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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> |
c7acec71 | 14 | #include <linux/build_bug.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 | 31 | |
89a07141 AE |
32 | #define U8_MAX ((u8)~0U) |
33 | #define S8_MAX ((s8)(U8_MAX>>1)) | |
34 | #define S8_MIN ((s8)(-S8_MAX - 1)) | |
35 | #define U16_MAX ((u16)~0U) | |
36 | #define S16_MAX ((s16)(U16_MAX>>1)) | |
37 | #define S16_MIN ((s16)(-S16_MAX - 1)) | |
38 | #define U32_MAX ((u32)~0U) | |
39 | #define S32_MAX ((s32)(U32_MAX>>1)) | |
40 | #define S32_MIN ((s32)(-S32_MAX - 1)) | |
41 | #define U64_MAX ((u64)~0ULL) | |
42 | #define S64_MAX ((s64)(U64_MAX>>1)) | |
43 | #define S64_MIN ((s64)(-S64_MAX - 1)) | |
44 | ||
1da177e4 LT |
45 | #define STACK_MAGIC 0xdeadbeef |
46 | ||
44696908 DM |
47 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
48 | ||
3ca45a46 | 49 | /* @a is a power of 2 value */ |
a79ff731 | 50 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
ed067d4a | 51 | #define ALIGN_DOWN(x, a) __ALIGN_KERNEL((x) - ((a) - 1), (a)) |
9f93ff5b | 52 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
a83308e6 | 53 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 54 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 55 | |
d3849953 CH |
56 | /* generic data direction definitions */ |
57 | #define READ 0 | |
58 | #define WRITE 1 | |
59 | ||
c5e631cf RR |
60 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
61 | ||
3ed605bc GP |
62 | #define u64_to_user_ptr(x) ( \ |
63 | { \ | |
64 | typecheck(u64, x); \ | |
65 | (void __user *)(uintptr_t)x; \ | |
66 | } \ | |
67 | ) | |
68 | ||
9b3be9f9 YL |
69 | /* |
70 | * This looks more complex than it should be. But we need to | |
71 | * get the type for the ~ right in round_down (it needs to be | |
72 | * as wide as the result!), and we want to evaluate the macro | |
73 | * arguments just once each. | |
74 | */ | |
75 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | |
76 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | |
77 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | |
78 | ||
4552d5dc | 79 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
b5d3755a | 80 | #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP |
36a26c69 NB |
81 | #define DIV_ROUND_UP_ULL(ll,d) \ |
82 | ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) | |
83 | ||
84 | #if BITS_PER_LONG == 32 | |
85 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) | |
86 | #else | |
87 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) | |
88 | #endif | |
074e61ec JM |
89 | |
90 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | |
b28efd54 EP |
91 | #define roundup(x, y) ( \ |
92 | { \ | |
6070bf35 | 93 | const typeof(y) __y = y; \ |
b28efd54 EP |
94 | (((x) + (__y - 1)) / __y) * __y; \ |
95 | } \ | |
96 | ) | |
686a0f3d EP |
97 | #define rounddown(x, y) ( \ |
98 | { \ | |
99 | typeof(x) __x = (x); \ | |
100 | __x - (__x % (y)); \ | |
101 | } \ | |
102 | ) | |
b6d86d3d GR |
103 | |
104 | /* | |
4f5901f5 NS |
105 | * Divide positive or negative dividend by positive or negative divisor |
106 | * and round to closest integer. Result is undefined for negative | |
107 | * divisors if he dividend variable type is unsigned and for negative | |
108 | * dividends if the divisor variable type is unsigned. | |
b6d86d3d | 109 | */ |
9fe06081 DW |
110 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
111 | { \ | |
b6d86d3d GR |
112 | typeof(x) __x = x; \ |
113 | typeof(divisor) __d = divisor; \ | |
c4e18497 | 114 | (((typeof(x))-1) > 0 || \ |
4f5901f5 NS |
115 | ((typeof(divisor))-1) > 0 || \ |
116 | (((__x) > 0) == ((__d) > 0))) ? \ | |
b6d86d3d GR |
117 | (((__x) + ((__d) / 2)) / (__d)) : \ |
118 | (((__x) - ((__d) / 2)) / (__d)); \ | |
9fe06081 DW |
119 | } \ |
120 | ) | |
f766093e JM |
121 | /* |
122 | * Same as above but for u64 dividends. divisor must be a 32-bit | |
123 | * number. | |
124 | */ | |
125 | #define DIV_ROUND_CLOSEST_ULL(x, divisor)( \ | |
126 | { \ | |
127 | typeof(divisor) __d = divisor; \ | |
128 | unsigned long long _tmp = (x) + (__d) / 2; \ | |
129 | do_div(_tmp, __d); \ | |
130 | _tmp; \ | |
131 | } \ | |
132 | ) | |
1da177e4 | 133 | |
9993bc63 SQ |
134 | /* |
135 | * Multiplies an integer by a fraction, while avoiding unnecessary | |
136 | * overflow or loss of precision. | |
137 | */ | |
138 | #define mult_frac(x, numer, denom)( \ | |
139 | { \ | |
140 | typeof(x) quot = (x) / (denom); \ | |
141 | typeof(x) rem = (x) % (denom); \ | |
142 | (quot * (numer)) + ((rem * (numer)) / (denom)); \ | |
143 | } \ | |
144 | ) | |
145 | ||
146 | ||
ca31e146 EGM |
147 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
