Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
40cbf09f AS |
2 | /* |
3 | * NOTE: | |
4 | * | |
5 | * This header has combined a lot of unrelated to each other stuff. | |
6 | * The process of splitting its content is in progress while keeping | |
7 | * backward compatibility. That's why it's highly recommended NOT to | |
8 | * include this header inside another header file, especially under | |
9 | * generic or architectural include/ directory. | |
10 | */ | |
1da177e4 LT |
11 | #ifndef _LINUX_KERNEL_H |
12 | #define _LINUX_KERNEL_H | |
13 | ||
c0891ac1 | 14 | #include <linux/stdarg.h> |
08c5188e | 15 | #include <linux/align.h> |
54d50897 | 16 | #include <linux/limits.h> |
1da177e4 LT |
17 | #include <linux/linkage.h> |
18 | #include <linux/stddef.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/compiler.h> | |
d2a8ebbf | 21 | #include <linux/container_of.h> |
1da177e4 | 22 | #include <linux/bitops.h> |
4c527293 | 23 | #include <linux/kstrtox.h> |
f0d1b0b3 | 24 | #include <linux/log2.h> |
aa6159ab | 25 | #include <linux/math.h> |
b296a6d5 | 26 | #include <linux/minmax.h> |
e0deaff4 | 27 | #include <linux/typecheck.h> |
f39650de | 28 | #include <linux/panic.h> |
968ab183 | 29 | #include <linux/printk.h> |
c7acec71 | 30 | #include <linux/build_bug.h> |
b965f1dd | 31 | #include <linux/static_call_types.h> |
e52340de | 32 | #include <linux/instruction_pointer.h> |
1da177e4 | 33 | #include <asm/byteorder.h> |
aa6159ab | 34 | |
607ca46e | 35 | #include <uapi/linux/kernel.h> |
1da177e4 | 36 | |
1da177e4 LT |
37 | #define STACK_MAGIC 0xdeadbeef |
38 | ||
e8c97af0 RD |
39 | /** |
40 | * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value | |
41 | * @x: value to repeat | |
42 | * | |
43 | * NOTE: @x is not checked for > 0xff; larger values produce odd results. | |
44 | */ | |
44696908 DM |
45 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
46 | ||
d3849953 CH |
47 | /* generic data direction definitions */ |
48 | #define READ 0 | |
49 | #define WRITE 1 | |
50 | ||
e8c97af0 RD |
51 | /** |
52 | * ARRAY_SIZE - get the number of elements in array @arr | |
53 | * @arr: array to be sized | |
54 | */ | |
c5e631cf RR |
55 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
56 | ||
0ab1438b MY |
57 | #define PTR_IF(cond, ptr) ((cond) ? (ptr) : NULL) |
58 | ||
3ed605bc GP |
59 | #define u64_to_user_ptr(x) ( \ |
60 | { \ | |
a0fe2c64 JH |
61 | typecheck(u64, (x)); \ |
62 | (void __user *)(uintptr_t)(x); \ | |
3ed605bc GP |
63 | } \ |
64 | ) | |
65 | ||
218e180e AM |
66 | /** |
67 | * upper_32_bits - return bits 32-63 of a number | |
68 | * @n: the number we're accessing | |
69 | * | |
70 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
71 | * the "right shift count >= width of type" warning when that quantity is | |
72 | * 32-bits. | |
73 | */ | |
74 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
75 | ||
204b885e JR |
76 | /** |
77 | * lower_32_bits - return bits 0-31 of a number | |
78 | * @n: the number we're accessing | |
79 | */ | |
ef91bb19 | 80 | #define lower_32_bits(n) ((u32)((n) & 0xffffffff)) |
204b885e | 81 | |
03cb4473 JK |
82 | /** |
83 | * upper_16_bits - return bits 16-31 of a number | |
84 | * @n: the number we're accessing | |
85 | */ | |
86 | #define upper_16_bits(n) ((u16)((n) >> 16)) | |
87 | ||
88 | /** | |
89 | * lower_16_bits - return bits 0-15 of a number | |
90 | * @n: the number we're accessing | |
91 | */ | |
92 | #define lower_16_bits(n) ((u16)((n) & 0xffff)) | |
93 | ||
1da177e4 | 94 | struct completion; |
df2e71fb | 95 | struct user; |
1da177e4 | 96 | |
a8b76910 | 97 | #ifdef CONFIG_PREEMPT_VOLUNTARY_BUILD |
b965f1dd PZI |
98 | |
99 | extern int __cond_resched(void); | |
100 | # define might_resched() __cond_resched() | |
101 | ||
102 | #elif defined(CONFIG_PREEMPT_DYNAMIC) | |
103 | ||
104 | extern int __cond_resched(void); | |
105 | ||
106 | DECLARE_STATIC_CALL(might_resched, __cond_resched); | |
107 | ||
108 | static __always_inline void might_resched(void) | |
109 | { | |
ef72661e | 110 | static_call_mod(might_resched)(); |
b965f1dd PZI |
111 | } |
112 | ||
070cb065 | 113 | #else |
b965f1dd | 114 | |
070cb065 | 115 | # define might_resched() do { } while (0) |
b965f1dd PZI |
116 | |
117 | #endif /* CONFIG_PREEMPT_* */ | |
070cb065 | 118 | |
d902db1e | 119 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
50e081b9 | 120 | extern void __might_resched(const char *file, int line, unsigned int offsets); |
42a38756 | 121 | extern void __might_sleep(const char *file, int line); |
