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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_KERNEL_H |
2 | #define _LINUX_KERNEL_H | |
3 | ||
d8e5ddef PA |
4 | #include <linux/sysinfo.h> |
5 | ||
1da177e4 LT |
6 | /* |
7 | * 'kernel.h' contains some often-used function prototypes etc | |
8 | */ | |
a79ff731 AD |
9 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) |
10 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) | |
1da177e4 LT |
11 | |
12 | #ifdef __KERNEL__ | |
13 | ||
14 | #include <stdarg.h> | |
15 | #include <linux/linkage.h> | |
16 | #include <linux/stddef.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/compiler.h> | |
19 | #include <linux/bitops.h> | |
f0d1b0b3 | 20 | #include <linux/log2.h> |
e0deaff4 | 21 | #include <linux/typecheck.h> |
968ab183 | 22 | #include <linux/printk.h> |
e9d376f0 | 23 | #include <linux/dynamic_debug.h> |
1da177e4 | 24 | #include <asm/byteorder.h> |
1da177e4 | 25 | |
4be929be AD |
26 | #define USHRT_MAX ((u16)(~0U)) |
27 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) | |
28 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) | |
1da177e4 LT |
29 | #define INT_MAX ((int)(~0U>>1)) |
30 | #define INT_MIN (-INT_MAX - 1) | |
31 | #define UINT_MAX (~0U) | |
32 | #define LONG_MAX ((long)(~0UL>>1)) | |
33 | #define LONG_MIN (-LONG_MAX - 1) | |
34 | #define ULONG_MAX (~0UL) | |
111ebb6e OH |
35 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
36 | #define LLONG_MIN (-LLONG_MAX - 1) | |
37 | #define ULLONG_MAX (~0ULL) | |
1da177e4 LT |
38 | |
39 | #define STACK_MAGIC 0xdeadbeef | |
40 | ||
a79ff731 | 41 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
9f93ff5b | 42 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
a83308e6 | 43 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 44 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 45 | |
c5e631cf RR |
46 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
47 | ||
9b3be9f9 YL |
48 | /* |
49 | * This looks more complex than it should be. But we need to | |
50 | * get the type for the ~ right in round_down (it needs to be | |
51 | * as wide as the result!), and we want to evaluate the macro | |
52 | * arguments just once each. | |
53 | */ | |
54 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | |
55 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | |
56 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | |
57 | ||
4552d5dc | 58 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
930631ed | 59 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
36a26c69 NB |
60 | #define DIV_ROUND_UP_ULL(ll,d) \ |
61 | ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) | |
62 | ||
63 | #if BITS_PER_LONG == 32 | |
64 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) | |
65 | #else | |
66 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) | |
67 | #endif | |
074e61ec JM |
68 | |
69 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | |
b28efd54 EP |
70 | #define roundup(x, y) ( \ |
71 | { \ | |
6070bf35 | 72 | const typeof(y) __y = y; \ |
b28efd54 EP |
73 | (((x) + (__y - 1)) / __y) * __y; \ |
74 | } \ | |
75 | ) | |
686a0f3d EP |
76 | #define rounddown(x, y) ( \ |
77 | { \ | |
78 | typeof(x) __x = (x); \ | |
79 | __x - (__x % (y)); \ | |
80 | } \ | |
81 | ) | |
9fe06081 DW |
82 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
83 | { \ | |
84 | typeof(divisor) __divisor = divisor; \ | |
85 | (((x) + ((__divisor) / 2)) / (__divisor)); \ | |
86 | } \ | |
87 | ) | |
1da177e4 | 88 | |
9993bc63 SQ |
89 | /* |
90 | * Multiplies an integer by a fraction, while avoiding unnecessary | |
91 | * overflow or loss of precision. | |
92 | */ | |
93 | #define mult_frac(x, numer, denom)( \ | |
94 | { \ | |
95 | typeof(x) quot = (x) / (denom); \ | |
96 | typeof(x) rem = (x) % (denom); \ | |
97 | (quot * (numer)) + ((rem * (numer)) / (denom)); \ | |
98 | } \ | |
99 | ) | |
100 | ||
101 | ||
ca31e146 EGM |
102 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