148 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
149 | ||
90c699a9 | 150 | #ifdef CONFIG_LBDAF |
2da96acd JA |
151 | # include <asm/div64.h> |
152 | # define sector_div(a, b) do_div(a, b) | |
153 | #else | |
154 | # define sector_div(n, b)( \ | |
155 | { \ | |
156 | int _res; \ | |
157 | _res = (n) % (b); \ | |
158 | (n) /= (b); \ | |
159 | _res; \ | |
160 | } \ | |
161 | ) | |
162 | #endif | |
163 | ||
218e180e AM |
164 | /** |
165 | * upper_32_bits - return bits 32-63 of a number | |
166 | * @n: the number we're accessing | |
167 | * | |
168 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
169 | * the "right shift count >= width of type" warning when that quantity is | |
170 | * 32-bits. | |
171 | */ | |
172 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
173 | ||
204b885e JR |
174 | /** |
175 | * lower_32_bits - return bits 0-31 of a number | |
176 | * @n: the number we're accessing | |
177 | */ | |
178 | #define lower_32_bits(n) ((u32)(n)) | |
179 | ||
1da177e4 | 180 | struct completion; |
df2e71fb | 181 | struct pt_regs; |
182 | struct user; | |
1da177e4 | 183 | |
070cb065 UKK |
184 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
185 | extern int _cond_resched(void); | |
186 | # define might_resched() _cond_resched() | |
187 | #else | |
188 | # define might_resched() do { } while (0) | |
189 | #endif | |
190 | ||
d902db1e | 191 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
3427445a | 192 | void ___might_sleep(const char *file, int line, int preempt_offset); |
d894837f | 193 | void __might_sleep(const char *file, int line, int preempt_offset); |
1da177e4 LT |
194 | /** |
195 | * might_sleep - annotation for functions that can sleep | |
196 | * | |
197 | * this macro will print a stack trace if it is executed in an atomic | |
198 | * context (spinlock, irq-handler, ...). | |
199 | * | |
200 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 201 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
202 | * supposed to. |
203 | */ | |
f8cbd99b | 204 | # define might_sleep() \ |
e4aafea2 | 205 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
00845eb9 | 206 | # define sched_annotate_sleep() (current->task_state_change = 0) |
1da177e4 | 207 | #else |
3427445a PZ |
208 | static inline void ___might_sleep(const char *file, int line, |
209 | int preempt_offset) { } | |
d894837f SK |
210 | static inline void __might_sleep(const char *file, int line, |
211 | int preempt_offset) { } | |
f8cbd99b | 212 | # define might_sleep() do { might_resched(); } while (0) |
1029a2b5 | 213 | # define sched_annotate_sleep() do { } while (0) |
1da177e4 LT |
214 | #endif |
215 | ||
368a5fa1 | 216 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 217 | |
c8299cb6 MN |
218 | /** |
219 | * abs - return absolute value of an argument | |
8f57e4d9 MN |
220 | * @x: the value. If it is unsigned type, it is converted to signed type first. |
221 | * char is treated as if it was signed (regardless of whether it really is) | |
222 | * but the macro's return type is preserved as char. | |
c8299cb6 | 223 | * |
8f57e4d9 | 224 | * Return: an absolute value of x. |
71a90484 | 225 | */ |
8f57e4d9 MN |
226 | #define abs(x) __abs_choose_expr(x, long long, \ |
227 | __abs_choose_expr(x, long, \ | |
228 | __abs_choose_expr(x, int, \ | |
229 | __abs_choose_expr(x, short, \ | |
230 | __abs_choose_expr(x, char, \ | |
231 | __builtin_choose_expr( \ | |
232 | __builtin_types_compatible_p(typeof(x), char), \ | |
233 | (char)({ signed char __x = (x); __x<0?-__x:__x; }), \ | |
234 | ((void)0))))))) | |
235 | ||
236 | #define __abs_choose_expr(x, type, other) __builtin_choose_expr( \ | |
237 | __builtin_types_compatible_p(typeof(x), signed type) || \ | |
238 | __builtin_types_compatible_p(typeof(x), unsigned type), \ | |
239 | ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other) | |
c8299cb6 | 240 | |
89770b0a DB |
241 | /** |
242 | * reciprocal_scale - "scale" a value into range [0, ep_ro) | |
243 | * @val: value | |
244 | * @ep_ro: right open interval endpoint | |
245 | * | |
246 | * Perform a "reciprocal multiplication" in order to "scale" a value into | |
247 | * range [0, ep_ro), where the upper interval endpoint is right-open. | |
248 | * This is useful, e.g. for accessing a index of an array containing | |
249 | * ep_ro elements, for example. Think of it as sort of modulus, only that | |
250 | * the result isn't that of modulo. ;) Note that if initial input is a | |
251 | * small value, then result will return 0. | |
252 | * | |
253 | * Return: a result based on val in interval [0, ep_ro). | |
254 | */ | |
255 | static inline u32 reciprocal_scale(u32 val, u32 ep_ro) | |
