : extern void
488 : ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
489 :
490 : static inline void __attribute__ ((format (printf, 1, 2)))
491 : ____trace_printk_check_format(const char *fmt, ...)
492 : {
493 : }
494 : #define __trace_printk_check_format(fmt, args...) \
495 : do { \
496 : if (0) \
497 : ____trace_printk_check_format(fmt, ##args); \
498 : } while (0)
499 :
500 : /**
501 : * trace_printk - printf formatting in the ftrace buffer
502 : * @fmt: the printf format for printing
503 : *
504 : * Note: __trace_printk is an internal function for trace_printk and
505 : * the @ip is passed in via the trace_printk macro.
506 : *
507 : * This function allows a kernel developer to debug fast path sections
508 : * that printk is not appropriate for. By scattering in various
509 : * printk like tracing in the code, a developer can quickly see
510 : * where problems are occurring.
511 : *
512 : * This is intended as a debugging tool for the developer only.
513 : * Please refrain from leaving trace_printks scattered around in
514 : * your code.
515 : */
516 :
517 : #define trace_printk(fmt, args...) \
518 : do { \
519 : __trace_printk_check_format(fmt, ##args); \
520 : if (__builtin_constant_p(fmt)) { \
521 : static const char *trace_printk_fmt \
522 : __attribute__((section("__trace_printk_fmt"))) = \
523 : __builtin_constant_p(fmt) ? fmt : NULL; \
524 : \
525 : __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
526 : } else \
527 : __trace_printk(_THIS_IP_, fmt, ##args); \
528 : } while (0)
529 :
530 : extern int
531 : __trace_bprintk(unsigned long ip, const char *fmt, ...)
532 : __attribute__ ((format (printf, 2, 3)));
533 :
534 : extern int
535 : __trace_printk(unsigned long ip, const char *fmt, ...)
536 : __attribute__ ((format (printf, 2, 3)));
537 :
538 : extern void trace_dump_stack(void);
539 :
540 : /*
541 : * The double __builtin_constant_p is because gcc will give us an error
542 : * if we try to allocate the static variable to fmt if it is not a
543 : * constant. Even with the outer if statement.
544 : */
545 : #define ftrace_vprintk(fmt, vargs) \
546 : do { \
547 : if (__builtin_constant_p(fmt)) { \
548 : static const char *trace_printk_fmt \
549 : __attribute__((section("__trace_printk_fmt"))) = \
550 : __builtin_constant_p(fmt) ? fmt : NULL; \
551 : \
552 : __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
553 : } else \
554 : __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
555 : } while (0)
556 :
557 : extern int
558 : __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
559 :
560 : extern int
561 : __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
562 :
563 : extern void ftrace_dump(void);
564 : #else
565 : static inline void
566 : ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
567 : static inline int
568 : trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
569 :
570 : static inline void tracing_start(void) { }
571 : static inline void tracing_stop(void) { }
572 : static inline void ftrace_off_permanent(void) { }
573 : static inline void trace_dump_stack(void) { }
574 : static inline int
575 : trace_printk(const char *fmt, ...)
576 : {
577 : return 0;
578 : }
579 : static inline int
580 : ftrace_vprintk(const char *fmt, va_list ap)
581 : {
582 : return 0;
583 : }
584 : static inline void ftrace_dump(void) { }
585 : #endif /* CONFIG_TRACING */
586 :
587 : /*
588 : * Display an IP address in readable format.
589 : */
590 :
591 : #define NIPQUAD(addr) \
592 : ((unsigned char *)&addr)[0], \
593 : ((unsigned char *)&addr)[1], \
594 : ((unsigned char *)&addr)[2], \
595 : ((unsigned char *)&addr)[3]
596 : #define NIPQUAD_FMT "%u.%u.%u.%u"
597 :
598 : /*
599 : * min()/max()/clamp() macros that also do
600 : * strict type-checking.. See the
601 : * "unnecessary" pointer comparison.
602 : */
603 : #define min(x, y) ({ \
604 : typeof(x) _min1 = (x); \
605 : typeof(y) _min2 = (y); \
606 : (void) (&_min1 == &_min2); \
607 : _min1 < _min2 ? _min1 : _min2; })
608 :
609 : #define max(x, y) ({ \
610 : typeof(x) _max1 = (x); \
611 : typeof(y) _max2 = (y); \
612 : (void) (&_max1 == &_max2); \
613 : _max1 > _max2 ? _max1 : _max2; })
614 :
615 : /**
616 : * clamp - return a value clamped to a given range with strict typechecking
617 : * @val: current value
618 : * @min: minimum allowable value
619 : * @max: maximum allowable value
620 : *
621 : * This macro does strict typechecking of min/max to make sure they are of the
622 : * same type as val. See the unnecessary pointer comparisons.