103 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
104 | ||
90c699a9 | 105 | #ifdef CONFIG_LBDAF |
2da96acd JA |
106 | # include <asm/div64.h> |
107 | # define sector_div(a, b) do_div(a, b) | |
108 | #else | |
109 | # define sector_div(n, b)( \ | |
110 | { \ | |
111 | int _res; \ | |
112 | _res = (n) % (b); \ | |
113 | (n) /= (b); \ | |
114 | _res; \ | |
115 | } \ | |
116 | ) | |
117 | #endif | |
118 | ||
218e180e AM |
119 | /** |
120 | * upper_32_bits - return bits 32-63 of a number | |
121 | * @n: the number we're accessing | |
122 | * | |
123 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
124 | * the "right shift count >= width of type" warning when that quantity is | |
125 | * 32-bits. | |
126 | */ | |
127 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
128 | ||
204b885e JR |
129 | /** |
130 | * lower_32_bits - return bits 0-31 of a number | |
131 | * @n: the number we're accessing | |
132 | */ | |
133 | #define lower_32_bits(n) ((u32)(n)) | |
134 | ||
1da177e4 | 135 | struct completion; |
df2e71fb | 136 | struct pt_regs; |
137 | struct user; | |
1da177e4 | 138 | |
070cb065 UKK |
139 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
140 | extern int _cond_resched(void); | |
141 | # define might_resched() _cond_resched() | |
142 | #else | |
143 | # define might_resched() do { } while (0) | |
144 | #endif | |
145 | ||
d902db1e | 146 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
d894837f | 147 | void __might_sleep(const char *file, int line, int preempt_offset); |
1da177e4 LT |
148 | /** |
149 | * might_sleep - annotation for functions that can sleep | |
150 | * | |
151 | * this macro will print a stack trace if it is executed in an atomic | |
152 | * context (spinlock, irq-handler, ...). | |
153 | * | |
154 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 155 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
156 | * supposed to. |
157 | */ | |
f8cbd99b | 158 | # define might_sleep() \ |
e4aafea2 | 159 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
1da177e4 | 160 | #else |
d894837f SK |
161 | static inline void __might_sleep(const char *file, int line, |
162 | int preempt_offset) { } | |
f8cbd99b | 163 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
164 | #endif |
165 | ||
368a5fa1 | 166 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 167 | |
71a90484 AM |
168 | /* |
169 | * abs() handles unsigned and signed longs, ints, shorts and chars. For all | |
170 | * input types abs() returns a signed long. | |
171 | * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() | |
172 | * for those. | |
173 | */ | |
174 | #define abs(x) ({ \ | |
175 | long ret; \ | |
176 | if (sizeof(x) == sizeof(long)) { \ | |
177 | long __x = (x); \ | |
178 | ret = (__x < 0) ? -__x : __x; \ | |
179 | } else { \ | |
180 | int __x = (x); \ | |
181 | ret = (__x < 0) ? -__x : __x; \ | |
182 | } \ | |
183 | ret; \ | |
1da177e4 LT |
184 | }) |
185 | ||
658716d1 BB |
186 | #define abs64(x) ({ \ |
187 | s64 __x = (x); \ | |
188 | (__x < 0) ? -__x : __x; \ | |
189 | }) | |
190 | ||
3ee1afa3 NP |
191 | #ifdef CONFIG_PROVE_LOCKING |
192 | void might_fault(void); | |
193 | #else | |
194 | static inline void might_fault(void) | |
195 | { | |
196 | might_sleep(); | |
197 | } | |
198 | #endif | |
199 | ||
e041c683 | 200 | extern struct atomic_notifier_head panic_notifier_list; |
c7ff0d9c | 201 | extern long (*panic_blink)(int state); |
9402c95f | 202 | __printf(1, 2) |
4da47859 | 203 | void panic(const char *fmt, ...) |
ff2d8b19 | 204 | __noreturn __cold; |
dd287796 AM |
205 | extern void oops_enter(void); |
206 | extern void oops_exit(void); | |
863a6049 | 207 | void print_oops_end_marker(void); |
dd287796 | 208 | extern int oops_may_print(void); |
9402c95f | 209 | void do_exit(long error_code) |
ff2d8b19 | 210 | __noreturn; |
9402c95f | 211 | void complete_and_exit(struct completion *, long) |
ff2d8b19 | 212 | __noreturn; |
33ee3b2e AD |
213 | |
