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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> |
1da177e4 | 14 | #include <asm/byteorder.h> |
607ca46e | 15 | #include <uapi/linux/kernel.h> |
1da177e4 | 16 | |
4be929be AD |
17 | #define USHRT_MAX ((u16)(~0U)) |
18 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) | |
19 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) | |
1da177e4 LT |
20 | #define INT_MAX ((int)(~0U>>1)) |
21 | #define INT_MIN (-INT_MAX - 1) | |
22 | #define UINT_MAX (~0U) | |
23 | #define LONG_MAX ((long)(~0UL>>1)) | |
24 | #define LONG_MIN (-LONG_MAX - 1) | |
25 | #define ULONG_MAX (~0UL) | |
111ebb6e OH |
26 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
27 | #define LLONG_MIN (-LLONG_MAX - 1) | |
28 | #define ULLONG_MAX (~0ULL) | |
a3860c1c | 29 | #define SIZE_MAX (~(size_t)0) |
1da177e4 | 30 | |
89a07141 AE |
31 | #define U8_MAX ((u8)~0U) |
32 | #define S8_MAX ((s8)(U8_MAX>>1)) | |
33 | #define S8_MIN ((s8)(-S8_MAX - 1)) | |
34 | #define U16_MAX ((u16)~0U) | |
35 | #define S16_MAX ((s16)(U16_MAX>>1)) | |
36 | #define S16_MIN ((s16)(-S16_MAX - 1)) | |
37 | #define U32_MAX ((u32)~0U) | |
38 | #define S32_MAX ((s32)(U32_MAX>>1)) | |
39 | #define S32_MIN ((s32)(-S32_MAX - 1)) | |
40 | #define U64_MAX ((u64)~0ULL) | |
41 | #define S64_MAX ((s64)(U64_MAX>>1)) | |
42 | #define S64_MIN ((s64)(-S64_MAX - 1)) | |
43 | ||
1da177e4 LT |
44 | #define STACK_MAGIC 0xdeadbeef |
45 | ||
44696908 DM |
46 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
47 | ||
a79ff731 | 48 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
9f93ff5b | 49 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
a83308e6 | 50 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 51 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 52 | |
c5e631cf RR |
53 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
54 | ||
3ed605bc GP |
55 | #define u64_to_user_ptr(x) ( \ |
56 | { \ | |
57 | typecheck(u64, x); \ | |
58 | (void __user *)(uintptr_t)x; \ | |
59 | } \ | |
60 | ) | |
61 | ||
9b3be9f9 YL |
62 | /* |
63 | * This looks more complex than it should be. But we need to | |
64 | * get the type for the ~ right in round_down (it needs to be | |
65 | * as wide as the result!), and we want to evaluate the macro | |
66 | * arguments just once each. | |
67 | */ | |
68 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | |
69 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | |
70 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | |
71 | ||
4552d5dc | 72 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
b5d3755a | 73 | #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP |
36a26c69 NB |
74 | #define DIV_ROUND_UP_ULL(ll,d) \ |
75 | ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) | |
76 | ||
77 | #if BITS_PER_LONG == 32 | |
78 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) | |
79 | #else | |
80 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) | |
81 | #endif | |
074e61ec JM |
82 | |
83 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | |
b28efd54 EP |
84 | #define roundup(x, y) ( \ |
85 | { \ | |
6070bf35 | 86 | const typeof(y) __y = y; \ |
b28efd54 EP |
87 | (((x) + (__y - 1)) / __y) * __y; \ |
88 | } \ | |
89 | ) | |
686a0f3d EP |
90 | #define rounddown(x, y) ( \ |
91 | { \ | |
92 | typeof(x) __x = (x); \ | |
93 | __x - (__x % (y)); \ | |
94 | } \ | |
95 | ) | |
b6d86d3d GR |
96 | |
97 | /* | |
98 | * Divide positive or negative dividend by positive divisor and round | |
c4e18497 GR |
99 | * to closest integer. Result is undefined for negative divisors and |
100 | * for negative dividends if the divisor variable type is unsigned. | |
b6d86d3d | 101 | */ |
9fe06081 DW |
102 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
103 | { \ | |
b6d86d3d GR |
104 | typeof(x) __x = x; \ |
105 | typeof(divisor) __d = divisor; \ | |
c4e18497 GR |
106 | (((typeof(x))-1) > 0 || \ |
107 | ((typeof(divisor))-1) > 0 || (__x) > 0) ? \ | |
b6d86d3d GR |
108 | (((__x) + ((__d) / 2)) / (__d)) : \ |
109 | (((__x) - ((__d) / 2)) / (__d)); \ | |
9fe06081 DW |
110 | } \ |
111 | ) | |
f766093e JM |
112 | /* |
113 | * Same as above but for u64 dividends. divisor must be a 32-bit | |
114 | * number. | |
115 | */ | |
116 | #define DIV_ROUND_CLOSEST_ULL(x, divisor)( \ | |
117 | { \ | |
118 | typeof(divisor) __d = divisor; \ | |
119 | unsigned long long _tmp = (x) + (__d) / 2; \ | |
120 | do_div(_tmp, __d); \ | |
121 | _tmp; \ | |
122 | } \ | |
123 | ) | |
1da177e4 | 124 | |
9993bc63 SQ |
125 | /* |