623 : */
624 : #define clamp(val, min, max) ({ \
625 : typeof(val) __val = (val); \
626 : typeof(min) __min = (min); \
627 : typeof(max) __max = (max); \
628 : (void) (&__val == &__min); \
629 : (void) (&__val == &__max); \
630 : __val = __val < __min ? __min: __val; \
631 : __val > __max ? __max: __val; })
632 :
633 : /*
634 : * ..and if you can't take the strict
635 : * types, you can specify one yourself.
636 : *
637 : * Or not use min/max/clamp at all, of course.
638 : */
639 : #define min_t(type, x, y) ({ \
640 : type __min1 = (x); \
641 : type __min2 = (y); \
642 : __min1 < __min2 ? __min1: __min2; })
643 :
644 : #define max_t(type, x, y) ({ \
645 : type __max1 = (x); \
646 : type __max2 = (y); \
647 : __max1 > __max2 ? __max1: __max2; })
648 :
649 : /**
650 : * clamp_t - return a value clamped to a given range using a given type
651 : * @type: the type of variable to use
652 : * @val: current value
653 : * @min: minimum allowable value
654 : * @max: maximum allowable value
655 : *
656 : * This macro does no typechecking and uses temporary variables of type
657 : * 'type' to make all the comparisons.
658 : */
659 : #define clamp_t(type, val, min, max) ({ \
660 : type __val = (val); \
661 : type __min = (min); \
662 : type __max = (max); \
663 : __val = __val < __min ? __min: __val; \
664 : __val > __max ? __max: __val; })
665 :
666 : /**
667 : * clamp_val - return a value clamped to a given range using val's type
668 : * @val: current value
669 : * @min: minimum allowable value
670 : * @max: maximum allowable value
671 : *
672 : * This macro does no typechecking and uses temporary variables of whatever
673 : * type the input argument 'val' is. This is useful when val is an unsigned
674 : * type and min and max are literals that will otherwise be assigned a signed
675 : * integer type.
676 : */
677 : #define clamp_val(val, min, max) ({ \
678 : typeof(val) __val = (val); \
679 : typeof(val) __min = (min); \
680 : typeof(val) __max = (max); \
681 : __val = __val < __min ? __min: __val; \
682 : __val > __max ? __max: __val; })
683 :
684 :
685 : /*
686 : * swap - swap value of @a and @b
687 : */
688 : #define swap(a, b) \
689 : do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
690 :
691 : /**
692 : * container_of - cast a member of a structure out to the containing structure
693 : * @ptr: the pointer to the member.
694 : * @type: the type of the container struct this is embedded in.
695 : * @member: the name of the member within the struct.
696 : *
697 : */
698 : #define container_of(ptr, type, member) ({ \
699 : const typeof( ((type *)0)->member ) *__mptr = (ptr); \
700 : (type *)( (char *)__mptr - offsetof(type,member) );})
701 :
702 : struct sysinfo;
703 : extern int do_sysinfo(struct sysinfo *info);
704 :
705 : #endif /* __KERNEL__ */
706 :
707 : #ifndef __EXPORTED_HEADERS__
708 : #ifndef __KERNEL__
709 : #warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders
710 : #endif /* __KERNEL__ */
711 : #endif /* __EXPORTED_HEADERS__ */
712 :
713 : #define SI_LOAD_SHIFT 16
714 : struct sysinfo {
715 : long uptime; /* Seconds since boot */
716 : unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
717 : unsigned long totalram; /* Total usable main memory size */
718 : unsigned long freeram; /* Available memory size */
719 : unsigned long sharedram; /* Amount of shared memory */
720 : unsigned long bufferram; /* Memory used by buffers */
721 : unsigned long totalswap; /* Total swap space size */
722 : unsigned long freeswap; /* swap space still available */
723 : unsigned short procs; /* Number of current processes */
724 : unsigned short pad; /* explicit padding for m68k */
725 : unsigned long totalhigh; /* Total high memory size */
726 : unsigned long freehigh; /* Available high memory size */
727 : unsigned int mem_unit; /* Memory unit size in bytes */
728 : char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
729 : };
730 :
731 : /* Force a compilation error if condition is true */
732 : #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
733 :
734 : /* Force a compilation error if condition is constant and true */
735 : #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
736 :
737 : /* Force a compilation error if a constant expression is not a power of 2 */
738 : #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
739 : BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
740 :
741 : /* Force a compilation error if condition is true, but also produce a
742 : result (of value 0 and type size_t), so the expression can be used
743 : e.g. in a structure initializer (or where-ever else comma expressions
744 : aren't permitted). */
745 : #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
746 : #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
747 :
748 : /* Trap pasters of __FUNCTION__ at compile-time */
749 : #define __FUNCTION__ (__func__)
750 :
751 : /* This helps us to avoid #ifdef CONFIG_NUMA */
752 : #ifdef CONFIG_NUMA
753 : #define NUMA_BUILD 1
754 : #else
755 : #define NUMA_BUILD 0
756 : #endif
757 :
758 : /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
759 : #ifdef CONFIG_FTRACE_MCOUNT_RECORD
760 : # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
761 : #endif
762 :
763 : #endif
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