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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_KERNEL_H |
3 | #define _LINUX_KERNEL_H | |
4 | ||
1da177e4 LT |
5 | |
6 | #include <stdarg.h> | |
7 | #include <linux/linkage.h> | |
8 | #include <linux/stddef.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/compiler.h> | |
11 | #include <linux/bitops.h> | |
f0d1b0b3 | 12 | #include <linux/log2.h> |
e0deaff4 | 13 | #include <linux/typecheck.h> |
968ab183 | 14 | #include <linux/printk.h> |
c7acec71 | 15 | #include <linux/build_bug.h> |
1da177e4 | 16 | #include <asm/byteorder.h> |
607ca46e | 17 | #include <uapi/linux/kernel.h> |
1da177e4 | 18 | |
4be929be AD |
19 | #define USHRT_MAX ((u16)(~0U)) |
20 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) | |
21 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) | |
1da177e4 LT |
22 | #define INT_MAX ((int)(~0U>>1)) |
23 | #define INT_MIN (-INT_MAX - 1) | |
24 | #define UINT_MAX (~0U) | |
25 | #define LONG_MAX ((long)(~0UL>>1)) | |
26 | #define LONG_MIN (-LONG_MAX - 1) | |
27 | #define ULONG_MAX (~0UL) | |
111ebb6e OH |
28 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
29 | #define LLONG_MIN (-LLONG_MAX - 1) | |
30 | #define ULLONG_MAX (~0ULL) | |
a3860c1c | 31 | #define SIZE_MAX (~(size_t)0) |
1da177e4 | 32 | |
89a07141 AE |
33 | #define U8_MAX ((u8)~0U) |
34 | #define S8_MAX ((s8)(U8_MAX>>1)) | |
35 | #define S8_MIN ((s8)(-S8_MAX - 1)) | |
36 | #define U16_MAX ((u16)~0U) | |
37 | #define S16_MAX ((s16)(U16_MAX>>1)) | |
38 | #define S16_MIN ((s16)(-S16_MAX - 1)) | |
39 | #define U32_MAX ((u32)~0U) | |
40 | #define S32_MAX ((s32)(U32_MAX>>1)) | |
41 | #define S32_MIN ((s32)(-S32_MAX - 1)) | |
42 | #define U64_MAX ((u64)~0ULL) | |
43 | #define S64_MAX ((s64)(U64_MAX>>1)) | |
44 | #define S64_MIN ((s64)(-S64_MAX - 1)) | |
45 | ||
1da177e4 LT |
46 | #define STACK_MAGIC 0xdeadbeef |
47 | ||
e8c97af0 RD |
48 | /** |
49 | * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value | |
50 | * @x: value to repeat | |
51 | * | |
52 | * NOTE: @x is not checked for > 0xff; larger values produce odd results. | |
53 | */ | |
44696908 DM |
54 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
55 | ||
3ca45a46 | 56 | /* @a is a power of 2 value */ |
a79ff731 | 57 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
ed067d4a | 58 | #define ALIGN_DOWN(x, a) __ALIGN_KERNEL((x) - ((a) - 1), (a)) |
9f93ff5b | 59 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
a83308e6 | 60 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 61 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 62 | |
d3849953 CH |
63 | /* generic data direction definitions */ |
64 | #define READ 0 | |
65 | #define WRITE 1 | |
66 | ||
e8c97af0 RD |
67 | /** |
68 | * ARRAY_SIZE - get the number of elements in array @arr | |
69 | * @arr: array to be sized | |
70 | */ | |
c5e631cf RR |
71 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
72 | ||
3ed605bc GP |
73 | #define u64_to_user_ptr(x) ( \ |
74 | { \ | |
24bf38e6 JH |
75 | typecheck(u64, (x)); \ |
76 | (void __user *)(uintptr_t)(x); \ | |
3ed605bc GP |
77 | } \ |
78 | ) | |
79 | ||
9b3be9f9 YL |
80 | /* |
81 | * This looks more complex than it should be. But we need to | |
82 | * get the type for the ~ right in round_down (it needs to be | |
83 | * as wide as the result!), and we want to evaluate the macro | |
84 | * arguments just once each. | |
85 | */ | |
86 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | |
87 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | |
88 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | |
89 | ||
e8c97af0 RD |
90 | /** |
91 | * FIELD_SIZEOF - get the size of a struct's field | |
92 | * @t: the target struct | |
93 | * @f: the target struct's field | |
94 | * Return: the size of @f in the struct definition without having a | |
95 | * declared instance of @t. | |
96 | */ | |
4552d5dc | 97 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
e8c97af0 | 98 | |
b5d3755a | 99 | #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP |
604df322 MY |
100 | |
101 | #define DIV_ROUND_DOWN_ULL(ll, d) \ | |
102 | ({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; }) | |
103 | ||
43072044 VK |
104 | #define DIV_ROUND_UP_ULL(ll, d) \ |
105 | DIV_ROUND_DOWN_ULL((unsigned long long)(ll) + (d) - 1, (d)) | |
36a26c69 NB |
106 | |
107 | #if BITS_PER_LONG == 32 | |
108 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) | |
109 | #else | |
110 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) | |
111 | #endif | |
074e61ec JM |
112 | |
113 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | |
b28efd54 EP |
114 | #define roundup(x, y) ( \ |
115 | { \ | |
6070bf35 | 116 | const typeof(y) __y = y; \ |
b28efd54 EP |
117 | (((x) + (__y - 1)) / __y) * __y; \ |
118 | } \ | |
119 | ) | |
686a0f3d EP |
120 | #define rounddown(x, y) ( \ |
121 | { \ | |
122 | typeof(x) __x = (x); \ | |
123 | __x - (__x % (y)); \ | |
124 | } \ | |
125 | ) | |
b6d86d3d GR |
126 | |
127 | /* | |
4f5901f5 NS |
128 | * Divide positive or negative dividend by positive or negative divisor |
129 | * and round to closest integer. Result is undefined for negative | |