126 | * Multiplies an integer by a fraction, while avoiding unnecessary | |
127 | * overflow or loss of precision. | |
128 | */ | |
129 | #define mult_frac(x, numer, denom)( \ | |
130 | { \ | |
131 | typeof(x) quot = (x) / (denom); \ | |
132 | typeof(x) rem = (x) % (denom); \ | |
133 | (quot * (numer)) + ((rem * (numer)) / (denom)); \ | |
134 | } \ | |
135 | ) | |
136 | ||
137 | ||
ca31e146 EGM |
138 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
139 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
140 | ||
90c699a9 | 141 | #ifdef CONFIG_LBDAF |
2da96acd JA |
142 | # include <asm/div64.h> |
143 | # define sector_div(a, b) do_div(a, b) | |
144 | #else | |
145 | # define sector_div(n, b)( \ | |
146 | { \ | |
147 | int _res; \ | |
148 | _res = (n) % (b); \ | |
149 | (n) /= (b); \ | |
150 | _res; \ | |
151 | } \ | |
152 | ) | |
153 | #endif | |
154 | ||
218e180e AM |
155 | /** |
156 | * upper_32_bits - return bits 32-63 of a number | |
157 | * @n: the number we're accessing | |
158 | * | |
159 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
160 | * the "right shift count >= width of type" warning when that quantity is | |
161 | * 32-bits. | |
162 | */ | |
163 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
164 | ||
204b885e JR |
165 | /** |
166 | * lower_32_bits - return bits 0-31 of a number | |
167 | * @n: the number we're accessing | |
168 | */ | |
169 | #define lower_32_bits(n) ((u32)(n)) | |
170 | ||
1da177e4 | 171 | struct completion; |
df2e71fb | 172 | struct pt_regs; |
173 | struct user; | |
1da177e4 | 174 | |
070cb065 UKK |
175 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
176 | extern int _cond_resched(void); | |
177 | # define might_resched() _cond_resched() | |
178 | #else | |
179 | # define might_resched() do { } while (0) | |
180 | #endif | |
181 | ||
d902db1e | 182 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
3427445a | 183 | void ___might_sleep(const char *file, int line, int preempt_offset); |
d894837f | 184 | void __might_sleep(const char *file, int line, int preempt_offset); |
1da177e4 LT |
185 | /** |
186 | * might_sleep - annotation for functions that can sleep | |
187 | * | |
188 | * this macro will print a stack trace if it is executed in an atomic | |
189 | * context (spinlock, irq-handler, ...). | |
190 | * | |
191 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 192 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
193 | * supposed to. |
194 | */ | |
f8cbd99b | 195 | # define might_sleep() \ |
e4aafea2 | 196 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
00845eb9 | 197 | # define sched_annotate_sleep() (current->task_state_change = 0) |
1da177e4 | 198 | #else |
3427445a PZ |
199 | static inline void ___might_sleep(const char *file, int line, |
200 | int preempt_offset) { } | |
d894837f SK |
201 | static inline void __might_sleep(const char *file, int line, |
202 | int preempt_offset) { } | |
f8cbd99b | 203 | # define might_sleep() do { might_resched(); } while (0) |
1029a2b5 | 204 | # define sched_annotate_sleep() do { } while (0) |
1da177e4 LT |
205 | #endif |
206 | ||
368a5fa1 | 207 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 208 | |
c8299cb6 MN |
209 | /** |
210 | * abs - return absolute value of an argument | |
8f57e4d9 MN |
211 | * @x: the value. If it is unsigned type, it is converted to signed type first. |
212 | * char is treated as if it was signed (regardless of whether it really is) | |
213 | * but the macro's return type is preserved as char. | |
c8299cb6 | 214 | * |
8f57e4d9 | 215 | * Return: an absolute value of x. |
71a90484 | 216 | */ |
8f57e4d9 MN |
217 | #define abs(x) __abs_choose_expr(x, long long, \ |
218 | __abs_choose_expr(x, long, \ | |
219 | __abs_choose_expr(x, int, \ | |
220 | __abs_choose_expr(x, short, \ | |
221 | __abs_choose_expr(x, char, \ | |
222 | __builtin_choose_expr( \ | |
223 | __builtin_types_compatible_p(typeof(x), char), \ | |
224 | (char)({ signed char __x = (x); __x<0?-__x:__x; }), \ | |
225 | ((void)0))))))) | |
226 | ||
227 | #define __abs_choose_expr(x, type, other) __builtin_choose_expr( \ | |
228 | __builtin_types_compatible_p(typeof(x), signed type) || \ | |
229 | __builtin_types_compatible_p(typeof(x), unsigned type), \ | |
230 | ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other) | |
c8299cb6 | 231 | |
89770b0a DB |
232 | /** |
233 | * reciprocal_scale - "scale" a value into range [0, ep_ro) | |
234 | * @val: value | |
235 | * @ep_ro: right open interval endpoint | |
236 | * | |
