Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_KERNEL_H |
2 | #define _LINUX_KERNEL_H | |
3 | ||
1da177e4 LT |
4 | |
5 | #include <stdarg.h> | |
6 | #include <linux/linkage.h> | |
7 | #include <linux/stddef.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/compiler.h> | |
10 | #include <linux/bitops.h> | |
f0d1b0b3 | 11 | #include <linux/log2.h> |
e0deaff4 | 12 | #include <linux/typecheck.h> |
968ab183 | 13 | #include <linux/printk.h> |
e9d376f0 | 14 | #include <linux/dynamic_debug.h> |
1da177e4 | 15 | #include <asm/byteorder.h> |
607ca46e | 16 | #include <uapi/linux/kernel.h> |
1da177e4 | 17 | |
4be929be AD |
18 | #define USHRT_MAX ((u16)(~0U)) |
19 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) | |
20 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) | |
1da177e4 LT |
21 | #define INT_MAX ((int)(~0U>>1)) |
22 | #define INT_MIN (-INT_MAX - 1) | |
23 | #define UINT_MAX (~0U) | |
24 | #define LONG_MAX ((long)(~0UL>>1)) | |
25 | #define LONG_MIN (-LONG_MAX - 1) | |
26 | #define ULONG_MAX (~0UL) | |
111ebb6e OH |
27 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
28 | #define LLONG_MIN (-LLONG_MAX - 1) | |
29 | #define ULLONG_MAX (~0ULL) | |
a3860c1c | 30 | #define SIZE_MAX (~(size_t)0) |
1da177e4 LT |
31 | |
32 | #define STACK_MAGIC 0xdeadbeef | |
33 | ||
44696908 DM |
34 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
35 | ||
a79ff731 | 36 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
9f93ff5b | 37 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
a83308e6 | 38 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 39 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 40 | |
c5e631cf RR |
41 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
42 | ||
9b3be9f9 YL |
43 | /* |
44 | * This looks more complex than it should be. But we need to | |
45 | * get the type for the ~ right in round_down (it needs to be | |
46 | * as wide as the result!), and we want to evaluate the macro | |
47 | * arguments just once each. | |
48 | */ | |
49 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | |
50 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | |
51 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | |
52 | ||
4552d5dc | 53 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
930631ed | 54 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
36a26c69 NB |
55 | #define DIV_ROUND_UP_ULL(ll,d) \ |
56 | ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) | |
57 | ||
58 | #if BITS_PER_LONG == 32 | |
59 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) | |
60 | #else | |
61 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) | |
62 | #endif | |
074e61ec JM |
63 | |
64 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | |
b28efd54 EP |
65 | #define roundup(x, y) ( \ |
66 | { \ | |
6070bf35 | 67 | const typeof(y) __y = y; \ |
b28efd54 EP |
68 | (((x) + (__y - 1)) / __y) * __y; \ |
69 | } \ | |
70 | ) | |
686a0f3d EP |
71 | #define rounddown(x, y) ( \ |
72 | { \ | |
73 | typeof(x) __x = (x); \ | |
74 | __x - (__x % (y)); \ | |
75 | } \ | |
76 | ) | |
b6d86d3d GR |
77 | |
78 | /* | |
79 | * Divide positive or negative dividend by positive divisor and round | |
c4e18497 GR |
80 | * to closest integer. Result is undefined for negative divisors and |
81 | * for negative dividends if the divisor variable type is unsigned. | |
b6d86d3d | 82 | */ |
9fe06081 DW |
83 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
84 | { \ | |
b6d86d3d GR |
85 | typeof(x) __x = x; \ |
86 | typeof(divisor) __d = divisor; \ | |
c4e18497 GR |
87 | (((typeof(x))-1) > 0 || \ |
88 | ((typeof(divisor))-1) > 0 || (__x) > 0) ? \ | |
b6d86d3d GR |
89 | (((__x) + ((__d) / 2)) / (__d)) : \ |
90 | (((__x) - ((__d) / 2)) / (__d)); \ | |
9fe06081 DW |
91 | } \ |
92 | ) | |
1da177e4 | 93 | |
9993bc63 SQ |
94 | /* |
95 | * Multiplies an integer by a fraction, while avoiding unnecessary | |
96 | * overflow or loss of precision. | |
97 | */ | |
98 | #define mult_frac(x, numer, denom)( \ | |
99 | { \ | |
100 | typeof(x) quot = (x) / (denom); \ | |
101 | typeof(x) rem = (x) % (denom); \ | |