214 | /* Internal, do not use. */ | |
215 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); | |
216 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); | |
217 | ||
218 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); | |
219 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); | |
220 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) | |
221 | { | |
222 | /* | |
223 | * We want to shortcut function call, but | |
224 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. | |
225 | */ | |
226 | if (sizeof(unsigned long) == sizeof(unsigned long long) && | |
227 | __alignof__(unsigned long) == __alignof__(unsigned long long)) | |
228 | return kstrtoull(s, base, (unsigned long long *)res); | |
229 | else | |
230 | return _kstrtoul(s, base, res); | |
231 | } | |
232 | ||
233 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) | |
234 | { | |
235 | /* | |
236 | * We want to shortcut function call, but | |
237 | * __builtin_types_compatible_p(long, long long) = 0. | |
238 | */ | |
239 | if (sizeof(long) == sizeof(long long) && | |
240 | __alignof__(long) == __alignof__(long long)) | |
241 | return kstrtoll(s, base, (long long *)res); | |
242 | else | |
243 | return _kstrtol(s, base, res); | |
244 | } | |
245 | ||
246 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); | |
247 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); | |
248 | ||
249 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) | |
250 | { | |
251 | return kstrtoull(s, base, res); | |
252 | } | |
253 | ||
254 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) | |
255 | { | |
256 | return kstrtoll(s, base, res); | |
257 | } | |
258 | ||
259 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) | |
260 | { | |
261 | return kstrtouint(s, base, res); | |
262 | } | |
263 | ||
264 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) | |
265 | { | |
266 | return kstrtoint(s, base, res); | |
267 | } | |
268 | ||
269 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); | |
270 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); | |
271 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); | |
272 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); | |
273 | ||
c196e32a AD |
274 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); |
275 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); | |
276 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); | |
277 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); | |
278 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); | |
279 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); | |
280 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); | |
281 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); | |
282 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); | |
283 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); | |
284 | ||
285 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) | |
286 | { | |
287 | return kstrtoull_from_user(s, count, base, res); | |
288 | } | |
289 | ||
290 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) | |
291 | { | |
292 | return kstrtoll_from_user(s, count, base, res); | |
293 | } | |
294 | ||
295 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) | |
296 | { | |
297 | return kstrtouint_from_user(s, count, base, res); | |
298 | } | |
299 | ||
300 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) | |
301 | { | |
302 | return kstrtoint_from_user(s, count, base, res); | |
303 | } | |
304 | ||
67d0a075 JP |
305 | /* Obsolete, do not use. Use kstrto<foo> instead */ |
306 | ||
1da177e4 LT |
307 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
308 | extern long simple_strtol(const char *,char **,unsigned int); | |
309 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
310 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
33ee3b2e AD |
311 | #define strict_strtoul kstrtoul |
312 | #define strict_strtol kstrtol | |
313 | #define strict_strtoull kstrtoull | |