237 | * Perform a "reciprocal multiplication" in order to "scale" a value into | |
238 | * range [0, ep_ro), where the upper interval endpoint is right-open. | |
239 | * This is useful, e.g. for accessing a index of an array containing | |
240 | * ep_ro elements, for example. Think of it as sort of modulus, only that | |
241 | * the result isn't that of modulo. ;) Note that if initial input is a | |
242 | * small value, then result will return 0. | |
243 | * | |
244 | * Return: a result based on val in interval [0, ep_ro). | |
245 | */ | |
246 | static inline u32 reciprocal_scale(u32 val, u32 ep_ro) | |
247 | { | |
248 | return (u32)(((u64) val * ep_ro) >> 32); | |
249 | } | |
250 | ||
386e7906 AL |
251 | #if defined(CONFIG_MMU) && \ |
252 | (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)) | |
9ec23531 DH |
253 | #define might_fault() __might_fault(__FILE__, __LINE__) |
254 | void __might_fault(const char *file, int line); | |
3ee1afa3 | 255 | #else |
662bbcb2 | 256 | static inline void might_fault(void) { } |
3ee1afa3 NP |
257 | #endif |
258 | ||
e041c683 | 259 | extern struct atomic_notifier_head panic_notifier_list; |
c7ff0d9c | 260 | extern long (*panic_blink)(int state); |
9402c95f | 261 | __printf(1, 2) |
4da47859 | 262 | void panic(const char *fmt, ...) |
ff2d8b19 | 263 | __noreturn __cold; |
ebc41f20 | 264 | void nmi_panic(struct pt_regs *regs, const char *msg); |
dd287796 AM |
265 | extern void oops_enter(void); |
266 | extern void oops_exit(void); | |
863a6049 | 267 | void print_oops_end_marker(void); |
dd287796 | 268 | extern int oops_may_print(void); |
9402c95f | 269 | void do_exit(long error_code) |
ff2d8b19 | 270 | __noreturn; |
9402c95f | 271 | void complete_and_exit(struct completion *, long) |
ff2d8b19 | 272 | __noreturn; |
33ee3b2e AD |
273 | |
274 | /* Internal, do not use. */ | |
275 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); | |
276 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); | |
277 | ||
278 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); | |
279 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); | |
4c925d60 EZ |
280 | |
281 | /** | |
282 | * kstrtoul - convert a string to an unsigned long | |
283 | * @s: The start of the string. The string must be null-terminated, and may also | |
284 | * include a single newline before its terminating null. The first character | |
285 | * may also be a plus sign, but not a minus sign. | |
286 | * @base: The number base to use. The maximum supported base is 16. If base is | |
287 | * given as 0, then the base of the string is automatically detected with the | |
288 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
289 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
290 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
291 | * @res: Where to write the result of the conversion on success. | |
292 | * | |
293 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
294 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
295 | * be checked. | |
296 | */ | |
33ee3b2e AD |
297 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) |
298 | { | |
299 | /* | |
300 | * We want to shortcut function call, but | |
301 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. | |
302 | */ | |
303 | if (sizeof(unsigned long) == sizeof(unsigned long long) && | |
304 | __alignof__(unsigned long) == __alignof__(unsigned long long)) | |
305 | return kstrtoull(s, base, (unsigned long long *)res); | |
306 | else | |
307 | return _kstrtoul(s, base, res); | |
308 | } | |
309 | ||
4c925d60 EZ |
310 | /** |
311 | * kstrtol - convert a string to a long | |
312 | * @s: The start of the string. The string must be null-terminated, and may also | |
313 | * include a single newline before its terminating null. The first character | |
314 | * may also be a plus sign or a minus sign. | |
315 | * @base: The number base to use. The maximum supported base is 16. If base is | |
316 | * given as 0, then the base of the string is automatically detected with the | |
317 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
318 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
319 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
320 | * @res: Where to write the result of the conversion on success. | |
321 | * | |
322 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
323 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
324 | * be checked. | |
325 | */ | |
33ee3b2e AD |
326 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) |
327 | { | |
328 | /* | |
