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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 | /* |
48 | * This looks more complex than it should be. But we need to |
49 | * get the type for the ~ right in round_down (it needs to be |
50 | * as wide as the result!), and we want to evaluate the macro |
51 | * arguments just once each. |
52 | */ |
53 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) |
54 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) |
55 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) |
56 | |
57 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
58 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
59 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |
60 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
61 | { \ |
62 | typeof(divisor) __divisor = divisor; \ |
63 | (((x) + ((__divisor) / 2)) / (__divisor)); \ |
64 | } \ |
65 | ) |
66 | |
67 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
68 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) |
69 | |
70 | #ifdef CONFIG_LBDAF |
71 | # include <asm/div64.h> |
72 | # define sector_div(a, b) do_div(a, b) |
73 | #else |
74 | # define sector_div(n, b)( \ |
75 | { \ |
76 | int _res; \ |
77 | _res = (n) % (b); \ |
78 | (n) /= (b); \ |
79 | _res; \ |
80 | } \ |
81 | ) |
82 | #endif |
83 | |
84 | /** |
85 | * upper_32_bits - return bits 32-63 of a number |
86 | * @n: the number we're accessing |
87 | * |
88 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
89 | * the "right shift count >= width of type" warning when that quantity is |
90 | * 32-bits. |
91 | */ |
92 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
93 | |
94 | /** |
95 | * lower_32_bits - return bits 0-31 of a number |
96 | * @n: the number we're accessing |
97 | */ |
98 | #define lower_32_bits(n) ((u32)(n)) |
99 | |
100 | #define KERN_EMERG "<0>" /* system is unusable */ |
101 | #define KERN_ALERT "<1>" /* action must be taken immediately */ |
102 | #define KERN_CRIT "<2>" /* critical conditions */ |
103 | #define KERN_ERR "<3>" /* error conditions */ |
104 | #define KERN_WARNING "<4>" /* warning conditions */ |
105 | #define KERN_NOTICE "<5>" /* normal but significant condition */ |
106 | #define KERN_INFO "<6>" /* informational */ |
107 | #define KERN_DEBUG "<7>" /* debug-level messages */ |
108 | |
109 | /* Use the default kernel loglevel */ |
110 | #define KERN_DEFAULT "<d>" |
111 | /* |
112 | * Annotation for a "continued" line of log printout (only done after a |
113 | * line that had no enclosing \n). Only to be used by core/arch code |
114 | * during early bootup (a continued line is not SMP-safe otherwise). |
115 | */ |
116 | #define KERN_CONT "<c>" |
117 | |
118 | extern int console_printk[]; |
119 | |
120 | #define console_loglevel (console_printk[0]) |
121 | #define default_message_loglevel (console_printk[1]) |
122 | #define minimum_console_loglevel (console_printk[2]) |
123 | #define default_console_loglevel (console_printk[3]) |
124 | |
125 | struct completion; |
126 | struct pt_regs; |
127 | struct user; |
128 | |
129 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
130 | extern int _cond_resched(void); |
131 | # define might_resched() _cond_resched() |
132 | #else |
133 | # define might_resched() do { } while (0) |
134 | #endif |
135 | |
136 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
137 | void __might_sleep(const char *file, int line, int preempt_offset); |
138 | /** |
139 | * might_sleep - annotation for functions that can sleep |
140 | * |
141 | * this macro will print a stack trace if it is executed in an atomic |
142 | * context (spinlock, irq-handler, ...). |
143 | * |
144 | * This is a useful debugging help to be able to catch problems early and not |
145 | * be bitten later when the calling function happens to sleep when it is not |
146 | * supposed to. |
147 | */ |
148 | # define might_sleep() \ |
149 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
150 | #else |
151 | static inline void __might_sleep(const char *file, int line, |