314 | #define strict_strtoll kstrtoll | |
315 | ||
1ac101a5 KH |
316 | extern int num_to_str(char *buf, int size, unsigned long long num); |
317 | ||
67d0a075 JP |
318 | /* lib/printf utilities */ |
319 | ||
b9075fa9 JP |
320 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
321 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | |
322 | extern __printf(3, 4) | |
323 | int snprintf(char *buf, size_t size, const char *fmt, ...); | |
324 | extern __printf(3, 0) | |
325 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
326 | extern __printf(3, 4) | |
327 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | |
328 | extern __printf(3, 0) | |
329 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
330 | extern __printf(2, 3) | |
331 | char *kasprintf(gfp_t gfp, const char *fmt, ...); | |
11443ec7 | 332 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
1da177e4 | 333 | |
6061d949 JP |
334 | extern __scanf(2, 3) |
335 | int sscanf(const char *, const char *, ...); | |
336 | extern __scanf(2, 0) | |
337 | int vsscanf(const char *, const char *, va_list); | |
1da177e4 LT |
338 | |
339 | extern int get_option(char **str, int *pint); | |
340 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 341 | extern unsigned long long memparse(const char *ptr, char **retptr); |
1da177e4 | 342 | |
5e376613 | 343 | extern int core_kernel_text(unsigned long addr); |
cdbe61bf | 344 | extern int core_kernel_data(unsigned long addr); |
1da177e4 LT |
345 | extern int __kernel_text_address(unsigned long addr); |
346 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 347 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 348 | |
04a2e6a5 EB |
349 | struct pid; |
350 | extern struct pid *session_of_pgrp(struct pid *pgrp); | |
1da177e4 | 351 | |
1da177e4 LT |
352 | unsigned long int_sqrt(unsigned long); |
353 | ||
1da177e4 | 354 | extern void bust_spinlocks(int yes); |
e3e8a75d | 355 | extern void wake_up_klogd(void); |
1da177e4 | 356 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
aa727107 | 357 | extern int panic_timeout; |
1da177e4 | 358 | extern int panic_on_oops; |
8da5adda | 359 | extern int panic_on_unrecovered_nmi; |
5211a242 | 360 | extern int panic_on_io_nmi; |
55af7796 | 361 | extern int sysctl_panic_on_stackoverflow; |
1da177e4 | 362 | extern const char *print_tainted(void); |
25ddbb18 AK |
363 | extern void add_taint(unsigned flag); |
364 | extern int test_taint(unsigned flag); | |
365 | extern unsigned long get_taint(void); | |
b920de1b | 366 | extern int root_mountflags; |
1da177e4 | 367 | |
2ce802f6 TH |
368 | extern bool early_boot_irqs_disabled; |
369 | ||
1da177e4 LT |
370 | /* Values used for system_state */ |
371 | extern enum system_states { | |
372 | SYSTEM_BOOTING, | |
373 | SYSTEM_RUNNING, | |
374 | SYSTEM_HALT, | |
375 | SYSTEM_POWER_OFF, | |
376 | SYSTEM_RESTART, | |
729b4d4c | 377 | SYSTEM_SUSPEND_DISK, |
1da177e4 LT |
378 | } system_state; |
379 | ||
25ddbb18 AK |
380 | #define TAINT_PROPRIETARY_MODULE 0 |
381 | #define TAINT_FORCED_MODULE 1 | |
382 | #define TAINT_UNSAFE_SMP 2 | |
383 | #define TAINT_FORCED_RMMOD 3 | |
384 | #define TAINT_MACHINE_CHECK 4 | |
385 | #define TAINT_BAD_PAGE 5 | |
386 | #define TAINT_USER 6 | |
387 | #define TAINT_DIE 7 | |
388 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
389 | #define TAINT_WARN 9 | |
26e9a397 | 390 | #define TAINT_CRAP 10 |
92946bc7 | 391 | #define TAINT_FIRMWARE_WORKAROUND 11 |
2449b8ba | 392 | #define TAINT_OOT_MODULE 12 |
1da177e4 | 393 | |
3fc95772 HH |
394 | extern const char hex_asc[]; |
395 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
396 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
397 | ||
55036ba7 | 398 | static inline char *hex_byte_pack(char *buf, u8 byte) |
3fc95772 HH |
399 | { |
400 | *buf++ = hex_asc_hi(byte); | |
401 | *buf++ = hex_asc_lo(byte); | |
402 | return buf; | |
403 | } | |
99eaf3c4 | 404 | |
55036ba7 AS |
405 | static inline char * __deprecated pack_hex_byte(char *buf, u8 byte) |