102 | (quot * (numer)) + ((rem * (numer)) / (denom)); \ | |
103 | } \ | |
104 | ) | |
105 | ||
106 | ||
ca31e146 EGM |
107 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
108 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
109 | ||
90c699a9 | 110 | #ifdef CONFIG_LBDAF |
2da96acd JA |
111 | # include <asm/div64.h> |
112 | # define sector_div(a, b) do_div(a, b) | |
113 | #else | |
114 | # define sector_div(n, b)( \ | |
115 | { \ | |
116 | int _res; \ | |
117 | _res = (n) % (b); \ | |
118 | (n) /= (b); \ | |
119 | _res; \ | |
120 | } \ | |
121 | ) | |
122 | #endif | |
123 | ||
218e180e AM |
124 | /** |
125 | * upper_32_bits - return bits 32-63 of a number | |
126 | * @n: the number we're accessing | |
127 | * | |
128 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
129 | * the "right shift count >= width of type" warning when that quantity is | |
130 | * 32-bits. | |
131 | */ | |
132 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
133 | ||
204b885e JR |
134 | /** |
135 | * lower_32_bits - return bits 0-31 of a number | |
136 | * @n: the number we're accessing | |
137 | */ | |
138 | #define lower_32_bits(n) ((u32)(n)) | |
139 | ||
1da177e4 | 140 | struct completion; |
df2e71fb | 141 | struct pt_regs; |
142 | struct user; | |
1da177e4 | 143 | |
070cb065 UKK |
144 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
145 | extern int _cond_resched(void); | |
146 | # define might_resched() _cond_resched() | |
147 | #else | |
148 | # define might_resched() do { } while (0) | |
149 | #endif | |
150 | ||
d902db1e | 151 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
d894837f | 152 | void __might_sleep(const char *file, int line, int preempt_offset); |
1da177e4 LT |
153 | /** |
154 | * might_sleep - annotation for functions that can sleep | |
155 | * | |
156 | * this macro will print a stack trace if it is executed in an atomic | |
157 | * context (spinlock, irq-handler, ...). | |
158 | * | |
159 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 160 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
161 | * supposed to. |
162 | */ | |
f8cbd99b | 163 | # define might_sleep() \ |
e4aafea2 | 164 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
1da177e4 | 165 | #else |
d894837f SK |
166 | static inline void __might_sleep(const char *file, int line, |
167 | int preempt_offset) { } | |
f8cbd99b | 168 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
169 | #endif |
170 | ||
368a5fa1 | 171 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 172 | |
71a90484 AM |
173 | /* |
174 | * abs() handles unsigned and signed longs, ints, shorts and chars. For all | |
175 | * input types abs() returns a signed long. | |
176 | * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() | |
177 | * for those. | |
178 | */ | |
179 | #define abs(x) ({ \ | |
180 | long ret; \ | |
181 | if (sizeof(x) == sizeof(long)) { \ | |
182 | long __x = (x); \ | |
183 | ret = (__x < 0) ? -__x : __x; \ | |
184 | } else { \ | |
185 | int __x = (x); \ | |
186 | ret = (__x < 0) ? -__x : __x; \ | |
187 | } \ | |
188 | ret; \ | |
1da177e4 LT |
189 | }) |
190 | ||
658716d1 BB |
191 | #define abs64(x) ({ \ |
192 | s64 __x = (x); \ | |
193 | (__x < 0) ? -__x : __x; \ | |
194 | }) | |
195 | ||
3ee1afa3 NP |
196 | #ifdef CONFIG_PROVE_LOCKING |
197 | void might_fault(void); | |
198 | #else | |
199 | static inline void might_fault(void) | |
200 | { | |
201 | might_sleep(); | |
202 | } | |
203 | #endif | |
204 | ||
e041c683 | 205 | extern struct atomic_notifier_head panic_notifier_list; |
c7ff0d9c | 206 | extern long (*panic_blink)(int state); |
9402c95f | 207 | __printf(1, 2) |
4da47859 | 208 | void panic(const char *fmt, ...) |
ff2d8b19 | 209 | __noreturn __cold; |
dd287796 AM |
210 | extern void oops_enter(void); |
211 | extern void oops_exit(void); | |
863a6049 | 212 | void print_oops_end_marker(void); |
dd287796 | 213 | extern int oops_may_print(void); |
9402c95f | 214 | void do_exit(long error_code) |
ff2d8b19 | 215 | __noreturn; |
9402c95f | 216 | void complete_and_exit(struct completion *, long) |
ff2d8b19 | 217 | __noreturn; |
33ee3b2e AD |
218 | |
219 | /* Internal, do not use. */ | |