152 | int preempt_offset) { } |
153 | # define might_sleep() do { might_resched(); } while (0) |
154 | #endif |
155 | |
156 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
157 | |
158 | #define abs(x) ({ \ |
159 | long __x = (x); \ |
160 | (__x < 0) ? -__x : __x; \ |
161 | }) |
162 | |
163 | #ifdef CONFIG_PROVE_LOCKING |
164 | void might_fault(void); |
165 | #else |
166 | static inline void might_fault(void) |
167 | { |
168 | might_sleep(); |
169 | } |
170 | #endif |
171 | |
172 | extern struct atomic_notifier_head panic_notifier_list; |
173 | extern long (*panic_blink)(long time); |
174 | NORET_TYPE void panic(const char * fmt, ...) |
175 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
176 | extern void oops_enter(void); |
177 | extern void oops_exit(void); |
178 | extern int oops_may_print(void); |
179 | NORET_TYPE void do_exit(long error_code) |
180 | ATTRIB_NORET; |
181 | NORET_TYPE void complete_and_exit(struct completion *, long) |
182 | ATTRIB_NORET; |
183 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
184 | extern long simple_strtol(const char *,char **,unsigned int); |
185 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
186 | extern long long simple_strtoll(const char *,char **,unsigned int); |
187 | extern int strict_strtoul(const char *, unsigned int, unsigned long *); |
188 | extern int strict_strtol(const char *, unsigned int, long *); |
189 | extern int strict_strtoull(const char *, unsigned int, unsigned long long *); |
190 | extern int strict_strtoll(const char *, unsigned int, long long *); |
191 | extern int sprintf(char * buf, const char * fmt, ...) |
192 | __attribute__ ((format (printf, 2, 3))); |
193 | extern int vsprintf(char *buf, const char *, va_list) |
194 | __attribute__ ((format (printf, 2, 0))); |
195 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
196 | __attribute__ ((format (printf, 3, 4))); |
197 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
198 | __attribute__ ((format (printf, 3, 0))); |
199 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
200 | __attribute__ ((format (printf, 3, 4))); |
201 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
202 | __attribute__ ((format (printf, 3, 0))); |
203 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
204 | __attribute__ ((format (printf, 2, 3))); |
205 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
206 | |
207 | extern int sscanf(const char *, const char *, ...) |
208 | __attribute__ ((format (scanf, 2, 3))); |
209 | extern int vsscanf(const char *, const char *, va_list) |
210 | __attribute__ ((format (scanf, 2, 0))); |
211 | |
212 | extern int get_option(char **str, int *pint); |
213 | extern char *get_options(const char *str, int nints, int *ints); |
214 | extern unsigned long long memparse(const char *ptr, char **retptr); |
215 | |
216 | extern int core_kernel_text(unsigned long addr); |
217 | extern int __kernel_text_address(unsigned long addr); |
218 | extern int kernel_text_address(unsigned long addr); |
219 | extern int func_ptr_is_kernel_text(void *ptr); |
220 | |
221 | struct pid; |
222 | extern struct pid *session_of_pgrp(struct pid *pgrp); |
223 | |
224 | /* |
225 | * FW_BUG |
226 | * Add this to a message where you are sure the firmware is buggy or behaves |
227 | * really stupid or out of spec. Be aware that the responsible BIOS developer |
228 | * should be able to fix this issue or at least get a concrete idea of the |
229 | * problem by reading your message without the need of looking at the kernel |
230 | * code. |
231 | * |
232 | * Use it for definite and high priority BIOS bugs. |
233 | * |
234 | * FW_WARN |
235 | * Use it for not that clear (e.g. could the kernel messed up things already?) |
236 | * and medium priority BIOS bugs. |
237 | * |
238 | * FW_INFO |
239 | * Use this one if you want to tell the user or vendor about something |
240 | * suspicious, but generally harmless related to the firmware. |
241 | * |
242 | * Use it for information or very low priority BIOS bugs. |