e8c97af0 | 130 | * divisors if the dividend variable type is unsigned and for negative |
4f5901f5 | 131 | * dividends if the divisor variable type is unsigned. |
b6d86d3d | 132 | */ |
9fe06081 DW |
133 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
134 | { \ | |
b6d86d3d GR |
135 | typeof(x) __x = x; \ |
136 | typeof(divisor) __d = divisor; \ | |
c4e18497 | 137 | (((typeof(x))-1) > 0 || \ |
4f5901f5 NS |
138 | ((typeof(divisor))-1) > 0 || \ |
139 | (((__x) > 0) == ((__d) > 0))) ? \ | |
b6d86d3d GR |
140 | (((__x) + ((__d) / 2)) / (__d)) : \ |
141 | (((__x) - ((__d) / 2)) / (__d)); \ | |
9fe06081 DW |
142 | } \ |
143 | ) | |
f766093e JM |
144 | /* |
145 | * Same as above but for u64 dividends. divisor must be a 32-bit | |
146 | * number. | |
147 | */ | |
148 | #define DIV_ROUND_CLOSEST_ULL(x, divisor)( \ | |
149 | { \ | |
150 | typeof(divisor) __d = divisor; \ | |
151 | unsigned long long _tmp = (x) + (__d) / 2; \ | |
152 | do_div(_tmp, __d); \ | |
153 | _tmp; \ | |
154 | } \ | |
155 | ) | |
1da177e4 | 156 | |
9993bc63 SQ |
157 | /* |
158 | * Multiplies an integer by a fraction, while avoiding unnecessary | |
159 | * overflow or loss of precision. | |
160 | */ | |
161 | #define mult_frac(x, numer, denom)( \ | |
162 | { \ | |
163 | typeof(x) quot = (x) / (denom); \ | |
164 | typeof(x) rem = (x) % (denom); \ | |
165 | (quot * (numer)) + ((rem * (numer)) / (denom)); \ | |
166 | } \ | |
167 | ) | |
168 | ||
169 | ||
ca31e146 EGM |
170 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
171 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
172 | ||
90c699a9 | 173 | #ifdef CONFIG_LBDAF |
2da96acd JA |
174 | # include <asm/div64.h> |
175 | # define sector_div(a, b) do_div(a, b) | |
176 | #else | |
177 | # define sector_div(n, b)( \ | |
178 | { \ | |
179 | int _res; \ | |
180 | _res = (n) % (b); \ | |
181 | (n) /= (b); \ | |
182 | _res; \ | |
183 | } \ | |
184 | ) | |
185 | #endif | |
186 | ||
218e180e AM |
187 | /** |
188 | * upper_32_bits - return bits 32-63 of a number | |
189 | * @n: the number we're accessing | |
190 | * | |
191 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
192 | * the "right shift count >= width of type" warning when that quantity is | |
193 | * 32-bits. | |
194 | */ | |
195 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
196 | ||
204b885e JR |
197 | /** |
198 | * lower_32_bits - return bits 0-31 of a number | |
199 | * @n: the number we're accessing | |
200 | */ | |
201 | #define lower_32_bits(n) ((u32)(n)) | |
202 | ||
1da177e4 | 203 | struct completion; |
df2e71fb | 204 | struct pt_regs; |
205 | struct user; | |
1da177e4 | 206 | |
070cb065 UKK |
207 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
208 | extern int _cond_resched(void); | |
209 | # define might_resched() _cond_resched() | |
210 | #else | |
211 | # define might_resched() do { } while (0) | |
212 | #endif | |
213 | ||
d902db1e | 214 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
3427445a | 215 | void ___might_sleep(const char *file, int line, int preempt_offset); |
d894837f | 216 | void __might_sleep(const char *file, int line, int preempt_offset); |
1da177e4 LT |
217 | /** |
218 | * might_sleep - annotation for functions that can sleep | |
219 | * | |
220 | * this macro will print a stack trace if it is executed in an atomic | |
221 | * context (spinlock, irq-handler, ...). | |
222 | * | |
223 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 224 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
225 | * supposed to. |
226 | */ | |
f8cbd99b | 227 | # define might_sleep() \ |
e4aafea2 | 228 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
00845eb9 | 229 | # define sched_annotate_sleep() (current->task_state_change = 0) |
1da177e4 | 230 | #else |
3427445a PZ |
231 | static inline void ___might_sleep(const char *file, int line, |
232 | int preempt_offset) { } | |
d894837f SK |
233 | static inline void __might_sleep(const char *file, int line, |
234 | int preempt_offset) { } | |
f8cbd99b | 235 | # define might_sleep() do { might_resched(); } while (0) |
1029a2b5 | 236 | # define sched_annotate_sleep() do { } while (0) |
1da177e4 LT |
237 | #endif |
238 | ||
368a5fa1 | 239 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 240 | |
c8299cb6 MN |
241 | /** |
242 | * abs - return absolute value of an argument | |
8f57e4d9 MN |
243 | * @x: the value. If it is unsigned type, it is converted to signed type first. |
244 | * char is treated as if it was signed (regardless of whether it really is) | |
245 | * but the macro's return type is preserved as char. | |
c8299cb6 | 246 | * |
8f57e4d9 | 247 | * Return: an absolute value of x. |
71a90484 | 248 | */ |
8f57e4d9 MN |
249 | #define abs(x) __abs_choose_expr(x, long long, \ |
250 | __abs_choose_expr(x, long, \ | |
251 | __abs_choose_expr(x, int, \ | |
252 | __abs_choose_expr(x, short, \ | |
253 | __abs_choose_expr(x, char, \ | |
254 | __builtin_choose_expr( \ | |
255 | __builtin_types_compatible_p(typeof(x), char), \ | |
256 | (char)({ signed char __x = (x); __x<0?-__x:__x; }), \ | |
257 | ((void)0))))))) | |
258 | ||
259 | #define __abs_choose_expr(x, type, other) __builtin_choose_expr( \ | |