220 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); | |
221 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); | |
222 | ||
223 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); | |
224 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); | |
4c925d60 EZ |
225 | |
226 | /** | |
227 | * kstrtoul - convert a string to an unsigned long | |
228 | * @s: The start of the string. The string must be null-terminated, and may also | |
229 | * include a single newline before its terminating null. The first character | |
230 | * may also be a plus sign, but not a minus sign. | |
231 | * @base: The number base to use. The maximum supported base is 16. If base is | |
232 | * given as 0, then the base of the string is automatically detected with the | |
233 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
234 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
235 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
236 | * @res: Where to write the result of the conversion on success. | |
237 | * | |
238 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
239 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
240 | * be checked. | |
241 | */ | |
33ee3b2e AD |
242 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) |
243 | { | |
244 | /* | |
245 | * We want to shortcut function call, but | |
246 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. | |
247 | */ | |
248 | if (sizeof(unsigned long) == sizeof(unsigned long long) && | |
249 | __alignof__(unsigned long) == __alignof__(unsigned long long)) | |
250 | return kstrtoull(s, base, (unsigned long long *)res); | |
251 | else | |
252 | return _kstrtoul(s, base, res); | |
253 | } | |
254 | ||
4c925d60 EZ |
255 | /** |
256 | * kstrtol - convert a string to a long | |
257 | * @s: The start of the string. The string must be null-terminated, and may also | |
258 | * include a single newline before its terminating null. The first character | |
259 | * may also be a plus sign or a minus sign. | |
260 | * @base: The number base to use. The maximum supported base is 16. If base is | |
261 | * given as 0, then the base of the string is automatically detected with the | |
262 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
263 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
264 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
265 | * @res: Where to write the result of the conversion on success. | |
266 | * | |
267 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
268 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
269 | * be checked. | |
270 | */ | |
33ee3b2e AD |
271 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) |
272 | { | |
273 | /* | |
274 | * We want to shortcut function call, but | |
275 | * __builtin_types_compatible_p(long, long long) = 0. | |
276 | */ | |
277 | if (sizeof(long) == sizeof(long long) && | |
278 | __alignof__(long) == __alignof__(long long)) | |
279 | return kstrtoll(s, base, (long long *)res); | |
280 | else | |
281 | return _kstrtol(s, base, res); | |
282 | } | |
283 | ||
284 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); | |
285 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); | |
286 | ||
287 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) | |
288 | { | |
289 | return kstrtoull(s, base, res); | |
290 | } | |
291 | ||
292 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) | |
293 | { | |
294 | return kstrtoll(s, base, res); | |
295 | } | |
296 | ||
297 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) | |
298 | { | |
299 | return kstrtouint(s, base, res); | |
300 | } | |
301 | ||
302 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) | |
303 | { | |
304 | return kstrtoint(s, base, res); | |
305 | } | |
306 | ||
307 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); | |
308 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); | |
309 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); | |
310 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); | |
311 | ||
c196e32a AD |
312 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); |