406 | { | |
407 | return hex_byte_pack(buf, byte); | |
408 | } | |
409 | ||
90378889 | 410 | extern int hex_to_bin(char ch); |
b7804983 | 411 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
90378889 | 412 | |
526211bc IM |
413 | /* |
414 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
415 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
416 | * | |
417 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
418 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 419 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
420 | * file, which gives a means for the kernel and userspace to interact. |
421 | * Place a tracing_off() in the kernel where you want tracing to end. | |
422 | * From user space, examine the trace, and then echo 1 > tracing_on | |
423 | * to continue tracing. | |
424 | * | |
425 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
426 | * by things like suspend to ram where disabling the recording of the | |
427 | * trace is not enough, but tracing must actually stop because things | |
428 | * like calling smp_processor_id() may crash the system. | |
429 | * | |
430 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 431 | */ |
2002c258 | 432 | #ifdef CONFIG_RING_BUFFER |
2002c258 SR |
433 | /* trace_off_permanent stops recording with no way to bring it back */ |
434 | void tracing_off_permanent(void); | |
2002c258 | 435 | #else |
2002c258 | 436 | static inline void tracing_off_permanent(void) { } |
2002c258 | 437 | #endif |
cecbca96 FW |
438 | |
439 | enum ftrace_dump_mode { | |
440 | DUMP_NONE, | |
441 | DUMP_ALL, | |
442 | DUMP_ORIG, | |
443 | }; | |
444 | ||
526211bc | 445 | #ifdef CONFIG_TRACING |
93d68e52 SR |
446 | void tracing_on(void); |
447 | void tracing_off(void); | |
448 | int tracing_is_on(void); | |
449 | ||
526211bc IM |
450 | extern void tracing_start(void); |
451 | extern void tracing_stop(void); | |
452 | extern void ftrace_off_permanent(void); | |
453 | ||
b9075fa9 JP |
454 | static inline __printf(1, 2) |
455 | void ____trace_printk_check_format(const char *fmt, ...) | |
769b0441 FW |
456 | { |
457 | } | |
458 | #define __trace_printk_check_format(fmt, args...) \ | |
459 | do { \ | |
460 | if (0) \ | |
461 | ____trace_printk_check_format(fmt, ##args); \ | |
462 | } while (0) | |
463 | ||
526211bc IM |
464 | /** |
465 | * trace_printk - printf formatting in the ftrace buffer | |
466 | * @fmt: the printf format for printing | |
467 | * | |
468 | * Note: __trace_printk is an internal function for trace_printk and | |
469 | * the @ip is passed in via the trace_printk macro. | |
470 | * | |
471 | * This function allows a kernel developer to debug fast path sections | |
472 | * that printk is not appropriate for. By scattering in various | |
473 | * printk like tracing in the code, a developer can quickly see | |
474 | * where problems are occurring. | |
475 | * | |
476 | * This is intended as a debugging tool for the developer only. | |
477 | * Please refrain from leaving trace_printks scattered around in | |
478 | * your code. | |
479 | */ | |
769b0441 FW |
480 | |
481 | #define trace_printk(fmt, args...) \ | |
482 | do { \ | |
769b0441 | 483 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 FW |
484 | if (__builtin_constant_p(fmt)) { \ |
485 | static const char *trace_printk_fmt \ | |
486 | __attribute__((section("__trace_printk_fmt"))) = \ | |
487 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
488 | \ | |
489 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ | |
490 | } else \ | |
491 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
492 | } while (0) |
493 | ||
b9075fa9 JP |
494 | extern __printf(2, 3) |
495 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | |
48ead020 | 496 | |
b9075fa9 JP |
497 | extern __printf(2, 3) |
498 | int __trace_printk(unsigned long ip, const char *fmt, ...); | |
769b0441 | 499 | |
03889384 SR |
500 | extern void trace_dump_stack(void); |
501 | ||
48ead020 FW |