256 | { | |
257 | return (u32)(((u64) val * ep_ro) >> 32); | |
258 | } | |
259 | ||
386e7906 AL |
260 | #if defined(CONFIG_MMU) && \ |
261 | (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)) | |
9ec23531 DH |
262 | #define might_fault() __might_fault(__FILE__, __LINE__) |
263 | void __might_fault(const char *file, int line); | |
3ee1afa3 | 264 | #else |
662bbcb2 | 265 | static inline void might_fault(void) { } |
3ee1afa3 NP |
266 | #endif |
267 | ||
e041c683 | 268 | extern struct atomic_notifier_head panic_notifier_list; |
c7ff0d9c | 269 | extern long (*panic_blink)(int state); |
9402c95f | 270 | __printf(1, 2) |
9af6528e | 271 | void panic(const char *fmt, ...) __noreturn __cold; |
ebc41f20 | 272 | void nmi_panic(struct pt_regs *regs, const char *msg); |
dd287796 AM |
273 | extern void oops_enter(void); |
274 | extern void oops_exit(void); | |
863a6049 | 275 | void print_oops_end_marker(void); |
dd287796 | 276 | extern int oops_may_print(void); |
9af6528e PZ |
277 | void do_exit(long error_code) __noreturn; |
278 | void complete_and_exit(struct completion *, long) __noreturn; | |
33ee3b2e | 279 | |
99f9ef18 DH |
280 | #ifdef CONFIG_LOCK_DOWN_KERNEL |
281 | extern bool kernel_is_locked_down(void); | |
282 | #else | |
283 | static inline bool kernel_is_locked_down(void) | |
284 | { | |
285 | return false; | |
286 | } | |
287 | #endif | |
288 | ||
33ee3b2e AD |
289 | /* Internal, do not use. */ |
290 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); | |
291 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); | |
292 | ||
293 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); | |
294 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); | |
4c925d60 EZ |
295 | |
296 | /** | |
297 | * kstrtoul - convert a string to an unsigned long | |
298 | * @s: The start of the string. The string must be null-terminated, and may also | |
299 | * include a single newline before its terminating null. The first character | |
300 | * may also be a plus sign, but not a minus sign. | |
301 | * @base: The number base to use. The maximum supported base is 16. If base is | |
302 | * given as 0, then the base of the string is automatically detected with the | |
303 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
304 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
305 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
306 | * @res: Where to write the result of the conversion on success. | |
307 | * | |
308 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
309 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
310 | * be checked. | |
311 | */ | |
33ee3b2e AD |
312 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) |
313 | { | |
314 | /* | |
315 | * We want to shortcut function call, but | |
316 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. | |
317 | */ | |
318 | if (sizeof(unsigned long) == sizeof(unsigned long long) && | |
319 | __alignof__(unsigned long) == __alignof__(unsigned long long)) | |
320 | return kstrtoull(s, base, (unsigned long long *)res); | |
321 | else | |
322 | return _kstrtoul(s, base, res); | |
323 | } | |
324 | ||
4c925d60 EZ |
325 | /** |
326 | * kstrtol - convert a string to a long | |
327 | * @s: The start of the string. The string must be null-terminated, and may also | |
328 | * include a single newline before its terminating null. The first character | |
329 | * may also be a plus sign or a minus sign. | |
330 | * @base: The number base to use. The maximum supported base is 16. If base is | |
331 | * given as 0, then the base of the string is automatically detected with the | |
332 | * conventional semantics - If it begins with 0x the number will be parsed as a | |
333 | * hexadecimal (case insensitive), if it otherwise begins with 0, it will be | |
334 | * parsed as an octal number. Otherwise it will be parsed as a decimal. | |
335 | * @res: Where to write the result of the conversion on success. | |
336 | * | |
337 | * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. | |
338 | * Used as a replacement for the obsolete simple_strtoull. Return code must | |
339 | * be checked. | |
340 | */ | |
33ee3b2e AD |
341 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) |
342 | { | |
343 | /* | |
344 | * We want to shortcut function call, but | |
345 | * __builtin_types_compatible_p(long, long long) = 0. | |
346 | */ | |
347 | if (sizeof(long) == sizeof(long long) && | |
348 | __alignof__(long) == __alignof__(long long)) | |
349 | return kstrtoll(s, base, (long long *)res); | |
350 | else | |
351 | return _kstrtol(s, base, res); | |
352 | } | |
353 | ||
354 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); | |