568f1967 | 122 | extern void __cant_sleep(const char *file, int line, int preempt_offset); |
74d862b6 | 123 | extern void __cant_migrate(const char *file, int line); |
568f1967 | 124 | |
1da177e4 LT |
125 | /** |
126 | * might_sleep - annotation for functions that can sleep | |
127 | * | |
128 | * this macro will print a stack trace if it is executed in an atomic | |
312364f3 DV |
129 | * context (spinlock, irq-handler, ...). Additional sections where blocking is |
130 | * not allowed can be annotated with non_block_start() and non_block_end() | |
131 | * pairs. | |
1da177e4 LT |
132 | * |
133 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 134 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
135 | * supposed to. |
136 | */ | |
f8cbd99b | 137 | # define might_sleep() \ |
42a38756 | 138 | do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) |
568f1967 PZ |
139 | /** |
140 | * cant_sleep - annotation for functions that cannot sleep | |
141 | * | |
142 | * this macro will print a stack trace if it is executed with preemption enabled | |
143 | */ | |
144 | # define cant_sleep() \ | |
145 | do { __cant_sleep(__FILE__, __LINE__, 0); } while (0) | |
00845eb9 | 146 | # define sched_annotate_sleep() (current->task_state_change = 0) |
74d862b6 TG |
147 | |
148 | /** | |
149 | * cant_migrate - annotation for functions that cannot migrate | |
150 | * | |
151 | * Will print a stack trace if executed in code which is migratable | |
152 | */ | |
153 | # define cant_migrate() \ | |
154 | do { \ | |
155 | if (IS_ENABLED(CONFIG_SMP)) \ | |
156 | __cant_migrate(__FILE__, __LINE__); \ | |
157 | } while (0) | |
158 | ||
312364f3 DV |
159 | /** |
160 | * non_block_start - annotate the start of section where sleeping is prohibited | |
161 | * | |
162 | * This is on behalf of the oom reaper, specifically when it is calling the mmu | |
163 | * notifiers. The problem is that if the notifier were to block on, for example, | |
164 | * mutex_lock() and if the process which holds that mutex were to perform a | |
165 | * sleeping memory allocation, the oom reaper is now blocked on completion of | |
166 | * that memory allocation. Other blocking calls like wait_event() pose similar | |
167 | * issues. | |
168 | */ | |
169 | # define non_block_start() (current->non_block_count++) | |
170 | /** | |
171 | * non_block_end - annotate the end of section where sleeping is prohibited | |
172 | * | |
173 | * Closes a section opened by non_block_start(). | |
174 | */ | |
175 | # define non_block_end() WARN_ON(current->non_block_count-- == 0) | |
1da177e4 | 176 | #else |
874f670e | 177 | static inline void __might_resched(const char *file, int line, |
50e081b9 | 178 | unsigned int offsets) { } |
42a38756 | 179 | static inline void __might_sleep(const char *file, int line) { } |
f8cbd99b | 180 | # define might_sleep() do { might_resched(); } while (0) |
568f1967 | 181 | # define cant_sleep() do { } while (0) |
74d862b6 | 182 | # define cant_migrate() do { } while (0) |
1029a2b5 | 183 | # define sched_annotate_sleep() do { } while (0) |
312364f3 DV |
184 | # define non_block_start() do { } while (0) |
185 | # define non_block_end() do { } while (0) | |
1da177e4 LT |
186 | #endif |
187 | ||
368a5fa1 | 188 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 189 | |
386e7906 AL |
190 | #if defined(CONFIG_MMU) && \ |
191 | (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)) | |
9ec23531 DH |
192 | #define might_fault() __might_fault(__FILE__, __LINE__) |
193 | void __might_fault(const char *file, int line); | |
3ee1afa3 | 194 | #else |
662bbcb2 | 195 | static inline void might_fault(void) { } |
3ee1afa3 NP |
196 | #endif |
197 | ||
9af6528e | 198 | void do_exit(long error_code) __noreturn; |
33ee3b2e | 199 | |
d1be35cb AV |
200 | extern int num_to_str(char *buf, int size, |
201 | unsigned long long num, unsigned int width); | |
1ac101a5 | 202 | |
67d0a075 JP |
203 | /* lib/printf utilities */ |
204 | ||
b9075fa9 JP |
205 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
206 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | |
207 | extern __printf(3, 4) | |
208 | int snprintf(char *buf, size_t size, const char *fmt, ...); | |
209 | extern __printf(3, 0) | |
210 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
211 | extern __printf(3, 4) | |
212 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | |
213 | extern __printf(3, 0) | |
214 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | |
48a27055 | 215 | extern __printf(2, 3) __malloc |