243 | */ |
244 | #define FW_BUG "[Firmware Bug]: " |
245 | #define FW_WARN "[Firmware Warn]: " |
246 | #define FW_INFO "[Firmware Info]: " |
247 | |
248 | #ifdef CONFIG_PRINTK |
249 | asmlinkage int vprintk(const char *fmt, va_list args) |
250 | __attribute__ ((format (printf, 1, 0))); |
251 | asmlinkage int printk(const char * fmt, ...) |
252 | __attribute__ ((format (printf, 1, 2))) __cold; |
253 | |
254 | extern int __printk_ratelimit(const char *func); |
255 | #define printk_ratelimit() __printk_ratelimit(__func__) |
256 | extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, |
257 | unsigned int interval_msec); |
258 | |
259 | extern int printk_delay_msec; |
260 | |
261 | /* |
262 | * Print a one-time message (analogous to WARN_ONCE() et al): |
263 | */ |
264 | #define printk_once(x...) ({ \ |
265 | static bool __print_once; \ |
266 | \ |
267 | if (!__print_once) { \ |
268 | __print_once = true; \ |
269 | printk(x); \ |
270 | } \ |
271 | }) |
272 | |
273 | void log_buf_kexec_setup(void); |
274 | #else |
275 | static inline int vprintk(const char *s, va_list args) |
276 | __attribute__ ((format (printf, 1, 0))); |
277 | static inline int vprintk(const char *s, va_list args) { return 0; } |
278 | static inline int printk(const char *s, ...) |
279 | __attribute__ ((format (printf, 1, 2))); |
280 | static inline int __cold printk(const char *s, ...) { return 0; } |
281 | static inline int printk_ratelimit(void) { return 0; } |
282 | static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ |
283 | unsigned int interval_msec) \ |
284 | { return false; } |
285 | |
286 | /* No effect, but we still get type checking even in the !PRINTK case: */ |
287 | #define printk_once(x...) printk(x) |
288 | |
289 | static inline void log_buf_kexec_setup(void) |
290 | { |
291 | } |
292 | #endif |
293 | |
294 | extern int printk_needs_cpu(int cpu); |
295 | extern void printk_tick(void); |
296 | |
297 | extern void asmlinkage __attribute__((format(printf, 1, 2))) |
298 | early_printk(const char *fmt, ...); |
299 | |
300 | unsigned long int_sqrt(unsigned long); |
301 | |
302 | static inline void console_silent(void) |
303 | { |
304 | console_loglevel = 0; |
305 | } |
306 | |
307 | static inline void console_verbose(void) |
308 | { |
309 | if (console_loglevel) |
310 | console_loglevel = 15; |
311 | } |
312 | |
313 | extern void bust_spinlocks(int yes); |
314 | extern void wake_up_klogd(void); |
315 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
316 | extern int panic_timeout; |
317 | extern int panic_on_oops; |
318 | extern int panic_on_unrecovered_nmi; |
319 | extern int panic_on_io_nmi; |
320 | extern const char *print_tainted(void); |
321 | extern void add_taint(unsigned flag); |
322 | extern int test_taint(unsigned flag); |
323 | extern unsigned long get_taint(void); |
324 | extern int root_mountflags; |
325 | |
326 | /* Values used for system_state */ |
327 | extern enum system_states { |
328 | SYSTEM_BOOTING, |
329 | SYSTEM_RUNNING, |
330 | SYSTEM_HALT, |
331 | SYSTEM_POWER_OFF, |
332 | SYSTEM_RESTART, |
333 | SYSTEM_SUSPEND_DISK, |
334 | } system_state; |
335 | |
336 | #define TAINT_PROPRIETARY_MODULE 0 |
337 | #define TAINT_FORCED_MODULE 1 |
338 | #define TAINT_UNSAFE_SMP 2 |
339 | #define TAINT_FORCED_RMMOD 3 |
340 | #define TAINT_MACHINE_CHECK 4 |
341 | #define TAINT_BAD_PAGE 5 |
342 | #define TAINT_USER 6 |
343 | #define TAINT_DIE 7 |
344 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 |
345 | #define TAINT_WARN 9 |
346 | #define TAINT_CRAP 10 |
347 | |
348 | extern void dump_stack(void) __cold; |
349 | |
350 | enum { |
351 | DUMP_PREFIX_NONE, |
352 | DUMP_PREFIX_ADDRESS, |
353 | DUMP_PREFIX_OFFSET |
354 | }; |
355 | extern void hex_dump_to_buffer(const void *buf, size_t len, |
356 | int rowsize, int groupsize, |
357 | char *linebuf, size_t linebuflen, bool ascii); |
358 | extern void print_hex_dump(const char *level, const char *prefix_str, |
359 | int prefix_type, int rowsize, int groupsize, |
360 | const void *buf, size_t len, bool ascii); |