329 | * We want to shortcut function call, but | |
330 | * __builtin_types_compatible_p(long, long long) = 0. | |
331 | */ | |
332 | if (sizeof(long) == sizeof(long long) && | |
333 | __alignof__(long) == __alignof__(long long)) | |
334 | return kstrtoll(s, base, (long long *)res); | |
335 | else | |
336 | return _kstrtol(s, base, res); | |
337 | } | |
338 | ||
339 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); | |
340 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); | |
341 | ||
342 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) | |
343 | { | |
344 | return kstrtoull(s, base, res); | |
345 | } | |
346 | ||
347 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) | |
348 | { | |
349 | return kstrtoll(s, base, res); | |
350 | } | |
351 | ||
352 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) | |
353 | { | |
354 | return kstrtouint(s, base, res); | |
355 | } | |
356 | ||
357 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) | |
358 | { | |
359 | return kstrtoint(s, base, res); | |
360 | } | |
361 | ||
362 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); | |
363 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); | |
364 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); | |
365 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); | |
ef951599 | 366 | int __must_check kstrtobool(const char *s, bool *res); |
33ee3b2e | 367 | |
c196e32a AD |
368 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); |
369 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); | |
370 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); | |
371 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); | |
372 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); | |
373 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); | |
374 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); | |
375 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); | |
376 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); | |
377 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); | |
ef951599 | 378 | int __must_check kstrtobool_from_user(const char __user *s, size_t count, bool *res); |
c196e32a AD |
379 | |
380 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) | |
381 | { | |
382 | return kstrtoull_from_user(s, count, base, res); | |
383 | } | |
384 | ||
385 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) | |
386 | { | |
387 | return kstrtoll_from_user(s, count, base, res); | |
388 | } | |
389 | ||
390 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) | |
391 | { | |
392 | return kstrtouint_from_user(s, count, base, res); | |
393 | } | |
394 | ||
395 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) | |
396 | { | |
397 | return kstrtoint_from_user(s, count, base, res); | |
398 | } | |
399 | ||
67d0a075 JP |
400 | /* Obsolete, do not use. Use kstrto<foo> instead */ |
401 | ||
1da177e4 LT |
402 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
403 | extern long simple_strtol(const char *,char **,unsigned int); | |
404 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
405 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
33ee3b2e | 406 | |
1ac101a5 KH |
407 | extern int num_to_str(char *buf, int size, unsigned long long num); |
408 | ||
67d0a075 JP |
409 | /* lib/printf utilities */ |
410 | ||
b9075fa9 JP |
411 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
412 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | |
413 | extern __printf(3, 4) | |
414 | int snprintf(char *buf, size_t size, const char *fmt, ...); | |
415 | extern __printf(3, 0) | |
416 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
417 | extern __printf(3, 4) | |
418 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | |
419 | extern __printf(3, 0) | |
420 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
48a27055 | 421 | extern __printf(2, 3) __malloc |
b9075fa9 | 422 | char *kasprintf(gfp_t gfp, const char *fmt, ...); |
48a27055 | 423 | extern __printf(2, 0) __malloc |
8db14860 | 424 | char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
0a9df786 RV |
425 | extern __printf(2, 0) |
426 | const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args); | |
1da177e4 | 427 | |
6061d949 JP |
428 | extern __scanf(2, 3) |
429 | int sscanf(const char *, const char *, ...); | |
430 | extern __scanf(2, 0) | |
431 | int vsscanf(const char *, const char *, va_list); | |
1da177e4 LT |
432 | |
433 | extern int get_option(char **str, int *pint); | |
434 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 435 | extern unsigned long long memparse(const char *ptr, char **retptr); |