313 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); | |
314 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); | |
315 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); | |
316 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); | |
317 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); | |
318 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); | |
319 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); | |
320 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); | |
321 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); | |
322 | ||
323 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) | |
324 | { | |
325 | return kstrtoull_from_user(s, count, base, res); | |
326 | } | |
327 | ||
328 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) | |
329 | { | |
330 | return kstrtoll_from_user(s, count, base, res); | |
331 | } | |
332 | ||
333 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) | |
334 | { | |
335 | return kstrtouint_from_user(s, count, base, res); | |
336 | } | |
337 | ||
338 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) | |
339 | { | |
340 | return kstrtoint_from_user(s, count, base, res); | |
341 | } | |
342 | ||
67d0a075 JP |
343 | /* Obsolete, do not use. Use kstrto<foo> instead */ |
344 | ||
1da177e4 LT |
345 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
346 | extern long simple_strtol(const char *,char **,unsigned int); | |
347 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
348 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
33ee3b2e AD |
349 | #define strict_strtoul kstrtoul |
350 | #define strict_strtol kstrtol | |
351 | #define strict_strtoull kstrtoull | |
352 | #define strict_strtoll kstrtoll | |
353 | ||
1ac101a5 KH |
354 | extern int num_to_str(char *buf, int size, unsigned long long num); |
355 | ||
67d0a075 JP |
356 | /* lib/printf utilities */ |
357 | ||
b9075fa9 JP |
358 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
359 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | |
360 | extern __printf(3, 4) | |
361 | int snprintf(char *buf, size_t size, const char *fmt, ...); | |
362 | extern __printf(3, 0) | |
363 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
364 | extern __printf(3, 4) | |
365 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | |
366 | extern __printf(3, 0) | |
367 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
368 | extern __printf(2, 3) | |
369 | char *kasprintf(gfp_t gfp, const char *fmt, ...); | |
11443ec7 | 370 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
1da177e4 | 371 | |
6061d949 JP |
372 | extern __scanf(2, 3) |
373 | int sscanf(const char *, const char *, ...); | |
374 | extern __scanf(2, 0) | |
375 | int vsscanf(const char *, const char *, va_list); | |
1da177e4 LT |
376 | |
377 | extern int get_option(char **str, int *pint); | |
378 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 379 | extern unsigned long long memparse(const char *ptr, char **retptr); |
1da177e4 | 380 | |
5e376613 | 381 | extern int core_kernel_text(unsigned long addr); |
cdbe61bf | 382 | extern int core_kernel_data(unsigned long addr); |
1da177e4 LT |
383 | extern int __kernel_text_address(unsigned long addr); |
384 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 385 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 386 | |
04a2e6a5 EB |
387 | struct pid; |
388 | extern struct pid *session_of_pgrp(struct pid *pgrp); | |
1da177e4 | 389 | |
1da177e4 LT |
390 | unsigned long int_sqrt(unsigned long); |
391 | ||
1da177e4 LT |
392 | extern void bust_spinlocks(int yes); |
393 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ | |
aa727107 | 394 | extern int panic_timeout; |
1da177e4 | 395 | extern int panic_on_oops; |
8da5adda | 396 | extern int panic_on_unrecovered_nmi; |
5211a242 | 397 | extern int panic_on_io_nmi; |
55af7796 | 398 | extern int sysctl_panic_on_stackoverflow; |
1da177e4 | 399 | extern const char *print_tainted(void); |
373d4d09 RR |
400 | enum lockdep_ok { |
401 | LOCKDEP_STILL_OK, | |
402 | LOCKDEP_NOW_UNRELIABLE | |
403 | }; | |
404 | extern void add_taint(unsigned flag, enum lockdep_ok); | |