355 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); | |
356 | ||
357 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) | |
358 | { | |
359 | return kstrtoull(s, base, res); | |
360 | } | |
361 | ||
362 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) | |
363 | { | |
364 | return kstrtoll(s, base, res); | |
365 | } | |
366 | ||
367 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) | |
368 | { | |
369 | return kstrtouint(s, base, res); | |
370 | } | |
371 | ||
372 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) | |
373 | { | |
374 | return kstrtoint(s, base, res); | |
375 | } | |
376 | ||
377 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); | |
378 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); | |
379 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); | |
380 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); | |
ef951599 | 381 | int __must_check kstrtobool(const char *s, bool *res); |
33ee3b2e | 382 | |
c196e32a AD |
383 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); |
384 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); | |
385 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); | |
386 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); | |
387 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); | |
388 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); | |
389 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); | |
390 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); | |
391 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); | |
392 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); | |
ef951599 | 393 | int __must_check kstrtobool_from_user(const char __user *s, size_t count, bool *res); |
c196e32a AD |
394 | |
395 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) | |
396 | { | |
397 | return kstrtoull_from_user(s, count, base, res); | |
398 | } | |
399 | ||
400 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) | |
401 | { | |
402 | return kstrtoll_from_user(s, count, base, res); | |
403 | } | |
404 | ||
405 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) | |
406 | { | |
407 | return kstrtouint_from_user(s, count, base, res); | |
408 | } | |
409 | ||
410 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) | |
411 | { | |
412 | return kstrtoint_from_user(s, count, base, res); | |
413 | } | |
414 | ||
67d0a075 JP |
415 | /* Obsolete, do not use. Use kstrto<foo> instead */ |
416 | ||
1da177e4 LT |
417 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
418 | extern long simple_strtol(const char *,char **,unsigned int); | |
419 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
420 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
33ee3b2e | 421 | |
1ac101a5 KH |
422 | extern int num_to_str(char *buf, int size, unsigned long long num); |
423 | ||
67d0a075 JP |
424 | /* lib/printf utilities */ |
425 | ||
b9075fa9 JP |
426 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
427 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | |
428 | extern __printf(3, 4) | |
429 | int snprintf(char *buf, size_t size, const char *fmt, ...); | |
430 | extern __printf(3, 0) | |
431 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
432 | extern __printf(3, 4) | |
433 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | |
434 | extern __printf(3, 0) | |
435 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
48a27055 | 436 | extern __printf(2, 3) __malloc |
b9075fa9 | 437 | char *kasprintf(gfp_t gfp, const char *fmt, ...); |
48a27055 | 438 | extern __printf(2, 0) __malloc |
8db14860 | 439 | char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
0a9df786 RV |
440 | extern __printf(2, 0) |
441 | const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args); | |
1da177e4 | 442 | |
6061d949 JP |
443 | extern __scanf(2, 3) |
444 | int sscanf(const char *, const char *, ...); | |
445 | extern __scanf(2, 0) | |
446 | int vsscanf(const char *, const char *, va_list); | |
1da177e4 LT |
447 | |
448 | extern int get_option(char **str, int *pint); | |
449 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 450 | extern unsigned long long memparse(const char *ptr, char **retptr); |
6ccc72b8 | 451 | extern bool parse_option_str(const char *str, const char *option); |
f51b17c8 | 452 | extern char *next_arg(char *args, char **param, char **val); |
1da177e4 | 453 | |
5e376613 | 454 | extern int core_kernel_text(unsigned long addr); |
cdbe61bf | 455 | extern int core_kernel_data(unsigned long addr); |
1da177e4 LT |
456 | extern int __kernel_text_address(unsigned long addr); |
457 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 458 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 459 | |