6ccc72b8 | 436 | extern bool parse_option_str(const char *str, const char *option); |
1da177e4 | 437 | |
5e376613 | 438 | extern int core_kernel_text(unsigned long addr); |
cdbe61bf | 439 | extern int core_kernel_data(unsigned long addr); |
1da177e4 LT |
440 | extern int __kernel_text_address(unsigned long addr); |
441 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 442 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 443 | |
1da177e4 LT |
444 | unsigned long int_sqrt(unsigned long); |
445 | ||
1da177e4 LT |
446 | extern void bust_spinlocks(int yes); |
447 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ | |
aa727107 | 448 | extern int panic_timeout; |
1da177e4 | 449 | extern int panic_on_oops; |
8da5adda | 450 | extern int panic_on_unrecovered_nmi; |
5211a242 | 451 | extern int panic_on_io_nmi; |
9e3961a0 | 452 | extern int panic_on_warn; |
088e9d25 | 453 | extern int sysctl_panic_on_rcu_stall; |
55af7796 | 454 | extern int sysctl_panic_on_stackoverflow; |
5375b708 HD |
455 | |
456 | extern bool crash_kexec_post_notifiers; | |
457 | ||
1717f209 HK |
458 | /* |
459 | * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It | |
460 | * holds a CPU number which is executing panic() currently. A value of | |
461 | * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec(). | |
462 | */ | |
463 | extern atomic_t panic_cpu; | |
464 | #define PANIC_CPU_INVALID -1 | |
465 | ||
5800dc3c JB |
466 | /* |
467 | * Only to be used by arch init code. If the user over-wrote the default | |
468 | * CONFIG_PANIC_TIMEOUT, honor it. | |
469 | */ | |
470 | static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout) | |
471 | { | |
472 | if (panic_timeout == arch_default_timeout) | |
473 | panic_timeout = timeout; | |
474 | } | |
1da177e4 | 475 | extern const char *print_tainted(void); |
373d4d09 RR |
476 | enum lockdep_ok { |
477 | LOCKDEP_STILL_OK, | |
478 | LOCKDEP_NOW_UNRELIABLE | |
479 | }; | |
480 | extern void add_taint(unsigned flag, enum lockdep_ok); | |
25ddbb18 AK |
481 | extern int test_taint(unsigned flag); |
482 | extern unsigned long get_taint(void); | |
b920de1b | 483 | extern int root_mountflags; |
1da177e4 | 484 | |
2ce802f6 TH |
485 | extern bool early_boot_irqs_disabled; |
486 | ||
1da177e4 LT |
487 | /* Values used for system_state */ |
488 | extern enum system_states { | |
489 | SYSTEM_BOOTING, | |
490 | SYSTEM_RUNNING, | |
491 | SYSTEM_HALT, | |
492 | SYSTEM_POWER_OFF, | |
493 | SYSTEM_RESTART, | |
494 | } system_state; | |
495 | ||
25ddbb18 AK |
496 | #define TAINT_PROPRIETARY_MODULE 0 |
497 | #define TAINT_FORCED_MODULE 1 | |
8c90487c | 498 | #define TAINT_CPU_OUT_OF_SPEC 2 |
25ddbb18 AK |
499 | #define TAINT_FORCED_RMMOD 3 |
500 | #define TAINT_MACHINE_CHECK 4 | |
501 | #define TAINT_BAD_PAGE 5 | |
502 | #define TAINT_USER 6 | |
503 | #define TAINT_DIE 7 | |
504 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
505 | #define TAINT_WARN 9 | |
26e9a397 | 506 | #define TAINT_CRAP 10 |
92946bc7 | 507 | #define TAINT_FIRMWARE_WORKAROUND 11 |
2449b8ba | 508 | #define TAINT_OOT_MODULE 12 |
66cc69e3 | 509 | #define TAINT_UNSIGNED_MODULE 13 |
69361eef | 510 | #define TAINT_SOFTLOCKUP 14 |
c5f45465 | 511 | #define TAINT_LIVEPATCH 15 |
1da177e4 | 512 | |
3fc95772 HH |
513 | extern const char hex_asc[]; |
514 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
515 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
516 | ||
55036ba7 | 517 | static inline char *hex_byte_pack(char *buf, u8 byte) |
3fc95772 HH |
518 | { |
519 | *buf++ = hex_asc_hi(byte); | |
520 | *buf++ = hex_asc_lo(byte); | |
521 | return buf; | |
522 | } | |
99eaf3c4 | 523 | |
c26d436c AN |
524 | extern const char hex_asc_upper[]; |
525 | #define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)] | |
526 | #define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4] | |
527 | ||
528 | static inline char *hex_byte_pack_upper(char *buf, u8 byte) | |
529 | { | |
530 | *buf++ = hex_asc_upper_hi(byte); | |
531 | *buf++ = hex_asc_upper_lo(byte); | |
532 | return buf; | |
533 | } | |
534 | ||
90378889 | 535 | extern int hex_to_bin(char ch); |
b7804983 | 536 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
53d91c5c | 537 | extern char *bin2hex(char *dst, const void *src, size_t count); |
90378889 | 538 | |
a69f5edb | 539 | bool mac_pton(const char *s, u8 *mac); |
4cd5773a | 540 | |
526211bc IM |
541 | /* |
542 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