25ddbb18 AK |
405 | extern int test_taint(unsigned flag); |
406 | extern unsigned long get_taint(void); | |
b920de1b | 407 | extern int root_mountflags; |
1da177e4 | 408 | |
2ce802f6 TH |
409 | extern bool early_boot_irqs_disabled; |
410 | ||
1da177e4 LT |
411 | /* Values used for system_state */ |
412 | extern enum system_states { | |
413 | SYSTEM_BOOTING, | |
414 | SYSTEM_RUNNING, | |
415 | SYSTEM_HALT, | |
416 | SYSTEM_POWER_OFF, | |
417 | SYSTEM_RESTART, | |
418 | } system_state; | |
419 | ||
25ddbb18 AK |
420 | #define TAINT_PROPRIETARY_MODULE 0 |
421 | #define TAINT_FORCED_MODULE 1 | |
422 | #define TAINT_UNSAFE_SMP 2 | |
423 | #define TAINT_FORCED_RMMOD 3 | |
424 | #define TAINT_MACHINE_CHECK 4 | |
425 | #define TAINT_BAD_PAGE 5 | |
426 | #define TAINT_USER 6 | |
427 | #define TAINT_DIE 7 | |
428 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
429 | #define TAINT_WARN 9 | |
26e9a397 | 430 | #define TAINT_CRAP 10 |
92946bc7 | 431 | #define TAINT_FIRMWARE_WORKAROUND 11 |
2449b8ba | 432 | #define TAINT_OOT_MODULE 12 |
1da177e4 | 433 | |
3fc95772 HH |
434 | extern const char hex_asc[]; |
435 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
436 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
437 | ||
55036ba7 | 438 | static inline char *hex_byte_pack(char *buf, u8 byte) |
3fc95772 HH |
439 | { |
440 | *buf++ = hex_asc_hi(byte); | |
441 | *buf++ = hex_asc_lo(byte); | |
442 | return buf; | |
443 | } | |
99eaf3c4 | 444 | |
55036ba7 AS |
445 | static inline char * __deprecated pack_hex_byte(char *buf, u8 byte) |
446 | { | |
447 | return hex_byte_pack(buf, byte); | |
448 | } | |
449 | ||
90378889 | 450 | extern int hex_to_bin(char ch); |
b7804983 | 451 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
90378889 | 452 | |
526211bc IM |
453 | /* |
454 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
455 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
456 | * | |
457 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
458 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 459 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
460 | * file, which gives a means for the kernel and userspace to interact. |
461 | * Place a tracing_off() in the kernel where you want tracing to end. | |
462 | * From user space, examine the trace, and then echo 1 > tracing_on | |
463 | * to continue tracing. | |
464 | * | |
465 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
466 | * by things like suspend to ram where disabling the recording of the | |
467 | * trace is not enough, but tracing must actually stop because things | |
468 | * like calling smp_processor_id() may crash the system. | |
469 | * | |
470 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 471 | */ |
2002c258 | 472 | #ifdef CONFIG_RING_BUFFER |
2002c258 SR |
473 | /* trace_off_permanent stops recording with no way to bring it back */ |
474 | void tracing_off_permanent(void); | |
2002c258 | 475 | #else |
2002c258 | 476 | static inline void tracing_off_permanent(void) { } |
2002c258 | 477 | #endif |
cecbca96 FW |
478 | |
479 | enum ftrace_dump_mode { | |
480 | DUMP_NONE, | |
481 | DUMP_ALL, | |
482 | DUMP_ORIG, | |
483 | }; | |
484 | ||
526211bc | 485 | #ifdef CONFIG_TRACING |
93d68e52 SR |
486 | void tracing_on(void); |
487 | void tracing_off(void); | |
488 | int tracing_is_on(void); | |
ad909e21 SRRH |
489 | void tracing_snapshot(void); |
490 | void tracing_snapshot_alloc(void); | |
93d68e52 | 491 | |
526211bc IM |
492 | extern void tracing_start(void); |
493 | extern void tracing_stop(void); | |
494 | extern void ftrace_off_permanent(void); | |
495 | ||
b9075fa9 JP |
496 | static inline __printf(1, 2) |
497 | void ____trace_printk_check_format(const char *fmt, ...) | |
769b0441 FW |
498 | { |
499 | } | |
500 | #define __trace_printk_check_format(fmt, args...) \ | |
501 | do { \ | |
502 | if (0) \ | |
503 | ____trace_printk_check_format(fmt, ##args); \ | |
504 | } while (0) | |
505 | ||
526211bc IM |
506 | /** |
507 | * trace_printk - printf formatting in the ftrace buffer | |
508 | * @fmt: the printf format for printing | |
509 | * | |