1da177e4 LT |
460 | unsigned long int_sqrt(unsigned long); |
461 | ||
1da177e4 LT |
462 | extern void bust_spinlocks(int yes); |
463 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ | |
aa727107 | 464 | extern int panic_timeout; |
1da177e4 | 465 | extern int panic_on_oops; |
8da5adda | 466 | extern int panic_on_unrecovered_nmi; |
5211a242 | 467 | extern int panic_on_io_nmi; |
9e3961a0 | 468 | extern int panic_on_warn; |
088e9d25 | 469 | extern int sysctl_panic_on_rcu_stall; |
55af7796 | 470 | extern int sysctl_panic_on_stackoverflow; |
5375b708 HD |
471 | |
472 | extern bool crash_kexec_post_notifiers; | |
473 | ||
1717f209 HK |
474 | /* |
475 | * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It | |
476 | * holds a CPU number which is executing panic() currently. A value of | |
477 | * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec(). | |
478 | */ | |
479 | extern atomic_t panic_cpu; | |
480 | #define PANIC_CPU_INVALID -1 | |
481 | ||
5800dc3c JB |
482 | /* |
483 | * Only to be used by arch init code. If the user over-wrote the default | |
484 | * CONFIG_PANIC_TIMEOUT, honor it. | |
485 | */ | |
486 | static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout) | |
487 | { | |
488 | if (panic_timeout == arch_default_timeout) | |
489 | panic_timeout = timeout; | |
490 | } | |
1da177e4 | 491 | extern const char *print_tainted(void); |
373d4d09 RR |
492 | enum lockdep_ok { |
493 | LOCKDEP_STILL_OK, | |
494 | LOCKDEP_NOW_UNRELIABLE | |
495 | }; | |
496 | extern void add_taint(unsigned flag, enum lockdep_ok); | |
25ddbb18 AK |
497 | extern int test_taint(unsigned flag); |
498 | extern unsigned long get_taint(void); | |
b920de1b | 499 | extern int root_mountflags; |
1da177e4 | 500 | |
2ce802f6 TH |
501 | extern bool early_boot_irqs_disabled; |
502 | ||
69a78ff2 TG |
503 | /* |
504 | * Values used for system_state. Ordering of the states must not be changed | |
505 | * as code checks for <, <=, >, >= STATE. | |
506 | */ | |
1da177e4 LT |
507 | extern enum system_states { |
508 | SYSTEM_BOOTING, | |
69a78ff2 | 509 | SYSTEM_SCHEDULING, |
1da177e4 LT |
510 | SYSTEM_RUNNING, |
511 | SYSTEM_HALT, | |
512 | SYSTEM_POWER_OFF, | |
513 | SYSTEM_RESTART, | |
514 | } system_state; | |
515 | ||
25ddbb18 AK |
516 | #define TAINT_PROPRIETARY_MODULE 0 |
517 | #define TAINT_FORCED_MODULE 1 | |
8c90487c | 518 | #define TAINT_CPU_OUT_OF_SPEC 2 |
25ddbb18 AK |
519 | #define TAINT_FORCED_RMMOD 3 |
520 | #define TAINT_MACHINE_CHECK 4 | |
521 | #define TAINT_BAD_PAGE 5 | |
522 | #define TAINT_USER 6 | |
523 | #define TAINT_DIE 7 | |
524 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
525 | #define TAINT_WARN 9 | |
26e9a397 | 526 | #define TAINT_CRAP 10 |
92946bc7 | 527 | #define TAINT_FIRMWARE_WORKAROUND 11 |
2449b8ba | 528 | #define TAINT_OOT_MODULE 12 |
66cc69e3 | 529 | #define TAINT_UNSIGNED_MODULE 13 |
69361eef | 530 | #define TAINT_SOFTLOCKUP 14 |
c5f45465 | 531 | #define TAINT_LIVEPATCH 15 |
7fd8329b PM |
532 | #define TAINT_FLAGS_COUNT 16 |
533 | ||
534 | struct taint_flag { | |
5eb7c0d0 LF |
535 | char c_true; /* character printed when tainted */ |
536 | char c_false; /* character printed when not tainted */ | |
7fd8329b PM |
537 | bool module; /* also show as a per-module taint flag */ |
538 | }; | |
539 | ||
540 | extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT]; | |
1da177e4 | 541 | |
3fc95772 HH |
542 | extern const char hex_asc[]; |
543 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
544 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
545 | ||
55036ba7 | 546 | static inline char *hex_byte_pack(char *buf, u8 byte) |
3fc95772 HH |
547 | { |
548 | *buf++ = hex_asc_hi(byte); | |
549 | *buf++ = hex_asc_lo(byte); | |
550 | return buf; | |
551 | } | |
99eaf3c4 | 552 | |
c26d436c AN |
553 | extern const char hex_asc_upper[]; |
554 | #define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)] | |
555 | #define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4] | |
556 | ||
557 | static inline char *hex_byte_pack_upper(char *buf, u8 byte) | |
558 | { | |
559 | *buf++ = hex_asc_upper_hi(byte); | |
560 | *buf++ = hex_asc_upper_lo(byte); | |
561 | return buf; | |
562 | } | |
563 | ||
90378889 | 564 | extern int hex_to_bin(char ch); |
b7804983 | 565 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
53d91c5c | 566 | extern char *bin2hex(char *dst, const void *src, size_t count); |
90378889 | 567 | |
a69f5edb | 568 | bool mac_pton(const char *s, u8 *mac); |
4cd5773a | 569 | |
526211bc IM |
570 | /* |
571 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
572 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
573 | * | |