502 | /* |
503 | * The double __builtin_constant_p is because gcc will give us an error | |
504 | * if we try to allocate the static variable to fmt if it is not a | |
505 | * constant. Even with the outer if statement. | |
506 | */ | |
769b0441 FW |
507 | #define ftrace_vprintk(fmt, vargs) \ |
508 | do { \ | |
48ead020 FW |
509 | if (__builtin_constant_p(fmt)) { \ |
510 | static const char *trace_printk_fmt \ | |
511 | __attribute__((section("__trace_printk_fmt"))) = \ | |
512 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 513 | \ |
48ead020 FW |
514 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
515 | } else \ | |
516 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
517 | } while (0) |
518 | ||
48ead020 FW |
519 | extern int |
520 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); | |
521 | ||
526211bc IM |
522 | extern int |
523 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); | |
769b0441 | 524 | |
cecbca96 | 525 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 526 | #else |
b9075fa9 JP |
527 | static inline __printf(1, 2) |
528 | int trace_printk(const char *fmt, ...); | |
526211bc IM |
529 | |
530 | static inline void tracing_start(void) { } | |
531 | static inline void tracing_stop(void) { } | |
532 | static inline void ftrace_off_permanent(void) { } | |
e36c5458 | 533 | static inline void trace_dump_stack(void) { } |
93d68e52 SR |
534 | |
535 | static inline void tracing_on(void) { } | |
536 | static inline void tracing_off(void) { } | |
537 | static inline int tracing_is_on(void) { return 0; } | |
538 | ||
526211bc IM |
539 | static inline int |
540 | trace_printk(const char *fmt, ...) | |
541 | { | |
542 | return 0; | |
543 | } | |
544 | static inline int | |
545 | ftrace_vprintk(const char *fmt, va_list ap) | |
546 | { | |
547 | return 0; | |
548 | } | |
cecbca96 | 549 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 550 | #endif /* CONFIG_TRACING */ |
526211bc | 551 | |
1da177e4 | 552 | /* |
bdf4bbaa | 553 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
554 | * strict type-checking.. See the |
555 | * "unnecessary" pointer comparison. | |
556 | */ | |
bdf4bbaa HH |
557 | #define min(x, y) ({ \ |
558 | typeof(x) _min1 = (x); \ | |
559 | typeof(y) _min2 = (y); \ | |
560 | (void) (&_min1 == &_min2); \ | |
561 | _min1 < _min2 ? _min1 : _min2; }) | |
562 | ||
563 | #define max(x, y) ({ \ | |
564 | typeof(x) _max1 = (x); \ | |
565 | typeof(y) _max2 = (y); \ | |
566 | (void) (&_max1 == &_max2); \ | |
567 | _max1 > _max2 ? _max1 : _max2; }) | |
568 | ||
f27c85c5 HPP |
569 | #define min3(x, y, z) ({ \ |
570 | typeof(x) _min1 = (x); \ | |
571 | typeof(y) _min2 = (y); \ | |
572 | typeof(z) _min3 = (z); \ | |
573 | (void) (&_min1 == &_min2); \ | |
574 | (void) (&_min1 == &_min3); \ | |
575 | _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ | |
576 | (_min2 < _min3 ? _min2 : _min3); }) | |
577 | ||
578 | #define max3(x, y, z) ({ \ | |
579 | typeof(x) _max1 = (x); \ | |
580 | typeof(y) _max2 = (y); \ | |
581 | typeof(z) _max3 = (z); \ | |
582 | (void) (&_max1 == &_max2); \ | |
583 | (void) (&_max1 == &_max3); \ | |
584 | _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ | |
585 | (_max2 > _max3 ? _max2 : _max3); }) | |
586 | ||
c8bf1336 MP |
587 | /** |
588 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero | |
589 | * @x: value1 | |
590 | * @y: value2 | |
591 | */ | |
592 | #define min_not_zero(x, y) ({ \ | |
593 | typeof(x) __x = (x); \ | |
594 | typeof(y) __y = (y); \ | |
595 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | |
596 | ||
bdf4bbaa HH |
597 | /** |
598 | * clamp - return a value clamped to a given range with strict typechecking | |
599 | * @val: current value | |
600 | * @min: minimum allowable value | |
601 | * @max: maximum allowable value | |
602 | * | |
603 | * This macro does strict typechecking of min/max to make sure they are of the | |
604 | * same type as val. See the unnecessary pointer comparisons. | |