510 | * Note: __trace_printk is an internal function for trace_printk and | |
511 | * the @ip is passed in via the trace_printk macro. | |
512 | * | |
513 | * This function allows a kernel developer to debug fast path sections | |
514 | * that printk is not appropriate for. By scattering in various | |
515 | * printk like tracing in the code, a developer can quickly see | |
516 | * where problems are occurring. | |
517 | * | |
518 | * This is intended as a debugging tool for the developer only. | |
519 | * Please refrain from leaving trace_printks scattered around in | |
09ae7234 SRRH |
520 | * your code. (Extra memory is used for special buffers that are |
521 | * allocated when trace_printk() is used) | |
9d3c752c SRRH |
522 | * |
523 | * A little optization trick is done here. If there's only one | |
524 | * argument, there's no need to scan the string for printf formats. | |
525 | * The trace_puts() will suffice. But how can we take advantage of | |
526 | * using trace_puts() when trace_printk() has only one argument? | |
527 | * By stringifying the args and checking the size we can tell | |
528 | * whether or not there are args. __stringify((__VA_ARGS__)) will | |
529 | * turn into "()\0" with a size of 3 when there are no args, anything | |
530 | * else will be bigger. All we need to do is define a string to this, | |
531 | * and then take its size and compare to 3. If it's bigger, use | |
532 | * do_trace_printk() otherwise, optimize it to trace_puts(). Then just | |
533 | * let gcc optimize the rest. | |
526211bc | 534 | */ |
769b0441 | 535 | |
9d3c752c SRRH |
536 | #define trace_printk(fmt, ...) \ |
537 | do { \ | |
538 | char _______STR[] = __stringify((__VA_ARGS__)); \ | |
539 | if (sizeof(_______STR) > 3) \ | |
540 | do_trace_printk(fmt, ##__VA_ARGS__); \ | |
541 | else \ | |
542 | trace_puts(fmt); \ | |
543 | } while (0) | |
544 | ||
545 | #define do_trace_printk(fmt, args...) \ | |
769b0441 | 546 | do { \ |
07d777fe SR |
547 | static const char *trace_printk_fmt \ |
548 | __attribute__((section("__trace_printk_fmt"))) = \ | |
549 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
550 | \ | |
769b0441 | 551 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 | 552 | \ |
07d777fe | 553 | if (__builtin_constant_p(fmt)) \ |
48ead020 | 554 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
07d777fe SR |
555 | else \ |
556 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
557 | } while (0) |
558 | ||
b9075fa9 JP |
559 | extern __printf(2, 3) |
560 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | |
48ead020 | 561 | |
b9075fa9 JP |
562 | extern __printf(2, 3) |
563 | int __trace_printk(unsigned long ip, const char *fmt, ...); | |
769b0441 | 564 | |
09ae7234 SRRH |
565 | /** |
566 | * trace_puts - write a string into the ftrace buffer | |
567 | * @str: the string to record | |
568 | * | |
569 | * Note: __trace_bputs is an internal function for trace_puts and | |
570 | * the @ip is passed in via the trace_puts macro. | |
571 | * | |
572 | * This is similar to trace_printk() but is made for those really fast | |
573 | * paths that a developer wants the least amount of "Heisenbug" affects, | |
574 | * where the processing of the print format is still too much. | |
575 | * | |
576 | * This function allows a kernel developer to debug fast path sections | |
577 | * that printk is not appropriate for. By scattering in various | |
578 | * printk like tracing in the code, a developer can quickly see | |
579 | * where problems are occurring. | |
580 | * | |
581 | * This is intended as a debugging tool for the developer only. | |
582 | * Please refrain from leaving trace_puts scattered around in | |
583 | * your code. (Extra memory is used for special buffers that are | |
584 | * allocated when trace_puts() is used) | |
585 | * | |
586 | * Returns: 0 if nothing was written, positive # if string was. | |
587 | * (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) | |
588 | */ | |
589 | ||
590 | extern int __trace_bputs(unsigned long ip, const char *str); | |
591 | extern int __trace_puts(unsigned long ip, const char *str, int size); | |