574 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
575 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 576 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
577 | * file, which gives a means for the kernel and userspace to interact. |
578 | * Place a tracing_off() in the kernel where you want tracing to end. | |
579 | * From user space, examine the trace, and then echo 1 > tracing_on | |
580 | * to continue tracing. | |
581 | * | |
582 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
583 | * by things like suspend to ram where disabling the recording of the | |
584 | * trace is not enough, but tracing must actually stop because things | |
585 | * like calling smp_processor_id() may crash the system. | |
586 | * | |
587 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 588 | */ |
cecbca96 FW |
589 | |
590 | enum ftrace_dump_mode { | |
591 | DUMP_NONE, | |
592 | DUMP_ALL, | |
593 | DUMP_ORIG, | |
594 | }; | |
595 | ||
526211bc | 596 | #ifdef CONFIG_TRACING |
93d68e52 SR |
597 | void tracing_on(void); |
598 | void tracing_off(void); | |
599 | int tracing_is_on(void); | |
ad909e21 SRRH |
600 | void tracing_snapshot(void); |
601 | void tracing_snapshot_alloc(void); | |
93d68e52 | 602 | |
526211bc IM |
603 | extern void tracing_start(void); |
604 | extern void tracing_stop(void); | |
526211bc | 605 | |
b9075fa9 JP |
606 | static inline __printf(1, 2) |
607 | void ____trace_printk_check_format(const char *fmt, ...) | |
769b0441 FW |
608 | { |
609 | } | |
610 | #define __trace_printk_check_format(fmt, args...) \ | |
611 | do { \ | |
612 | if (0) \ | |
613 | ____trace_printk_check_format(fmt, ##args); \ | |
614 | } while (0) | |
615 | ||
526211bc IM |
616 | /** |
617 | * trace_printk - printf formatting in the ftrace buffer | |
618 | * @fmt: the printf format for printing | |
619 | * | |
620 | * Note: __trace_printk is an internal function for trace_printk and | |
621 | * the @ip is passed in via the trace_printk macro. | |
622 | * | |
623 | * This function allows a kernel developer to debug fast path sections | |
624 | * that printk is not appropriate for. By scattering in various | |
625 | * printk like tracing in the code, a developer can quickly see | |
626 | * where problems are occurring. | |
627 | * | |
628 | * This is intended as a debugging tool for the developer only. | |
629 | * Please refrain from leaving trace_printks scattered around in | |
09ae7234 SRRH |
630 | * your code. (Extra memory is used for special buffers that are |
631 | * allocated when trace_printk() is used) | |
9d3c752c SRRH |
632 | * |
633 | * A little optization trick is done here. If there's only one | |
634 | * argument, there's no need to scan the string for printf formats. | |
635 | * The trace_puts() will suffice. But how can we take advantage of | |
636 | * using trace_puts() when trace_printk() has only one argument? | |
637 | * By stringifying the args and checking the size we can tell | |
638 | * whether or not there are args. __stringify((__VA_ARGS__)) will | |
639 | * turn into "()\0" with a size of 3 when there are no args, anything | |
640 | * else will be bigger. All we need to do is define a string to this, | |
641 | * and then take its size and compare to 3. If it's bigger, use | |
642 | * do_trace_printk() otherwise, optimize it to trace_puts(). Then just | |
643 | * let gcc optimize the rest. | |
526211bc | 644 | */ |
769b0441 | 645 | |
9d3c752c SRRH |
646 | #define trace_printk(fmt, ...) \ |
647 | do { \ | |
648 | char _______STR[] = __stringify((__VA_ARGS__)); \ | |
649 | if (sizeof(_______STR) > 3) \ | |
650 | do_trace_printk(fmt, ##__VA_ARGS__); \ | |
651 | else \ | |
652 | trace_puts(fmt); \ | |
653 | } while (0) | |
654 | ||
655 | #define do_trace_printk(fmt, args...) \ | |
769b0441 | 656 | do { \ |
3debb0a9 | 657 | static const char *trace_printk_fmt __used \ |
07d777fe SR |
658 | __attribute__((section("__trace_printk_fmt"))) = \ |
659 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
660 | \ | |
769b0441 | 661 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 | 662 | \ |
07d777fe | 663 | if (__builtin_constant_p(fmt)) \ |
48ead020 | 664 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
07d777fe SR |
665 | else \ |
666 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
667 | } while (0) |
668 | ||
b9075fa9 JP |
669 | extern __printf(2, 3) |
670 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | |
48ead020 | 671 | |
b9075fa9 JP |
672 | extern __printf(2, 3) |
673 | int __trace_printk(unsigned long ip, const char *fmt, ...); | |
769b0441 | 674 | |
09ae7234 SRRH |
675 | /** |
676 | * trace_puts - write a string into the ftrace buffer | |