260 | __builtin_types_compatible_p(typeof(x), signed type) || \ | |
261 | __builtin_types_compatible_p(typeof(x), unsigned type), \ | |
262 | ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other) | |
c8299cb6 | 263 | |
89770b0a DB |
264 | /** |
265 | * reciprocal_scale - "scale" a value into range [0, ep_ro) | |
266 | * @val: value | |
267 | * @ep_ro: right open interval endpoint | |
268 | * | |
269 | * Perform a "reciprocal multiplication" in order to "scale" a value into | |
e8c97af0 | 270 | * range [0, @ep_ro), where the upper interval endpoint is right-open. |
89770b0a | 271 | * This is useful, e.g. for accessing a index of an array containing |
e8c97af0 | 272 | * @ep_ro elements, for example. Think of it as sort of modulus, only that |
89770b0a DB |
273 | * the result isn't that of modulo. ;) Note that if initial input is a |
274 | * small value, then result will return 0. | |
275 | * | |
e8c97af0 | 276 | * Return: a result based on @val in interval [0, @ep_ro). |
89770b0a DB |
277 | */ |
278 | static inline u32 reciprocal_scale(u32 val, u32 ep_ro) | |
279 | { | |
280 | return (u32)(((u64) val * ep_ro) >> 32); | |
281 | } | |
282 | ||
386e7906 AL |
283 | #if defined(CONFIG_MMU) && \ |
284 | (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)) | |
9ec23531 DH |
285 | #define might_fault() __might_fault(__FILE__, __LINE__) |
286 | void __might_fault(const char *file, int line); | |
3ee1afa3 | 287 | #else |
662bbcb2 | 288 | static inline void might_fault(void) { } |
3ee1afa3 NP |
289 | #endif |
290 | ||
e041c683 | 291 | extern struct atomic_notifier_head panic_notifier_list; |
c7ff0d9c | 292 | extern long (*panic_blink)(int state); |
9402c95f | 293 | __printf(1, 2) |
9af6528e | 294 | void panic(const char *fmt, ...) __noreturn __cold; |
ebc41f20 | 295 | void nmi_panic(struct pt_regs *regs, const char *msg); |
dd287796 AM |
296 | extern void oops_enter(void); |
297 | extern void oops_exit(void); | |
863a6049 | 298 | void print_oops_end_marker(void); |
dd287796 | 299 | extern int oops_may_print(void); |
9af6528e PZ |
300 | void do_exit(long error_code) __noreturn; |
301 | void complete_and_exit(struct completion *, long) __noreturn; | |
33ee3b2e | 302 | |
7a46ec0e KC |
303 | #ifdef CONFIG_ARCH_HAS_REFCOUNT |
304 | void refcount_error_report(struct pt_regs *regs, const char *err); | |
305 | #else | |
306 | static inline void refcount_error_report(struct pt_regs *regs, const char *err) | |
307 | { } | |
308 | #endif | |
309 | ||
49b04f8a DH |
310 | #ifdef CONFIG_LOCK_DOWN_KERNEL |
311 | extern bool __kernel_is_locked_down(const char *what, bool first); | |
312 | #else | |
313 | static inline bool __kernel_is_locked_down(const char *what, bool first) | |
314 | { | |
315 | return false; | |
316 | } | |
317 | #endif | |
318 | ||
319 | #define kernel_is_locked_down(what) \ | |
320 | ({ \ | |
321 | static bool message_given; \ | |
322 | bool locked_down = __kernel_is_locked_down(what, !message_given); \ | |
323 | message_given = true; \ | |
324 | locked_down; \ | |
325 | }) | |
326 | ||
33ee3b2e AD |
327 | /* Internal, do not use. */ |
328 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); | |
329 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); | |
330 | ||
331 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); | |
332 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); | |
4c925d60 EZ |
333 | |
334 | /** | |
335 | * kstrtoul - convert a string to an unsigned long | |
336 | * @s: The start of the string. The string must be null-terminated, and may also | |
337 | * include a single newline before its terminating null. The first character | |
338 | * may also be a plus sign, but not a minus sign. | |
339 | * @base: The number base to use. The maximum supported base is 16. If base is | |
340 | * given as 0, then the base of the string is automatically detected with the | |
341 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
342 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
343 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
344 | * @res: Where to write the result of the conversion on success. | |
345 | * | |
346 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
347 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
348 | * be checked. | |
349 | */ | |
33ee3b2e AD |
350 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) |
351 | { | |
352 | /* | |
353 | * We want to shortcut function call, but | |
354 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. | |
355 | */ | |
356 | if (sizeof(unsigned long) == sizeof(unsigned long long) && | |
357 | __alignof__(unsigned long) == __alignof__(unsigned long long)) | |
358 | return kstrtoull(s, base, (unsigned long long *)res); | |
359 | else | |
360 | return _kstrtoul(s, base, res); | |
361 | } | |
362 | ||
4c925d60 EZ |
363 | /** |
364 | * kstrtol - convert a string to a long | |
365 | * @s: The start of the string. The string must be null-terminated, and may also | |
366 | * include a single newline before its terminating null. The first character | |
367 | * may also be a plus sign or a minus sign. | |
368 | * @base: The number base to use. The maximum supported base is 16. If base is | |