605 | */ | |
606 | #define clamp(val, min, max) ({ \ | |
607 | typeof(val) __val = (val); \ | |
608 | typeof(min) __min = (min); \ | |
609 | typeof(max) __max = (max); \ | |
610 | (void) (&__val == &__min); \ | |
611 | (void) (&__val == &__max); \ | |
612 | __val = __val < __min ? __min: __val; \ | |
613 | __val > __max ? __max: __val; }) | |
1da177e4 LT |
614 | |
615 | /* | |
616 | * ..and if you can't take the strict | |
617 | * types, you can specify one yourself. | |
618 | * | |
bdf4bbaa HH |
619 | * Or not use min/max/clamp at all, of course. |
620 | */ | |
621 | #define min_t(type, x, y) ({ \ | |
622 | type __min1 = (x); \ | |
623 | type __min2 = (y); \ | |
624 | __min1 < __min2 ? __min1: __min2; }) | |
625 | ||
626 | #define max_t(type, x, y) ({ \ | |
627 | type __max1 = (x); \ | |
628 | type __max2 = (y); \ | |
629 | __max1 > __max2 ? __max1: __max2; }) | |
630 | ||
631 | /** | |
632 | * clamp_t - return a value clamped to a given range using a given type | |
633 | * @type: the type of variable to use | |
634 | * @val: current value | |
635 | * @min: minimum allowable value | |
636 | * @max: maximum allowable value | |
637 | * | |
638 | * This macro does no typechecking and uses temporary variables of type | |
639 | * 'type' to make all the comparisons. | |
1da177e4 | 640 | */ |
bdf4bbaa HH |
641 | #define clamp_t(type, val, min, max) ({ \ |
642 | type __val = (val); \ | |
643 | type __min = (min); \ | |
644 | type __max = (max); \ | |
645 | __val = __val < __min ? __min: __val; \ | |
646 | __val > __max ? __max: __val; }) | |
1da177e4 | 647 | |
bdf4bbaa HH |
648 | /** |
649 | * clamp_val - return a value clamped to a given range using val's type | |
650 | * @val: current value | |
651 | * @min: minimum allowable value | |
652 | * @max: maximum allowable value | |
653 | * | |
654 | * This macro does no typechecking and uses temporary variables of whatever | |
655 | * type the input argument 'val' is. This is useful when val is an unsigned | |
656 | * type and min and max are literals that will otherwise be assigned a signed | |
657 | * integer type. | |
658 | */ | |
659 | #define clamp_val(val, min, max) ({ \ | |
660 | typeof(val) __val = (val); \ | |
661 | typeof(val) __min = (min); \ | |
662 | typeof(val) __max = (max); \ | |
663 | __val = __val < __min ? __min: __val; \ | |
664 | __val > __max ? __max: __val; }) | |
1da177e4 | 665 | |
91f68b73 WF |
666 | |
667 | /* | |
668 | * swap - swap value of @a and @b | |
669 | */ | |
ac7b9004 PZ |
670 | #define swap(a, b) \ |
671 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 672 | |
1da177e4 LT |
673 | /** |
674 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
675 | * @ptr: the pointer to the member. |
676 | * @type: the type of the container struct this is embedded in. | |
677 | * @member: the name of the member within the struct. | |
678 | * | |
679 | */ | |
680 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
681 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
682 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 | 683 | |
b9d4f426 AL |
684 | /* Trap pasters of __FUNCTION__ at compile-time */ |
685 | #define __FUNCTION__ (__func__) | |
686 | ||
687 | /* This helps us to avoid #ifdef CONFIG_NUMA */ | |
688 | #ifdef CONFIG_NUMA | |
689 | #define NUMA_BUILD 1 | |
690 | #else | |
691 | #define NUMA_BUILD 0 | |
692 | #endif | |
693 | ||
694 | /* This helps us avoid #ifdef CONFIG_COMPACTION */ | |
695 | #ifdef CONFIG_COMPACTION | |
696 | #define COMPACTION_BUILD 1 | |
697 | #else | |
698 | #define COMPACTION_BUILD 0 | |
699 | #endif | |
700 | ||
701 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ | |
702 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
703 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
704 | #endif | |
9d00f92f | 705 | |
9d00f92f WC |
706 | extern int do_sysinfo(struct sysinfo *info); |
707 | ||
708 | #endif /* __KERNEL__ */ | |
709 | ||
1da177e4 | 710 | #endif |