677 | * @str: the string to record | |
678 | * | |
679 | * Note: __trace_bputs is an internal function for trace_puts and | |
680 | * the @ip is passed in via the trace_puts macro. | |
681 | * | |
682 | * This is similar to trace_printk() but is made for those really fast | |
683 | * paths that a developer wants the least amount of "Heisenbug" affects, | |
684 | * where the processing of the print format is still too much. | |
685 | * | |
686 | * This function allows a kernel developer to debug fast path sections | |
687 | * that printk is not appropriate for. By scattering in various | |
688 | * printk like tracing in the code, a developer can quickly see | |
689 | * where problems are occurring. | |
690 | * | |
691 | * This is intended as a debugging tool for the developer only. | |
692 | * Please refrain from leaving trace_puts scattered around in | |
693 | * your code. (Extra memory is used for special buffers that are | |
694 | * allocated when trace_puts() is used) | |
695 | * | |
696 | * Returns: 0 if nothing was written, positive # if string was. | |
697 | * (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) | |
698 | */ | |
699 | ||
09ae7234 | 700 | #define trace_puts(str) ({ \ |
3debb0a9 | 701 | static const char *trace_printk_fmt __used \ |
09ae7234 SRRH |
702 | __attribute__((section("__trace_printk_fmt"))) = \ |
703 | __builtin_constant_p(str) ? str : NULL; \ | |
704 | \ | |
705 | if (__builtin_constant_p(str)) \ | |
706 | __trace_bputs(_THIS_IP_, trace_printk_fmt); \ | |
707 | else \ | |
708 | __trace_puts(_THIS_IP_, str, strlen(str)); \ | |
709 | }) | |
bcf312cf SR |
710 | extern int __trace_bputs(unsigned long ip, const char *str); |
711 | extern int __trace_puts(unsigned long ip, const char *str, int size); | |
09ae7234 | 712 | |
c142be8e | 713 | extern void trace_dump_stack(int skip); |
03889384 | 714 | |
48ead020 FW |
715 | /* |
716 | * The double __builtin_constant_p is because gcc will give us an error | |
717 | * if we try to allocate the static variable to fmt if it is not a | |
718 | * constant. Even with the outer if statement. | |
719 | */ | |
769b0441 FW |
720 | #define ftrace_vprintk(fmt, vargs) \ |
721 | do { \ | |
48ead020 | 722 | if (__builtin_constant_p(fmt)) { \ |
3debb0a9 | 723 | static const char *trace_printk_fmt __used \ |
48ead020 FW |
724 | __attribute__((section("__trace_printk_fmt"))) = \ |
725 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 726 | \ |
48ead020 FW |
727 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
728 | } else \ | |
729 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
730 | } while (0) |
731 | ||
8db14860 | 732 | extern __printf(2, 0) int |
48ead020 FW |
733 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
734 | ||
8db14860 | 735 | extern __printf(2, 0) int |
526211bc | 736 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
769b0441 | 737 | |
cecbca96 | 738 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 739 | #else |
526211bc IM |
740 | static inline void tracing_start(void) { } |
741 | static inline void tracing_stop(void) { } | |
e67bc51e | 742 | static inline void trace_dump_stack(int skip) { } |
93d68e52 SR |
743 | |
744 | static inline void tracing_on(void) { } | |
745 | static inline void tracing_off(void) { } | |
746 | static inline int tracing_is_on(void) { return 0; } | |
ad909e21 SRRH |
747 | static inline void tracing_snapshot(void) { } |
748 | static inline void tracing_snapshot_alloc(void) { } | |
93d68e52 | 749 | |
60efc15a MH |
750 | static inline __printf(1, 2) |
751 | int trace_printk(const char *fmt, ...) | |
526211bc IM |
752 | { |
753 | return 0; | |
754 | } | |
8db14860 | 755 | static __printf(1, 0) inline int |
526211bc IM |
756 | ftrace_vprintk(const char *fmt, va_list ap) |
757 | { | |
758 | return 0; | |
759 | } | |
cecbca96 | 760 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 761 | #endif /* CONFIG_TRACING */ |
526211bc | 762 | |
1da177e4 | 763 | /* |
bdf4bbaa | 764 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
765 | * strict type-checking.. See the |
766 | * "unnecessary" pointer comparison. | |
767 | */ | |
589a9785 JB |
768 | #define __min(t1, t2, min1, min2, x, y) ({ \ |
769 | t1 min1 = (x); \ | |
770 | t2 min2 = (y); \ | |
771 | (void) (&min1 == &min2); \ | |
772 | min1 < min2 ? min1 : min2; }) | |
773 | #define min(x, y) \ | |
774 | __min(typeof(x), typeof(y), \ | |
775 | __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ | |
776 | x, y) | |
777 | ||
778 | #define __max(t1, t2, max1, max2, x, y) ({ \ | |
779 | t1 max1 = (x); \ | |
780 | t2 max2 = (y); \ | |
781 | (void) (&max1 == &max2); \ | |
782 | max1 > max2 ? max1 : max2; }) | |