369 | * given as 0, then the base of the string is automatically detected with the | |
370 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
371 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
372 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
373 | * @res: Where to write the result of the conversion on success. | |
374 | * | |
375 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
376 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
377 | * be checked. | |
378 | */ | |
33ee3b2e AD |
379 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) |
380 | { | |
381 | /* | |
382 | * We want to shortcut function call, but | |
383 | * __builtin_types_compatible_p(long, long long) = 0. | |
384 | */ | |
385 | if (sizeof(long) == sizeof(long long) && | |
386 | __alignof__(long) == __alignof__(long long)) | |
387 | return kstrtoll(s, base, (long long *)res); | |
388 | else | |
389 | return _kstrtol(s, base, res); | |
390 | } | |
391 | ||
392 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); | |
393 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); | |
394 | ||
395 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) | |
396 | { | |
397 | return kstrtoull(s, base, res); | |
398 | } | |
399 | ||
400 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) | |
401 | { | |
402 | return kstrtoll(s, base, res); | |
403 | } | |
404 | ||
405 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) | |
406 | { | |
407 | return kstrtouint(s, base, res); | |
408 | } | |
409 | ||
410 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) | |
411 | { | |
412 | return kstrtoint(s, base, res); | |
413 | } | |
414 | ||
415 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); | |
416 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); | |
417 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); | |
418 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); | |
ef951599 | 419 | int __must_check kstrtobool(const char *s, bool *res); |
33ee3b2e | 420 | |
c196e32a AD |
421 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); |
422 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); | |
423 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); | |
424 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); | |
425 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); | |
426 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); | |
427 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); | |
428 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); | |
429 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); | |
430 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); | |
ef951599 | 431 | int __must_check kstrtobool_from_user(const char __user *s, size_t count, bool *res); |
c196e32a AD |
432 | |
433 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) | |
434 | { | |
435 | return kstrtoull_from_user(s, count, base, res); | |
436 | } | |
437 | ||
438 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) | |
439 | { | |
440 | return kstrtoll_from_user(s, count, base, res); | |
441 | } | |
442 | ||
443 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) | |
444 | { | |
445 | return kstrtouint_from_user(s, count, base, res); | |
446 | } | |
447 | ||
448 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) | |
449 | { | |
450 | return kstrtoint_from_user(s, count, base, res); | |
451 | } | |
452 | ||
67d0a075 JP |
453 | /* Obsolete, do not use. Use kstrto<foo> instead */ |
454 | ||
1da177e4 LT |
455 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
456 | extern long simple_strtol(const char *,char **,unsigned int); | |
457 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
458 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
33ee3b2e | 459 | |
1ac101a5 KH |
460 | extern int num_to_str(char *buf, int size, unsigned long long num); |
461 | ||
67d0a075 JP |
462 | /* lib/printf utilities */ |
463 | ||
b9075fa9 JP |
464 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
465 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | |
466 | extern __printf(3, 4) | |
467 | int snprintf(char *buf, size_t size, const char *fmt, ...); | |
468 | extern __printf(3, 0) | |
469 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
470 | extern __printf(3, 4) | |
471 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | |
472 | extern __printf(3, 0) | |
473 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
48a27055 | 474 | extern __printf(2, 3) __malloc |
b9075fa9 | 475 | char *kasprintf(gfp_t gfp, const char *fmt, ...); |
48a27055 | 476 | extern __printf(2, 0) __malloc |
8db14860 | 477 | char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
0a9df786 RV |
478 | extern __printf(2, 0) |
479 | const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args); | |
1da177e4 | 480 | |
6061d949 JP |
481 | extern __scanf(2, 3) |
482 | int sscanf(const char *, const char *, ...); | |
483 | extern __scanf(2, 0) | |
484 | int vsscanf(const char *, const char *, va_list); | |
1da177e4 LT |
485 | |
486 | extern int get_option(char **str, int *pint); | |
487 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 488 | extern unsigned long long memparse(const char *ptr, char **retptr); |