543 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
544 | * | |
545 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
546 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 547 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
548 | * file, which gives a means for the kernel and userspace to interact. |
549 | * Place a tracing_off() in the kernel where you want tracing to end. | |
550 | * From user space, examine the trace, and then echo 1 > tracing_on | |
551 | * to continue tracing. | |
552 | * | |
553 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
554 | * by things like suspend to ram where disabling the recording of the | |
555 | * trace is not enough, but tracing must actually stop because things | |
556 | * like calling smp_processor_id() may crash the system. | |
557 | * | |
558 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 559 | */ |
cecbca96 FW |
560 | |
561 | enum ftrace_dump_mode { | |
562 | DUMP_NONE, | |
563 | DUMP_ALL, | |
564 | DUMP_ORIG, | |
565 | }; | |
566 | ||
526211bc | 567 | #ifdef CONFIG_TRACING |
93d68e52 SR |
568 | void tracing_on(void); |
569 | void tracing_off(void); | |
570 | int tracing_is_on(void); | |
ad909e21 SRRH |
571 | void tracing_snapshot(void); |
572 | void tracing_snapshot_alloc(void); | |
93d68e52 | 573 | |
526211bc IM |
574 | extern void tracing_start(void); |
575 | extern void tracing_stop(void); | |
526211bc | 576 | |
b9075fa9 JP |
577 | static inline __printf(1, 2) |
578 | void ____trace_printk_check_format(const char *fmt, ...) | |
769b0441 FW |
579 | { |
580 | } | |
581 | #define __trace_printk_check_format(fmt, args...) \ | |
582 | do { \ | |
583 | if (0) \ | |
584 | ____trace_printk_check_format(fmt, ##args); \ | |
585 | } while (0) | |
586 | ||
526211bc IM |
587 | /** |
588 | * trace_printk - printf formatting in the ftrace buffer | |
589 | * @fmt: the printf format for printing | |
590 | * | |
591 | * Note: __trace_printk is an internal function for trace_printk and | |
592 | * the @ip is passed in via the trace_printk macro. | |
593 | * | |
594 | * This function allows a kernel developer to debug fast path sections | |
595 | * that printk is not appropriate for. By scattering in various | |
596 | * printk like tracing in the code, a developer can quickly see | |
597 | * where problems are occurring. | |
598 | * | |
599 | * This is intended as a debugging tool for the developer only. | |
600 | * Please refrain from leaving trace_printks scattered around in | |
09ae7234 SRRH |
601 | * your code. (Extra memory is used for special buffers that are |
602 | * allocated when trace_printk() is used) | |
9d3c752c SRRH |
603 | * |
604 | * A little optization trick is done here. If there's only one | |
605 | * argument, there's no need to scan the string for printf formats. | |
606 | * The trace_puts() will suffice. But how can we take advantage of | |
607 | * using trace_puts() when trace_printk() has only one argument? | |
608 | * By stringifying the args and checking the size we can tell | |
609 | * whether or not there are args. __stringify((__VA_ARGS__)) will | |
610 | * turn into "()\0" with a size of 3 when there are no args, anything | |
611 | * else will be bigger. All we need to do is define a string to this, | |
612 | * and then take its size and compare to 3. If it's bigger, use | |
613 | * do_trace_printk() otherwise, optimize it to trace_puts(). Then just | |
614 | * let gcc optimize the rest. | |
526211bc | 615 | */ |
769b0441 | 616 | |
9d3c752c SRRH |
617 | #define trace_printk(fmt, ...) \ |
618 | do { \ | |
619 | char _______STR[] = __stringify((__VA_ARGS__)); \ | |
620 | if (sizeof(_______STR) > 3) \ | |
621 | do_trace_printk(fmt, ##__VA_ARGS__); \ | |
622 | else \ | |
623 | trace_puts(fmt); \ | |
624 | } while (0) | |
625 | ||
626 | #define do_trace_printk(fmt, args...) \ | |
769b0441 | 627 | do { \ |
3debb0a9 | 628 | static const char *trace_printk_fmt __used \ |
07d777fe SR |
629 | __attribute__((section("__trace_printk_fmt"))) = \ |
630 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
631 | \ | |
769b0441 | 632 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 | 633 | \ |
07d777fe | 634 | if (__builtin_constant_p(fmt)) \ |
48ead020 | 635 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
07d777fe SR |
636 | else \ |
637 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
638 | } while (0) |
639 | ||
b9075fa9 JP |
640 | extern __printf(2, 3) |
641 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | |
48ead020 | 642 | |
b9075fa9 JP |
643 | extern __printf(2, 3) |