783 | #define max(x, y) \ | |
784 | __max(typeof(x), typeof(y), \ | |
785 | __UNIQUE_ID(max1_), __UNIQUE_ID(max2_), \ | |
786 | x, y) | |
bdf4bbaa | 787 | |
2e1d06e1 MN |
788 | #define min3(x, y, z) min((typeof(x))min(x, y), z) |
789 | #define max3(x, y, z) max((typeof(x))max(x, y), z) | |
f27c85c5 | 790 | |
c8bf1336 MP |
791 | /** |
792 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero | |
793 | * @x: value1 | |
794 | * @y: value2 | |
795 | */ | |
796 | #define min_not_zero(x, y) ({ \ | |
797 | typeof(x) __x = (x); \ | |
798 | typeof(y) __y = (y); \ | |
799 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | |
800 | ||
bdf4bbaa HH |
801 | /** |
802 | * clamp - return a value clamped to a given range with strict typechecking | |
803 | * @val: current value | |
2e1d06e1 MN |
804 | * @lo: lowest allowable value |
805 | * @hi: highest allowable value | |
bdf4bbaa | 806 | * |
c185b07f | 807 | * This macro does strict typechecking of lo/hi to make sure they are of the |
bdf4bbaa HH |
808 | * same type as val. See the unnecessary pointer comparisons. |
809 | */ | |
2e1d06e1 | 810 | #define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi) |
1da177e4 LT |
811 | |
812 | /* | |
813 | * ..and if you can't take the strict | |
814 | * types, you can specify one yourself. | |
815 | * | |
bdf4bbaa HH |
816 | * Or not use min/max/clamp at all, of course. |
817 | */ | |
589a9785 JB |
818 | #define min_t(type, x, y) \ |
819 | __min(type, type, \ | |
820 | __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ | |
821 | x, y) | |
822 | ||
823 | #define max_t(type, x, y) \ | |
824 | __max(type, type, \ | |
825 | __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ | |
826 | x, y) | |
bdf4bbaa HH |
827 | |
828 | /** | |
829 | * clamp_t - return a value clamped to a given range using a given type | |
830 | * @type: the type of variable to use | |
831 | * @val: current value | |
c185b07f MN |
832 | * @lo: minimum allowable value |
833 | * @hi: maximum allowable value | |
bdf4bbaa HH |
834 | * |
835 | * This macro does no typechecking and uses temporary variables of type | |
836 | * 'type' to make all the comparisons. | |
1da177e4 | 837 | */ |
c185b07f | 838 | #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) |
1da177e4 | 839 | |
bdf4bbaa HH |
840 | /** |
841 | * clamp_val - return a value clamped to a given range using val's type | |
842 | * @val: current value | |
c185b07f MN |
843 | * @lo: minimum allowable value |
844 | * @hi: maximum allowable value | |
bdf4bbaa HH |
845 | * |
846 | * This macro does no typechecking and uses temporary variables of whatever | |
847 | * type the input argument 'val' is. This is useful when val is an unsigned | |
848 | * type and min and max are literals that will otherwise be assigned a signed | |
849 | * integer type. | |
850 | */ | |
c185b07f | 851 | #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) |
1da177e4 | 852 | |
91f68b73 WF |
853 | |
854 | /* | |
855 | * swap - swap value of @a and @b | |
856 | */ | |
ac7b9004 PZ |
857 | #define swap(a, b) \ |
858 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 859 | |
1da177e4 LT |
860 | /** |
861 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
862 | * @ptr: the pointer to the member. |
863 | * @type: the type of the container struct this is embedded in. | |
864 | * @member: the name of the member within the struct. | |
865 | * | |
866 | */ | |
c7acec71 IA |
867 | #define container_of(ptr, type, member) ({ \ |
868 | void *__mptr = (void *)(ptr); \ | |
869 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ | |
870 | !__same_type(*(ptr), void), \ | |
871 | "pointer type mismatch in container_of()"); \ | |
872 | ((type *)(__mptr - offsetof(type, member))); }) | |
1da177e4 | 873 | |
b9d4f426 AL |
874 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
875 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
876 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
877 | #endif | |
9d00f92f | 878 | |
58f86cc8 | 879 | /* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ |
28b8d0c8 GCM |
880 | #define VERIFY_OCTAL_PERMISSIONS(perms) \ |
881 | (BUILD_BUG_ON_ZERO((perms) < 0) + \ | |
882 | BUILD_BUG_ON_ZERO((perms) > 0777) + \ | |
883 | /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ | |
884 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ | |
885 | BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ | |
886 | /* USER_WRITABLE >= GROUP_WRITABLE */ \ | |
887 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ | |
888 | /* OTHER_WRITABLE? Generally considered a bad idea. */ \ | |
889 | BUILD_BUG_ON_ZERO((perms) & 2) + \ | |
58f86cc8 | 890 | (perms)) |
1da177e4 | 891 | #endif |