6ccc72b8 | 489 | extern bool parse_option_str(const char *str, const char *option); |
f51b17c8 | 490 | extern char *next_arg(char *args, char **param, char **val); |
1da177e4 | 491 | |
5e376613 | 492 | extern int core_kernel_text(unsigned long addr); |
cdbe61bf | 493 | extern int core_kernel_data(unsigned long addr); |
1da177e4 LT |
494 | extern int __kernel_text_address(unsigned long addr); |
495 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 496 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 497 | |
1da177e4 LT |
498 | unsigned long int_sqrt(unsigned long); |
499 | ||
1da177e4 LT |
500 | extern void bust_spinlocks(int yes); |
501 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ | |
aa727107 | 502 | extern int panic_timeout; |
1da177e4 | 503 | extern int panic_on_oops; |
8da5adda | 504 | extern int panic_on_unrecovered_nmi; |
5211a242 | 505 | extern int panic_on_io_nmi; |
9e3961a0 | 506 | extern int panic_on_warn; |
088e9d25 | 507 | extern int sysctl_panic_on_rcu_stall; |
55af7796 | 508 | extern int sysctl_panic_on_stackoverflow; |
5375b708 HD |
509 | |
510 | extern bool crash_kexec_post_notifiers; | |
511 | ||
1717f209 HK |
512 | /* |
513 | * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It | |
514 | * holds a CPU number which is executing panic() currently. A value of | |
515 | * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec(). | |
516 | */ | |
517 | extern atomic_t panic_cpu; | |
518 | #define PANIC_CPU_INVALID -1 | |
519 | ||
5800dc3c JB |
520 | /* |
521 | * Only to be used by arch init code. If the user over-wrote the default | |
522 | * CONFIG_PANIC_TIMEOUT, honor it. | |
523 | */ | |
524 | static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout) | |
525 | { | |
526 | if (panic_timeout == arch_default_timeout) | |
527 | panic_timeout = timeout; | |
528 | } | |
1da177e4 | 529 | extern const char *print_tainted(void); |
373d4d09 RR |
530 | enum lockdep_ok { |
531 | LOCKDEP_STILL_OK, | |
532 | LOCKDEP_NOW_UNRELIABLE | |
533 | }; | |
534 | extern void add_taint(unsigned flag, enum lockdep_ok); | |
25ddbb18 AK |
535 | extern int test_taint(unsigned flag); |
536 | extern unsigned long get_taint(void); | |
b920de1b | 537 | extern int root_mountflags; |
1da177e4 | 538 | |
2ce802f6 TH |
539 | extern bool early_boot_irqs_disabled; |
540 | ||
69a78ff2 TG |
541 | /* |
542 | * Values used for system_state. Ordering of the states must not be changed | |
543 | * as code checks for <, <=, >, >= STATE. | |
544 | */ | |
1da177e4 LT |
545 | extern enum system_states { |
546 | SYSTEM_BOOTING, | |
69a78ff2 | 547 | SYSTEM_SCHEDULING, |
1da177e4 LT |
548 | SYSTEM_RUNNING, |
549 | SYSTEM_HALT, | |
550 | SYSTEM_POWER_OFF, | |
551 | SYSTEM_RESTART, | |
552 | } system_state; | |
553 | ||
25ddbb18 AK |
554 | #define TAINT_PROPRIETARY_MODULE 0 |
555 | #define TAINT_FORCED_MODULE 1 | |
8c90487c | 556 | #define TAINT_CPU_OUT_OF_SPEC 2 |
25ddbb18 AK |
557 | #define TAINT_FORCED_RMMOD 3 |
558 | #define TAINT_MACHINE_CHECK 4 | |
559 | #define TAINT_BAD_PAGE 5 | |
560 | #define TAINT_USER 6 | |
561 | #define TAINT_DIE 7 | |
562 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
563 | #define TAINT_WARN 9 | |
26e9a397 | 564 | #define TAINT_CRAP 10 |
92946bc7 | 565 | #define TAINT_FIRMWARE_WORKAROUND 11 |
2449b8ba | 566 | #define TAINT_OOT_MODULE 12 |
66cc69e3 | 567 | #define TAINT_UNSIGNED_MODULE 13 |
69361eef | 568 | #define TAINT_SOFTLOCKUP 14 |
c5f45465 | 569 | #define TAINT_LIVEPATCH 15 |
4efb442c BP |
570 | #define TAINT_AUX 16 |
571 | #define TAINT_FLAGS_COUNT 17 | |
7fd8329b PM |
572 | |
573 | struct taint_flag { | |
5eb7c0d0 LF |
574 | char c_true; /* character printed when tainted */ |
575 | char c_false; /* character printed when not tainted */ | |
7fd8329b PM |
576 | bool module; /* also show as a per-module taint flag */ |
577 | }; | |
578 | ||
579 | extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT]; | |
1da177e4 | 580 | |
3fc95772 HH |
581 | extern const char hex_asc[]; |
582 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
583 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
584 | ||
55036ba7 | 585 | static inline char *hex_byte_pack(char *buf, u8 byte) |
3fc95772 HH |
586 | { |
587 | *buf++ = hex_asc_hi(byte); | |
588 | *buf++ = hex_asc_lo(byte); | |
589 | return buf; | |
590 | } | |
99eaf3c4 | 591 | |
c26d436c AN |
592 | extern const char hex_asc_upper[]; |
593 | #define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)] | |
594 | #define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4] | |
595 | ||
596 | static inline char *hex_byte_pack_upper(char *buf, u8 byte) | |
597 | { | |
598 | *buf++ = hex_asc_upper_hi(byte); | |
599 | *buf++ = hex_asc_upper_lo(byte); | |
600 | return buf; | |
601 | } | |
602 | ||
90378889 | 603 | extern int hex_to_bin(char ch); |
b7804983 | 604 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
53d91c5c | 605 | extern char *bin2hex(char *dst, const void *src, size_t count); |
90378889 | 606 | |
a69f5edb | 607 | bool mac_pton(const char *s, u8 *mac); |
4cd5773a | 608 | |
526211bc IM |
609 | /* |
610 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