644 | int __trace_printk(unsigned long ip, const char *fmt, ...); | |
769b0441 | 645 | |
09ae7234 SRRH |
646 | /** |
647 | * trace_puts - write a string into the ftrace buffer | |
648 | * @str: the string to record | |
649 | * | |
650 | * Note: __trace_bputs is an internal function for trace_puts and | |
651 | * the @ip is passed in via the trace_puts macro. | |
652 | * | |
653 | * This is similar to trace_printk() but is made for those really fast | |
654 | * paths that a developer wants the least amount of "Heisenbug" affects, | |
655 | * where the processing of the print format is still too much. | |
656 | * | |
657 | * This function allows a kernel developer to debug fast path sections | |
658 | * that printk is not appropriate for. By scattering in various | |
659 | * printk like tracing in the code, a developer can quickly see | |
660 | * where problems are occurring. | |
661 | * | |
662 | * This is intended as a debugging tool for the developer only. | |
663 | * Please refrain from leaving trace_puts scattered around in | |
664 | * your code. (Extra memory is used for special buffers that are | |
665 | * allocated when trace_puts() is used) | |
666 | * | |
667 | * Returns: 0 if nothing was written, positive # if string was. | |
668 | * (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) | |
669 | */ | |
670 | ||
09ae7234 | 671 | #define trace_puts(str) ({ \ |
3debb0a9 | 672 | static const char *trace_printk_fmt __used \ |
09ae7234 SRRH |
673 | __attribute__((section("__trace_printk_fmt"))) = \ |
674 | __builtin_constant_p(str) ? str : NULL; \ | |
675 | \ | |
676 | if (__builtin_constant_p(str)) \ | |
677 | __trace_bputs(_THIS_IP_, trace_printk_fmt); \ | |
678 | else \ | |
679 | __trace_puts(_THIS_IP_, str, strlen(str)); \ | |
680 | }) | |
bcf312cf SR |
681 | extern int __trace_bputs(unsigned long ip, const char *str); |
682 | extern int __trace_puts(unsigned long ip, const char *str, int size); | |
09ae7234 | 683 | |
c142be8e | 684 | extern void trace_dump_stack(int skip); |
03889384 | 685 | |
48ead020 FW |
686 | /* |
687 | * The double __builtin_constant_p is because gcc will give us an error | |
688 | * if we try to allocate the static variable to fmt if it is not a | |
689 | * constant. Even with the outer if statement. | |
690 | */ | |
769b0441 FW |
691 | #define ftrace_vprintk(fmt, vargs) \ |
692 | do { \ | |
48ead020 | 693 | if (__builtin_constant_p(fmt)) { \ |
3debb0a9 | 694 | static const char *trace_printk_fmt __used \ |
48ead020 FW |
695 | __attribute__((section("__trace_printk_fmt"))) = \ |
696 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 697 | \ |
48ead020 FW |
698 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
699 | } else \ | |
700 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
701 | } while (0) |
702 | ||
8db14860 | 703 | extern __printf(2, 0) int |
48ead020 FW |
704 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
705 | ||
8db14860 | 706 | extern __printf(2, 0) int |
526211bc | 707 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
769b0441 | 708 | |
cecbca96 | 709 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 710 | #else |
526211bc IM |
711 | static inline void tracing_start(void) { } |
712 | static inline void tracing_stop(void) { } | |
e67bc51e | 713 | static inline void trace_dump_stack(int skip) { } |
93d68e52 SR |
714 | |
715 | static inline void tracing_on(void) { } | |
716 | static inline void tracing_off(void) { } | |
717 | static inline int tracing_is_on(void) { return 0; } | |
ad909e21 SRRH |
718 | static inline void tracing_snapshot(void) { } |
719 | static inline void tracing_snapshot_alloc(void) { } | |
93d68e52 | 720 | |
60efc15a MH |
721 | static inline __printf(1, 2) |
722 | int trace_printk(const char *fmt, ...) | |
526211bc IM |
723 | { |
724 | return 0; | |
725 | } | |
8db14860 | 726 | static __printf(1, 0) inline int |
526211bc IM |
727 | ftrace_vprintk(const char *fmt, va_list ap) |
728 | { | |
729 | return 0; | |
730 | } | |
cecbca96 | 731 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 732 | #endif /* CONFIG_TRACING */ |
526211bc | 733 | |
1da177e4 | 734 | /* |
bdf4bbaa | 735 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
736 | * strict type-checking.. See the |
737 | * "unnecessary" pointer comparison. | |
738 | */ | |
bdf4bbaa HH |
739 | #define min(x, y) ({ \ |
740 | typeof(x) _min1 = (x); \ | |
741 | typeof(y) _min2 = (y); \ | |
742 | (void) (&_min1 == &_min2); \ | |
743 | _min1 < _min2 ? _min1 : _min2; }) | |
744 | ||