361 | extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
362 | const void *buf, size_t len); |
363 | |
364 | extern const char hex_asc[]; |
365 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] |
366 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |
367 | |
368 | static inline char *pack_hex_byte(char *buf, u8 byte) |
369 | { |
370 | *buf++ = hex_asc_hi(byte); |
371 | *buf++ = hex_asc_lo(byte); |
372 | return buf; |
373 | } |
374 | |
375 | #ifndef pr_fmt |
376 | #define pr_fmt(fmt) fmt |
377 | #endif |
378 | |
379 | #define pr_emerg(fmt, ...) \ |
380 | printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) |
381 | #define pr_alert(fmt, ...) \ |
382 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) |
383 | #define pr_crit(fmt, ...) \ |
384 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) |
385 | #define pr_err(fmt, ...) \ |
386 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) |
387 | #define pr_warning(fmt, ...) \ |
388 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) |
389 | #define pr_notice(fmt, ...) \ |
390 | printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) |
391 | #define pr_info(fmt, ...) \ |
392 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) |
393 | #define pr_cont(fmt, ...) \ |
394 | printk(KERN_CONT fmt, ##__VA_ARGS__) |
395 | |
396 | /* pr_devel() should produce zero code unless DEBUG is defined */ |
397 | #ifdef DEBUG |
398 | #define pr_devel(fmt, ...) \ |
399 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
400 | #else |
401 | #define pr_devel(fmt, ...) \ |
402 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) |
403 | #endif |
404 | |
405 | /* If you are writing a driver, please use dev_dbg instead */ |
406 | #if defined(DEBUG) |
407 | #define pr_debug(fmt, ...) \ |
408 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
409 | #elif defined(CONFIG_DYNAMIC_DEBUG) |
410 | /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ |
411 | #define pr_debug(fmt, ...) \ |
412 | dynamic_pr_debug(fmt, ##__VA_ARGS__) |
413 | #else |
414 | #define pr_debug(fmt, ...) \ |
415 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) |
416 | #endif |
417 | |
418 | /* |
419 | * ratelimited messages with local ratelimit_state, |
420 | * no local ratelimit_state used in the !PRINTK case |
421 | */ |
422 | #ifdef CONFIG_PRINTK |
423 | #define printk_ratelimited(fmt, ...) ({ \ |
424 | static struct ratelimit_state _rs = { \ |
425 | .interval = DEFAULT_RATELIMIT_INTERVAL, \ |
426 | .burst = DEFAULT_RATELIMIT_BURST, \ |
427 | }; \ |
428 | \ |
429 | if (__ratelimit(&_rs)) \ |
430 | printk(fmt, ##__VA_ARGS__); \ |
431 | }) |
432 | #else |
433 | /* No effect, but we still get type checking even in the !PRINTK case: */ |
434 | #define printk_ratelimited printk |
435 | #endif |
436 | |
437 | #define pr_emerg_ratelimited(fmt, ...) \ |
438 | printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) |
439 | #define pr_alert_ratelimited(fmt, ...) \ |
440 | printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) |
441 | #define pr_crit_ratelimited(fmt, ...) \ |
442 | printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) |
443 | #define pr_err_ratelimited(fmt, ...) \ |
444 | printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) |
445 | #define pr_warning_ratelimited(fmt, ...) \ |
446 | printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) |
447 | #define pr_notice_ratelimited(fmt, ...) \ |
448 | printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) |
449 | #define pr_info_ratelimited(fmt, ...) \ |
450 | printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) |
451 | /* no pr_cont_ratelimited, don't do that... */ |
452 | /* If you are writing a driver, please use dev_dbg instead */ |
453 | #if defined(DEBUG) |
454 | #define pr_debug_ratelimited(fmt, ...) \ |
455 | printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
456 | #else |
457 | #define pr_debug_ratelimited(fmt, ...) \ |
458 | ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \ |
459 | ##__VA_ARGS__); 0; }) |
460 | #endif |
461 | |
462 | /* |
463 | * General tracing related utility functions - trace_printk(), |
464 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
465 | * |
466 | * Use tracing_on/tracing_off when you want to quickly turn on or off |
467 | * tracing. It simply enables or disables the recording of the trace events. |
468 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
469 | * file, which gives a means for the kernel and userspace to interact. |
470 | * Place a tracing_off() in the kernel where you want tracing to end. |
471 | * From user space, examine the trace, and then echo 1 > tracing_on |
472 | * to continue tracing. |
473 | * |
474 | * tracing_stop/tracing_start has slightly more overhead. It is used |
475 | * by things like suspend to ram where disabling the recording of the |
476 | * trace is not enough, but tracing must actually stop because things |
477 | * like calling smp_processor_id() may crash the system. |
478 | * |
479 | * Most likely, you want to use tracing_on/tracing_off. |
480 | */ |
481 | #ifdef CONFIG_RING_BUFFER |
482 | void tracing_on(void); |
483 | void tracing_off(void); |
484 | /* trace_off_permanent stops recording with no way to bring it back */ |
485 | void tracing_off_permanent(void); |
486 | int tracing_is_on(void); |
487 | #else |
488 | static inline void tracing_on(void) { } |
489 | static inline void tracing_off(void) { } |
490 | static inline void tracing_off_permanent(void) { } |
491 | static inline int tracing_is_on(void) { return 0; } |
492 | #endif |
493 | #ifdef CONFIG_TRACING |
494 | extern void tracing_start(void); |
495 | extern void tracing_stop(void); |
496 | extern void ftrace_off_permanent(void); |
497 | |
498 | extern void |
499 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); |
500 | |
501 | static inline void __attribute__ ((format (printf, 1, 2))) |
502 | ____trace_printk_check_format(const char *fmt, ...) |
503 | { |
504 | } |
505 | #define __trace_printk_check_format(fmt, args...) \ |
506 | do { \ |
507 | if (0) \ |
508 | ____trace_printk_check_format(fmt, ##args); \ |
509 | } while (0) |
510 | |
511 | /** |
512 | * trace_printk - printf formatting in the ftrace buffer |
513 | * @fmt: the printf format for printing |
514 | * |
515 | * Note: __trace_printk is an internal function for trace_printk and |
516 | * the @ip is passed in via the trace_printk macro. |
517 | * |
518 | * This function allows a kernel developer to debug fast path sections |
519 | * that printk is not appropriate for. By scattering in various |
520 | * printk like tracing in the code, a developer can quickly see |
521 | * where problems are occurring. |
522 | * |
523 | * This is intended as a debugging tool for the developer only. |
524 | * Please refrain from leaving trace_printks scattered around in |
525 | * your code. |
526 | */ |
527 | |
528 | #define trace_printk(fmt, args...) \ |
529 | do { \ |
530 | __trace_printk_check_format(fmt, ##args); \ |
531 | if (__builtin_constant_p(fmt)) { \ |
532 | static const char *trace_printk_fmt \ |
533 | __attribute__((section("__trace_printk_fmt"))) = \ |
534 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
535 | \ |
536 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
537 | } else \ |
538 | __trace_printk(_THIS_IP_, fmt, ##args); \ |
539 | } while (0) |
540 | |
541 | extern int |
542 | __trace_bprintk(unsigned long ip, const char *fmt, ...) |
543 | __attribute__ ((format (printf, 2, 3))); |
544 | |
545 | extern int |
546 | __trace_printk(unsigned long ip, const char *fmt, ...) |
547 | __attribute__ ((format (printf, 2, 3))); |
548 | |
549 | extern void trace_dump_stack(void); |
550 | |
551 | /* |
552 | * The double __builtin_constant_p is because gcc will give us an error |
553 | * if we try to allocate the static variable to fmt if it is not a |
554 | * constant. Even with the outer if statement. |
555 | */ |
556 | #define ftrace_vprintk(fmt, vargs) \ |
557 | do { \ |
558 | if (__builtin_constant_p(fmt)) { \ |