611 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
612 | * | |
613 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
614 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 615 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
616 | * file, which gives a means for the kernel and userspace to interact. |
617 | * Place a tracing_off() in the kernel where you want tracing to end. | |
618 | * From user space, examine the trace, and then echo 1 > tracing_on | |
619 | * to continue tracing. | |
620 | * | |
621 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
622 | * by things like suspend to ram where disabling the recording of the | |
623 | * trace is not enough, but tracing must actually stop because things | |
624 | * like calling smp_processor_id() may crash the system. | |
625 | * | |
626 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 627 | */ |
cecbca96 FW |
628 | |
629 | enum ftrace_dump_mode { | |
630 | DUMP_NONE, | |
631 | DUMP_ALL, | |
632 | DUMP_ORIG, | |
633 | }; | |
634 | ||
526211bc | 635 | #ifdef CONFIG_TRACING |
93d68e52 SR |
636 | void tracing_on(void); |
637 | void tracing_off(void); | |
638 | int tracing_is_on(void); | |
ad909e21 SRRH |
639 | void tracing_snapshot(void); |
640 | void tracing_snapshot_alloc(void); | |
93d68e52 | 641 | |
526211bc IM |
642 | extern void tracing_start(void); |
643 | extern void tracing_stop(void); | |
526211bc | 644 | |
b9075fa9 JP |
645 | static inline __printf(1, 2) |
646 | void ____trace_printk_check_format(const char *fmt, ...) | |
769b0441 FW |
647 | { |
648 | } | |
649 | #define __trace_printk_check_format(fmt, args...) \ | |
650 | do { \ | |
651 | if (0) \ | |
652 | ____trace_printk_check_format(fmt, ##args); \ | |
653 | } while (0) | |
654 | ||
526211bc IM |
655 | /** |
656 | * trace_printk - printf formatting in the ftrace buffer | |
657 | * @fmt: the printf format for printing | |
658 | * | |
e8c97af0 RD |
659 | * Note: __trace_printk is an internal function for trace_printk() and |
660 | * the @ip is passed in via the trace_printk() macro. | |
526211bc IM |
661 | * |
662 | * This function allows a kernel developer to debug fast path sections | |
663 | * that printk is not appropriate for. By scattering in various | |
664 | * printk like tracing in the code, a developer can quickly see | |
665 | * where problems are occurring. | |
666 | * | |
667 | * This is intended as a debugging tool for the developer only. | |
668 | * Please refrain from leaving trace_printks scattered around in | |
09ae7234 | 669 | * your code. (Extra memory is used for special buffers that are |
e8c97af0 | 670 | * allocated when trace_printk() is used.) |
9d3c752c SRRH |
671 | * |
672 | * A little optization trick is done here. If there's only one | |
673 | * argument, there's no need to scan the string for printf formats. | |
674 | * The trace_puts() will suffice. But how can we take advantage of | |
675 | * using trace_puts() when trace_printk() has only one argument? | |
676 | * By stringifying the args and checking the size we can tell | |
677 | * whether or not there are args. __stringify((__VA_ARGS__)) will | |
678 | * turn into "()\0" with a size of 3 when there are no args, anything | |
679 | * else will be bigger. All we need to do is define a string to this, | |
680 | * and then take its size and compare to 3. If it's bigger, use | |
681 | * do_trace_printk() otherwise, optimize it to trace_puts(). Then just | |
682 | * let gcc optimize the rest. | |
526211bc | 683 | */ |
769b0441 | 684 | |
9d3c752c SRRH |
685 | #define trace_printk(fmt, ...) \ |
686 | do { \ | |
687 | char _______STR[] = __stringify((__VA_ARGS__)); \ | |
688 | if (sizeof(_______STR) > 3) \ | |
689 | do_trace_printk(fmt, ##__VA_ARGS__); \ | |
690 | else \ | |
691 | trace_puts(fmt); \ | |
692 | } while (0) | |
693 | ||
694 | #define do_trace_printk(fmt, args...) \ | |
769b0441 | 695 | do { \ |
3debb0a9 | 696 | static const char *trace_printk_fmt __used \ |
07d777fe SR |
697 | __attribute__((section("__trace_printk_fmt"))) = \ |
698 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
699 | \ | |
769b0441 | 700 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 | 701 | \ |
07d777fe | 702 | if (__builtin_constant_p(fmt)) \ |
48ead020 | 703 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
07d777fe SR |
704 | else \ |
705 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
706 | } while (0) |
707 | ||
b9075fa9 JP |
708 | extern __printf(2, 3) |
709 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | |
48ead020 | 710 | |
b9075fa9 JP |
711 | extern __printf(2, 3) |
712 | int __trace_printk(unsigned long ip, const char *fmt, ...); | |
769b0441 | 713 | |
09ae7234 SRRH |
714 | /** |
715 | * trace_puts - write a string into the ftrace buffer | |
716 | * @str: the string to record | |
717 | * | |
718 | * Note: __trace_bputs is an internal function for trace_puts and | |
719 | * the @ip is passed in via the trace_puts macro. | |
720 | * | |
721 | * This is similar to trace_printk() but is made for those really fast | |
e8c97af0 | 722 | * paths that a developer wants the least amount of "Heisenbug" effects, |