745 | #define max(x, y) ({ \ | |
746 | typeof(x) _max1 = (x); \ | |
747 | typeof(y) _max2 = (y); \ | |
748 | (void) (&_max1 == &_max2); \ | |
749 | _max1 > _max2 ? _max1 : _max2; }) | |
750 | ||
2e1d06e1 MN |
751 | #define min3(x, y, z) min((typeof(x))min(x, y), z) |
752 | #define max3(x, y, z) max((typeof(x))max(x, y), z) | |
f27c85c5 | 753 | |
c8bf1336 MP |
754 | /** |
755 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero | |
756 | * @x: value1 | |
757 | * @y: value2 | |
758 | */ | |
759 | #define min_not_zero(x, y) ({ \ | |
760 | typeof(x) __x = (x); \ | |
761 | typeof(y) __y = (y); \ | |
762 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | |
763 | ||
bdf4bbaa HH |
764 | /** |
765 | * clamp - return a value clamped to a given range with strict typechecking | |
766 | * @val: current value | |
2e1d06e1 MN |
767 | * @lo: lowest allowable value |
768 | * @hi: highest allowable value | |
bdf4bbaa | 769 | * |
c185b07f | 770 | * This macro does strict typechecking of lo/hi to make sure they are of the |
bdf4bbaa HH |
771 | * same type as val. See the unnecessary pointer comparisons. |
772 | */ | |
2e1d06e1 | 773 | #define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi) |
1da177e4 LT |
774 | |
775 | /* | |
776 | * ..and if you can't take the strict | |
777 | * types, you can specify one yourself. | |
778 | * | |
bdf4bbaa HH |
779 | * Or not use min/max/clamp at all, of course. |
780 | */ | |
781 | #define min_t(type, x, y) ({ \ | |
782 | type __min1 = (x); \ | |
783 | type __min2 = (y); \ | |
784 | __min1 < __min2 ? __min1: __min2; }) | |
785 | ||
786 | #define max_t(type, x, y) ({ \ | |
787 | type __max1 = (x); \ | |
788 | type __max2 = (y); \ | |
789 | __max1 > __max2 ? __max1: __max2; }) | |
790 | ||
791 | /** | |
792 | * clamp_t - return a value clamped to a given range using a given type | |
793 | * @type: the type of variable to use | |
794 | * @val: current value | |
c185b07f MN |
795 | * @lo: minimum allowable value |
796 | * @hi: maximum allowable value | |
bdf4bbaa HH |
797 | * |
798 | * This macro does no typechecking and uses temporary variables of type | |
799 | * 'type' to make all the comparisons. | |
1da177e4 | 800 | */ |
c185b07f | 801 | #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) |
1da177e4 | 802 | |
bdf4bbaa HH |
803 | /** |
804 | * clamp_val - return a value clamped to a given range using val's type | |
805 | * @val: current value | |
c185b07f MN |
806 | * @lo: minimum allowable value |
807 | * @hi: maximum allowable value | |
bdf4bbaa HH |
808 | * |
809 | * This macro does no typechecking and uses temporary variables of whatever | |
810 | * type the input argument 'val' is. This is useful when val is an unsigned | |
811 | * type and min and max are literals that will otherwise be assigned a signed | |
812 | * integer type. | |
813 | */ | |
c185b07f | 814 | #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) |
1da177e4 | 815 | |
91f68b73 WF |
816 | |
817 | /* | |
818 | * swap - swap value of @a and @b | |
819 | */ | |
ac7b9004 PZ |
820 | #define swap(a, b) \ |
821 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 822 | |
1da177e4 LT |
823 | /** |
824 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
825 | * @ptr: the pointer to the member. |
826 | * @type: the type of the container struct this is embedded in. | |
827 | * @member: the name of the member within the struct. | |
828 | * | |
829 | */ | |
830 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
831 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
832 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 | 833 | |
b9d4f426 AL |
834 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
835 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
836 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
837 | #endif | |
9d00f92f | 838 | |
58f86cc8 | 839 | /* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ |
28b8d0c8 GCM |
840 | #define VERIFY_OCTAL_PERMISSIONS(perms) \ |
841 | (BUILD_BUG_ON_ZERO((perms) < 0) + \ | |
842 | BUILD_BUG_ON_ZERO((perms) > 0777) + \ | |
843 | /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ | |
844 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ | |
845 | BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ | |
846 | /* USER_WRITABLE >= GROUP_WRITABLE */ \ | |
847 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ | |
848 | /* OTHER_WRITABLE? Generally considered a bad idea. */ \ | |
849 | BUILD_BUG_ON_ZERO((perms) & 2) + \ | |
58f86cc8 | 850 | (perms)) |
1da177e4 | 851 | #endif |