559 | static const char *trace_printk_fmt \ |
560 | __attribute__((section("__trace_printk_fmt"))) = \ |
561 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
562 | \ |
563 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
564 | } else \ |
565 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ |
566 | } while (0) |
567 | |
568 | extern int |
569 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
570 | |
571 | extern int |
572 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
573 | |
574 | extern void ftrace_dump(void); |
575 | #else |
576 | static inline void |
577 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } |
578 | static inline int |
579 | trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); |
580 | |
581 | static inline void tracing_start(void) { } |
582 | static inline void tracing_stop(void) { } |
583 | static inline void ftrace_off_permanent(void) { } |
584 | static inline void trace_dump_stack(void) { } |
585 | static inline int |
586 | trace_printk(const char *fmt, ...) |
587 | { |
588 | return 0; |
589 | } |
590 | static inline int |
591 | ftrace_vprintk(const char *fmt, va_list ap) |
592 | { |
593 | return 0; |
594 | } |
595 | static inline void ftrace_dump(void) { } |
596 | #endif /* CONFIG_TRACING */ |
597 | |
598 | /* |
599 | * Display an IP address in readable format. |
600 | */ |
601 | |
602 | #define NIPQUAD(addr) \ |
603 | ((unsigned char *)&addr)[0], \ |
604 | ((unsigned char *)&addr)[1], \ |
605 | ((unsigned char *)&addr)[2], \ |
606 | ((unsigned char *)&addr)[3] |
607 | #define NIPQUAD_FMT "%u.%u.%u.%u" |
608 | |
609 | /* |
610 | * min()/max()/clamp() macros that also do |
611 | * strict type-checking.. See the |
612 | * "unnecessary" pointer comparison. |
613 | */ |
614 | #define min(x, y) ({ \ |
615 | typeof(x) _min1 = (x); \ |
616 | typeof(y) _min2 = (y); \ |
617 | (void) (&_min1 == &_min2); \ |
618 | _min1 < _min2 ? _min1 : _min2; }) |
619 | |
620 | #define max(x, y) ({ \ |
621 | typeof(x) _max1 = (x); \ |
622 | typeof(y) _max2 = (y); \ |
623 | (void) (&_max1 == &_max2); \ |
624 | _max1 > _max2 ? _max1 : _max2; }) |
625 | |
626 | /** |
627 | * clamp - return a value clamped to a given range with strict typechecking |
628 | * @val: current value |
629 | * @min: minimum allowable value |
630 | * @max: maximum allowable value |
631 | * |
632 | * This macro does strict typechecking of min/max to make sure they are of the |
633 | * same type as val. See the unnecessary pointer comparisons. |
634 | */ |
635 | #define clamp(val, min, max) ({ \ |
636 | typeof(val) __val = (val); \ |
637 | typeof(min) __min = (min); \ |
638 | typeof(max) __max = (max); \ |
639 | (void) (&__val == &__min); \ |
640 | (void) (&__val == &__max); \ |
641 | __val = __val < __min ? __min: __val; \ |
642 | __val > __max ? __max: __val; }) |
643 | |
644 | /* |
645 | * ..and if you can't take the strict |
646 | * types, you can specify one yourself. |
647 | * |
648 | * Or not use min/max/clamp at all, of course. |
649 | */ |
650 | #define min_t(type, x, y) ({ \ |
651 | type __min1 = (x); \ |
652 | type __min2 = (y); \ |
653 | __min1 < __min2 ? __min1: __min2; }) |
654 | |
655 | #define max_t(type, x, y) ({ \ |
656 | type __max1 = (x); \ |
657 | type __max2 = (y); \ |
658 | __max1 > __max2 ? __max1: __max2; }) |
659 | |
660 | /** |
661 | * clamp_t - return a value clamped to a given range using a given type |
662 | * @type: the type of variable to use |
663 | * @val: current value |
664 | * @min: minimum allowable value |
665 | * @max: maximum allowable value |
666 | * |
667 | * This macro does no typechecking and uses temporary variables of type |
668 | * 'type' to make all the comparisons. |
669 | */ |
670 | #define clamp_t(type, val, min, max) ({ \ |
671 | type __val = (val); \ |
672 | type __min = (min); \ |
673 | type __max = (max); \ |
674 | __val = __val < __min ? __min: __val; \ |
675 | __val > __max ? __max: __val; }) |
676 | |
677 | /** |
678 | * clamp_val - return a value clamped to a given range using val's type |