592 | #define trace_puts(str) ({ \ | |
593 | static const char *trace_printk_fmt \ | |
594 | __attribute__((section("__trace_printk_fmt"))) = \ | |
595 | __builtin_constant_p(str) ? str : NULL; \ | |
596 | \ | |
597 | if (__builtin_constant_p(str)) \ | |
598 | __trace_bputs(_THIS_IP_, trace_printk_fmt); \ | |
599 | else \ | |
600 | __trace_puts(_THIS_IP_, str, strlen(str)); \ | |
601 | }) | |
602 | ||
c142be8e | 603 | extern void trace_dump_stack(int skip); |
03889384 | 604 | |
48ead020 FW |
605 | /* |
606 | * The double __builtin_constant_p is because gcc will give us an error | |
607 | * if we try to allocate the static variable to fmt if it is not a | |
608 | * constant. Even with the outer if statement. | |
609 | */ | |
769b0441 FW |
610 | #define ftrace_vprintk(fmt, vargs) \ |
611 | do { \ | |
48ead020 FW |
612 | if (__builtin_constant_p(fmt)) { \ |
613 | static const char *trace_printk_fmt \ | |
614 | __attribute__((section("__trace_printk_fmt"))) = \ | |
615 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 616 | \ |
48ead020 FW |
617 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
618 | } else \ | |
619 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
620 | } while (0) |
621 | ||
48ead020 FW |
622 | extern int |
623 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); | |
624 | ||
526211bc IM |
625 | extern int |
626 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); | |
769b0441 | 627 | |
cecbca96 | 628 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 629 | #else |
526211bc IM |
630 | static inline void tracing_start(void) { } |
631 | static inline void tracing_stop(void) { } | |
632 | static inline void ftrace_off_permanent(void) { } | |
e36c5458 | 633 | static inline void trace_dump_stack(void) { } |
93d68e52 SR |
634 | |
635 | static inline void tracing_on(void) { } | |
636 | static inline void tracing_off(void) { } | |
637 | static inline int tracing_is_on(void) { return 0; } | |
ad909e21 SRRH |
638 | static inline void tracing_snapshot(void) { } |
639 | static inline void tracing_snapshot_alloc(void) { } | |
93d68e52 | 640 | |
60efc15a MH |
641 | static inline __printf(1, 2) |
642 | int trace_printk(const char *fmt, ...) | |
526211bc IM |
643 | { |
644 | return 0; | |
645 | } | |
646 | static inline int | |
647 | ftrace_vprintk(const char *fmt, va_list ap) | |
648 | { | |
649 | return 0; | |
650 | } | |
cecbca96 | 651 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 652 | #endif /* CONFIG_TRACING */ |
526211bc | 653 | |
1da177e4 | 654 | /* |
bdf4bbaa | 655 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
656 | * strict type-checking.. See the |
657 | * "unnecessary" pointer comparison. | |
658 | */ | |
bdf4bbaa HH |
659 | #define min(x, y) ({ \ |
660 | typeof(x) _min1 = (x); \ | |
661 | typeof(y) _min2 = (y); \ | |
662 | (void) (&_min1 == &_min2); \ | |
663 | _min1 < _min2 ? _min1 : _min2; }) | |
664 | ||
665 | #define max(x, y) ({ \ | |
666 | typeof(x) _max1 = (x); \ | |
667 | typeof(y) _max2 = (y); \ | |
668 | (void) (&_max1 == &_max2); \ | |
669 | _max1 > _max2 ? _max1 : _max2; }) | |
670 | ||
f27c85c5 HPP |
671 | #define min3(x, y, z) ({ \ |
672 | typeof(x) _min1 = (x); \ | |
673 | typeof(y) _min2 = (y); \ | |
674 | typeof(z) _min3 = (z); \ | |
675 | (void) (&_min1 == &_min2); \ | |
676 | (void) (&_min1 == &_min3); \ | |
677 | _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ | |
678 | (_min2 < _min3 ? _min2 : _min3); }) | |
679 | ||
680 | #define max3(x, y, z) ({ \ | |
681 | typeof(x) _max1 = (x); \ | |
682 | typeof(y) _max2 = (y); \ | |
683 | typeof(z) _max3 = (z); \ | |
684 | (void) (&_max1 == &_max2); \ | |
685 | (void) (&_max1 == &_max3); \ | |
686 | _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ | |
687 | (_max2 > _max3 ? _max2 : _max3); }) | |
688 | ||
c8bf1336 MP |
689 | /** |
690 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero | |
691 | * @x: value1 | |
692 | * @y: value2 | |
693 | */ | |
694 | #define min_not_zero(x, y) ({ \ | |
695 | typeof(x) __x = (x); \ | |
696 | typeof(y) __y = (y); \ | |
697 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | |
698 | ||
bdf4bbaa HH |
699 | /** |
700 | * clamp - return a value clamped to a given range with strict typechecking | |
701 | * @val: current value | |
702 | * @min: minimum allowable value | |
703 | * @max: maximum allowable value | |
704 | * | |
705 | * This macro does strict typechecking of min/max to make sure they are of the | |
706 | * same type as val. See the unnecessary pointer comparisons. | |
707 | */ | |
708 | #define clamp(val, min, max) ({ \ | |
709 | typeof(val) __val = (val); \ | |
710 | typeof(min) __min = (min); \ | |
711 | typeof(max) __max = (max); \ | |
712 | (void) (&__val == &__min); \ | |
713 | (void) (&__val == &__max); \ | |
714 | __val = __val < __min ? __min: __val; \ | |
715 | __val > __max ? __max: __val; }) | |
1da177e4 LT |
716 | |
717 | /* | |
718 | * ..and if you can't take the strict | |
719 | * types, you can specify one yourself. | |
720 | * | |
bdf4bbaa HH |
721 | * Or not use min/max/clamp at all, of course. |
722 | */ | |
723 | #define min_t(type, x, y) ({ \ | |
724 | type __min1 = (x); \ | |
725 | type __min2 = (y); \ | |
726 | __min1 < __min2 ? __min1: __min2; }) | |
727 | ||
728 | #define max_t(type, x, y) ({ \ | |
729 | type __max1 = (x); \ | |
730 | type __max2 = (y); \ | |
731 | __max1 > __max2 ? __max1: __max2; }) | |
732 | ||
733 | /** | |
734 | * clamp_t - return a value clamped to a given range using a given type | |
735 | * @type: the type of variable to use | |
736 | * @val: current value | |
737 | * @min: minimum allowable value | |
738 | * @max: maximum allowable value | |
739 | * | |
740 | * This macro does no typechecking and uses temporary variables of type | |
741 | * 'type' to make all the comparisons. | |
1da177e4 | 742 | */ |
bdf4bbaa HH |
743 | #define clamp_t(type, val, min, max) ({ \ |
744 | type __val = (val); \ | |
745 | type __min = (min); \ | |
746 | type __max = (max); \ | |
747 | __val = __val < __min ? __min: __val; \ | |
748 | __val > __max ? __max: __val; }) | |
1da177e4 | 749 | |
bdf4bbaa HH |
750 | /** |
751 | * clamp_val - return a value clamped to a given range using val's type | |
752 | * @val: current value | |
753 | * @min: minimum allowable value | |
754 | * @max: maximum allowable value | |
755 | * | |
756 | * This macro does no typechecking and uses temporary variables of whatever | |
757 | * type the input argument 'val' is. This is useful when val is an unsigned | |
758 | * type and min and max are literals that will otherwise be assigned a signed | |
759 | * integer type. | |
760 | */ | |
761 | #define clamp_val(val, min, max) ({ \ | |
762 | typeof(val) __val = (val); \ | |
763 | typeof(val) __min = (min); \ | |
764 | typeof(val) __max = (max); \ | |
765 | __val = __val < __min ? __min: __val; \ | |
766 | __val > __max ? __max: __val; }) | |
1da177e4 | 767 | |
91f68b73 WF |
768 | |
769 | /* | |
770 | * swap - swap value of @a and @b | |
771 | */ | |
ac7b9004 PZ |
772 | #define swap(a, b) \ |
773 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 774 | |
1da177e4 LT |
775 | /** |
776 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
777 | * @ptr: the pointer to the member. |
778 | * @type: the type of the container struct this is embedded in. | |
779 | * @member: the name of the member within the struct. | |
780 | * | |
781 | */ | |
782 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
783 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
784 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 | 785 | |
b9d4f426 AL |
786 | /* Trap pasters of __FUNCTION__ at compile-time */ |
787 | #define __FUNCTION__ (__func__) | |
788 | ||
cbdbf2ab JH |
789 | /* This helps us to avoid #ifdef CONFIG_SYMBOL_PREFIX */ |
790 | #ifdef CONFIG_SYMBOL_PREFIX | |
791 | #define SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX | |
792 | #else | |
793 | #define SYMBOL_PREFIX "" | |
794 | #endif | |
795 | ||
b9d4f426 AL |
796 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
797 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
798 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
799 | #endif | |
9d00f92f | 800 | |
1da177e4 | 801 | #endif |