09ae7234 SRRH |
723 | * where the processing of the print format is still too much. |
724 | * | |
725 | * This function allows a kernel developer to debug fast path sections | |
726 | * that printk is not appropriate for. By scattering in various | |
727 | * printk like tracing in the code, a developer can quickly see | |
728 | * where problems are occurring. | |
729 | * | |
730 | * This is intended as a debugging tool for the developer only. | |
731 | * Please refrain from leaving trace_puts scattered around in | |
732 | * your code. (Extra memory is used for special buffers that are | |
e8c97af0 | 733 | * allocated when trace_puts() is used.) |
09ae7234 SRRH |
734 | * |
735 | * Returns: 0 if nothing was written, positive # if string was. | |
736 | * (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) | |
737 | */ | |
738 | ||
09ae7234 | 739 | #define trace_puts(str) ({ \ |
3debb0a9 | 740 | static const char *trace_printk_fmt __used \ |
09ae7234 SRRH |
741 | __attribute__((section("__trace_printk_fmt"))) = \ |
742 | __builtin_constant_p(str) ? str : NULL; \ | |
743 | \ | |
744 | if (__builtin_constant_p(str)) \ | |
745 | __trace_bputs(_THIS_IP_, trace_printk_fmt); \ | |
746 | else \ | |
747 | __trace_puts(_THIS_IP_, str, strlen(str)); \ | |
748 | }) | |
bcf312cf SR |
749 | extern int __trace_bputs(unsigned long ip, const char *str); |
750 | extern int __trace_puts(unsigned long ip, const char *str, int size); | |
09ae7234 | 751 | |
c142be8e | 752 | extern void trace_dump_stack(int skip); |
03889384 | 753 | |
48ead020 FW |
754 | /* |
755 | * The double __builtin_constant_p is because gcc will give us an error | |
756 | * if we try to allocate the static variable to fmt if it is not a | |
757 | * constant. Even with the outer if statement. | |
758 | */ | |
769b0441 FW |
759 | #define ftrace_vprintk(fmt, vargs) \ |
760 | do { \ | |
48ead020 | 761 | if (__builtin_constant_p(fmt)) { \ |
3debb0a9 | 762 | static const char *trace_printk_fmt __used \ |
48ead020 FW |
763 | __attribute__((section("__trace_printk_fmt"))) = \ |
764 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 765 | \ |
48ead020 FW |
766 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
767 | } else \ | |
768 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
769 | } while (0) |
770 | ||
8db14860 | 771 | extern __printf(2, 0) int |
48ead020 FW |
772 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
773 | ||
8db14860 | 774 | extern __printf(2, 0) int |
526211bc | 775 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
769b0441 | 776 | |
cecbca96 | 777 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 778 | #else |
526211bc IM |
779 | static inline void tracing_start(void) { } |
780 | static inline void tracing_stop(void) { } | |
e67bc51e | 781 | static inline void trace_dump_stack(int skip) { } |
93d68e52 SR |
782 | |
783 | static inline void tracing_on(void) { } | |
784 | static inline void tracing_off(void) { } | |
785 | static inline int tracing_is_on(void) { return 0; } | |
ad909e21 SRRH |
786 | static inline void tracing_snapshot(void) { } |
787 | static inline void tracing_snapshot_alloc(void) { } | |
93d68e52 | 788 | |
60efc15a MH |
789 | static inline __printf(1, 2) |
790 | int trace_printk(const char *fmt, ...) | |
526211bc IM |
791 | { |
792 | return 0; | |
793 | } | |
8db14860 | 794 | static __printf(1, 0) inline int |
526211bc IM |
795 | ftrace_vprintk(const char *fmt, va_list ap) |
796 | { | |
797 | return 0; | |
798 | } | |
cecbca96 | 799 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 800 | #endif /* CONFIG_TRACING */ |
526211bc | 801 | |
1da177e4 | 802 | /* |
bdf4bbaa | 803 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
804 | * strict type-checking.. See the |
805 | * "unnecessary" pointer comparison. | |
806 | */ | |
589a9785 JB |
807 | #define __min(t1, t2, min1, min2, x, y) ({ \ |
808 | t1 min1 = (x); \ | |
809 | t2 min2 = (y); \ | |
810 | (void) (&min1 == &min2); \ | |
811 | min1 < min2 ? min1 : min2; }) | |
e8c97af0 RD |
812 | |
813 | /** | |
814 | * min - return minimum of two values of the same or compatible types | |
815 | * @x: first value | |
816 | * @y: second value | |
817 | */ | |
589a9785 JB |
818 | #define min(x, y) \ |
819 | __min(typeof(x), typeof(y), \ | |
820 | __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ | |
821 | x, y) | |
822 | ||
823 | #define __max(t1, t2, max1, max2, x, y) ({ \ | |
824 | t1 max1 = (x); \ | |
825 | t2 max2 = (y); \ | |
826 | (void) (&max1 == &max2); \ | |
827 | max1 > max2 ? max1 : max2; }) | |
e8c97af0 RD |
828 | |
829 | /** | |
830 | * max - return maximum of two values of the same or compatible types | |
831 | * @x: first value | |
832 | * @y: second value | |
833 | */ | |
589a9785 JB |
834 | #define max(x, y) \ |
835 | __max(typeof(x), typeof(y), \ | |
836 | __UNIQUE_ID(max1_), __UNIQUE_ID(max2_), \ | |
837 | x, y) | |
bdf4bbaa | 838 | |
e8c97af0 RD |
839 | /** |
840 | * min3 - return minimum of three values | |
841 | * @x: first value | |
842 | * @y: second value | |
843 | * @z: third value | |
844 | */ | |
2e1d06e1 | 845 | #define min3(x, y, z) min((typeof(x))min(x, y), z) |
e8c97af0 RD |
846 | |