679 | * @val: current value |
680 | * @min: minimum allowable value |
681 | * @max: maximum allowable value |
682 | * |
683 | * This macro does no typechecking and uses temporary variables of whatever |
684 | * type the input argument 'val' is. This is useful when val is an unsigned |
685 | * type and min and max are literals that will otherwise be assigned a signed |
686 | * integer type. |
687 | */ |
688 | #define clamp_val(val, min, max) ({ \ |
689 | typeof(val) __val = (val); \ |
690 | typeof(val) __min = (min); \ |
691 | typeof(val) __max = (max); \ |
692 | __val = __val < __min ? __min: __val; \ |
693 | __val > __max ? __max: __val; }) |
694 | |
695 | |
696 | /* |
697 | * swap - swap value of @a and @b |
698 | */ |
699 | #define swap(a, b) \ |
700 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) |
701 | |
702 | /** |
703 | * container_of - cast a member of a structure out to the containing structure |
704 | * @ptr: the pointer to the member. |
705 | * @type: the type of the container struct this is embedded in. |
706 | * @member: the name of the member within the struct. |
707 | * |
708 | */ |
709 | #define container_of(ptr, type, member) ({ \ |
710 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
711 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
712 | |
713 | struct sysinfo; |
714 | extern int do_sysinfo(struct sysinfo *info); |
715 | |
716 | #endif /* __KERNEL__ */ |
717 | |
718 | #ifndef __EXPORTED_HEADERS__ |
719 | #ifndef __KERNEL__ |
720 | #warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders |
721 | #endif /* __KERNEL__ */ |
722 | #endif /* __EXPORTED_HEADERS__ */ |
723 | |
724 | #define SI_LOAD_SHIFT 16 |
725 | struct sysinfo { |
726 | long uptime; /* Seconds since boot */ |
727 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
728 | unsigned long totalram; /* Total usable main memory size */ |
729 | unsigned long freeram; /* Available memory size */ |
730 | unsigned long sharedram; /* Amount of shared memory */ |
731 | unsigned long bufferram; /* Memory used by buffers */ |
732 | unsigned long totalswap; /* Total swap space size */ |
733 | unsigned long freeswap; /* swap space still available */ |
734 | unsigned short procs; /* Number of current processes */ |
735 | unsigned short pad; /* explicit padding for m68k */ |
736 | unsigned long totalhigh; /* Total high memory size */ |
737 | unsigned long freehigh; /* Available high memory size */ |
738 | unsigned int mem_unit; /* Memory unit size in bytes */ |
739 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
740 | }; |
741 | |
742 | /* Force a compilation error if condition is true */ |
743 | #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) |
744 | |
745 | /* Force a compilation error if condition is constant and true */ |
746 | #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) |
747 | |
748 | /* Force a compilation error if a constant expression is not a power of 2 */ |
749 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
750 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
751 | |
752 | /* Force a compilation error if condition is true, but also produce a |
753 | result (of value 0 and type size_t), so the expression can be used |
754 | e.g. in a structure initializer (or where-ever else comma expressions |
755 | aren't permitted). */ |
756 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
757 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
758 | |
759 | /* Trap pasters of __FUNCTION__ at compile-time */ |
760 | #define __FUNCTION__ (__func__) |
761 | |
762 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
763 | #ifdef CONFIG_NUMA |
764 | #define NUMA_BUILD 1 |
765 | #else |
766 | #define NUMA_BUILD 0 |
767 | #endif |
768 | |
769 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
770 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
771 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
772 | #endif |
773 | |
774 | #endif |
775 |
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