847 | /** | |
848 | * max3 - return maximum of three values | |
849 | * @x: first value | |
850 | * @y: second value | |
851 | * @z: third value | |
852 | */ | |
2e1d06e1 | 853 | #define max3(x, y, z) max((typeof(x))max(x, y), z) |
f27c85c5 | 854 | |
c8bf1336 MP |
855 | /** |
856 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero | |
857 | * @x: value1 | |
858 | * @y: value2 | |
859 | */ | |
860 | #define min_not_zero(x, y) ({ \ | |
861 | typeof(x) __x = (x); \ | |
862 | typeof(y) __y = (y); \ | |
863 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | |
864 | ||
bdf4bbaa HH |
865 | /** |
866 | * clamp - return a value clamped to a given range with strict typechecking | |
867 | * @val: current value | |
2e1d06e1 MN |
868 | * @lo: lowest allowable value |
869 | * @hi: highest allowable value | |
bdf4bbaa | 870 | * |
e8c97af0 RD |
871 | * This macro does strict typechecking of @lo/@hi to make sure they are of the |
872 | * same type as @val. See the unnecessary pointer comparisons. | |
bdf4bbaa | 873 | */ |
2e1d06e1 | 874 | #define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi) |
1da177e4 LT |
875 | |
876 | /* | |
877 | * ..and if you can't take the strict | |
878 | * types, you can specify one yourself. | |
879 | * | |
bdf4bbaa HH |
880 | * Or not use min/max/clamp at all, of course. |
881 | */ | |
e8c97af0 RD |
882 | |
883 | /** | |
884 | * min_t - return minimum of two values, using the specified type | |
885 | * @type: data type to use | |
886 | * @x: first value | |
887 | * @y: second value | |
888 | */ | |
589a9785 JB |
889 | #define min_t(type, x, y) \ |
890 | __min(type, type, \ | |
891 | __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ | |
892 | x, y) | |
893 | ||
e8c97af0 RD |
894 | /** |
895 | * max_t - return maximum of two values, using the specified type | |
896 | * @type: data type to use | |
897 | * @x: first value | |
898 | * @y: second value | |
899 | */ | |
589a9785 JB |
900 | #define max_t(type, x, y) \ |
901 | __max(type, type, \ | |
902 | __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ | |
903 | x, y) | |
bdf4bbaa HH |
904 | |
905 | /** | |
906 | * clamp_t - return a value clamped to a given range using a given type | |
907 | * @type: the type of variable to use | |
908 | * @val: current value | |
c185b07f MN |
909 | * @lo: minimum allowable value |
910 | * @hi: maximum allowable value | |
bdf4bbaa HH |
911 | * |
912 | * This macro does no typechecking and uses temporary variables of type | |
e8c97af0 | 913 | * @type to make all the comparisons. |
1da177e4 | 914 | */ |
c185b07f | 915 | #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) |
1da177e4 | 916 | |
bdf4bbaa HH |
917 | /** |
918 | * clamp_val - return a value clamped to a given range using val's type | |
919 | * @val: current value | |
c185b07f MN |
920 | * @lo: minimum allowable value |
921 | * @hi: maximum allowable value | |
bdf4bbaa HH |
922 | * |
923 | * This macro does no typechecking and uses temporary variables of whatever | |
e8c97af0 RD |
924 | * type the input argument @val is. This is useful when @val is an unsigned |
925 | * type and @lo and @hi are literals that will otherwise be assigned a signed | |
bdf4bbaa HH |
926 | * integer type. |
927 | */ | |
c185b07f | 928 | #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) |
1da177e4 | 929 | |
91f68b73 | 930 | |
e8c97af0 RD |
931 | /** |
932 | * swap - swap values of @a and @b | |
933 | * @a: first value | |
934 | * @b: second value | |
91f68b73 | 935 | */ |
ac7b9004 PZ |
936 | #define swap(a, b) \ |
937 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 938 | |
1da177e4 LT |
939 | /** |
940 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
941 | * @ptr: the pointer to the member. |
942 | * @type: the type of the container struct this is embedded in. | |
943 | * @member: the name of the member within the struct. | |
944 | * | |
945 | */ | |
c7acec71 IA |
946 | #define container_of(ptr, type, member) ({ \ |
947 | void *__mptr = (void *)(ptr); \ | |
948 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ | |
949 | !__same_type(*(ptr), void), \ | |
950 | "pointer type mismatch in container_of()"); \ | |
951 | ((type *)(__mptr - offsetof(type, member))); }) | |
1da177e4 | 952 | |
b9d4f426 AL |
953 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
954 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
955 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
956 | #endif | |
9d00f92f | 957 | |
58f86cc8 | 958 | /* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ |
28b8d0c8 GCM |
959 | #define VERIFY_OCTAL_PERMISSIONS(perms) \ |
960 | (BUILD_BUG_ON_ZERO((perms) < 0) + \ | |
961 | BUILD_BUG_ON_ZERO((perms) > 0777) + \ | |
962 | /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ | |
963 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ | |
964 | BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ | |
965 | /* USER_WRITABLE >= GROUP_WRITABLE */ \ | |
966 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ | |
967 | /* OTHER_WRITABLE? Generally considered a bad idea. */ \ | |
968 | BUILD_BUG_ON_ZERO((perms) & 2) + \ | |
58f86cc8 | 969 | (perms)) |
1da177e4 | 970 | #endif |