b9075fa9 | 216 | char *kasprintf(gfp_t gfp, const char *fmt, ...); |
48a27055 | 217 | extern __printf(2, 0) __malloc |
8db14860 | 218 | char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
0a9df786 RV |
219 | extern __printf(2, 0) |
220 | const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args); | |
1da177e4 | 221 | |
6061d949 JP |
222 | extern __scanf(2, 3) |
223 | int sscanf(const char *, const char *, ...); | |
224 | extern __scanf(2, 0) | |
225 | int vsscanf(const char *, const char *, va_list); | |
1da177e4 | 226 | |
79270291 SB |
227 | extern int no_hash_pointers_enable(char *str); |
228 | ||
1da177e4 LT |
229 | extern int get_option(char **str, int *pint); |
230 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 231 | extern unsigned long long memparse(const char *ptr, char **retptr); |
6ccc72b8 | 232 | extern bool parse_option_str(const char *str, const char *option); |
f51b17c8 | 233 | extern char *next_arg(char *args, char **param, char **val); |
1da177e4 | 234 | |
5e376613 | 235 | extern int core_kernel_text(unsigned long addr); |
1da177e4 LT |
236 | extern int __kernel_text_address(unsigned long addr); |
237 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 238 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 239 | |
1da177e4 | 240 | extern void bust_spinlocks(int yes); |
5375b708 | 241 | |
b920de1b | 242 | extern int root_mountflags; |
1da177e4 | 243 | |
2ce802f6 TH |
244 | extern bool early_boot_irqs_disabled; |
245 | ||
69a78ff2 TG |
246 | /* |
247 | * Values used for system_state. Ordering of the states must not be changed | |
248 | * as code checks for <, <=, >, >= STATE. | |
249 | */ | |
1da177e4 LT |
250 | extern enum system_states { |
251 | SYSTEM_BOOTING, | |
69a78ff2 | 252 | SYSTEM_SCHEDULING, |
d2635f20 | 253 | SYSTEM_FREEING_INITMEM, |
1da177e4 LT |
254 | SYSTEM_RUNNING, |
255 | SYSTEM_HALT, | |
256 | SYSTEM_POWER_OFF, | |
257 | SYSTEM_RESTART, | |
c1a957d1 | 258 | SYSTEM_SUSPEND, |
1da177e4 LT |
259 | } system_state; |
260 | ||
3fc95772 HH |
261 | extern const char hex_asc[]; |
262 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
263 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
264 | ||
55036ba7 | 265 | static inline char *hex_byte_pack(char *buf, u8 byte) |
3fc95772 HH |
266 | { |
267 | *buf++ = hex_asc_hi(byte); | |
268 | *buf++ = hex_asc_lo(byte); | |
269 | return buf; | |
270 | } | |
99eaf3c4 | 271 | |
c26d436c AN |
272 | extern const char hex_asc_upper[]; |
273 | #define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)] | |
274 | #define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4] | |
275 | ||
276 | static inline char *hex_byte_pack_upper(char *buf, u8 byte) | |
277 | { | |
278 | *buf++ = hex_asc_upper_hi(byte); | |
279 | *buf++ = hex_asc_upper_lo(byte); | |
280 | return buf; | |
281 | } | |
282 | ||
90378889 | 283 | extern int hex_to_bin(char ch); |
b7804983 | 284 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
53d91c5c | 285 | extern char *bin2hex(char *dst, const void *src, size_t count); |
90378889 | 286 | |
a69f5edb | 287 | bool mac_pton(const char *s, u8 *mac); |
4cd5773a | 288 | |
526211bc IM |
289 | /* |
290 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
291 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
292 | * | |
293 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
294 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 295 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
296 | * file, which gives a means for the kernel and userspace to interact. |
297 | * Place a tracing_off() in the kernel where you want tracing to end. | |
298 | * From user space, examine the trace, and then echo 1 > tracing_on | |
299 | * to continue tracing. | |
300 | * | |
301 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
302 | * by things like suspend to ram where disabling the recording of the | |
303 | * trace is not enough, but tracing must actually stop because things | |
304 | * like calling smp_processor_id() may crash the system. | |
305 | * | |
306 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 307 | */ |
cecbca96 FW |
308 | |
309 | enum ftrace_dump_mode { | |
310 | DUMP_NONE, | |
311 | DUMP_ALL, | |
312 | DUMP_ORIG, | |
313 | }; | |
314 | ||
526211bc | 315 | #ifdef CONFIG_TRACING |
93d68e52 SR |
316 | void tracing_on(void); |
317 | void tracing_off(void); | |
318 | int tracing_is_on(void); | |
ad909e21 SRRH |
319 | void tracing_snapshot(void); |
320 | void tracing_snapshot_alloc(void); | |
93d68e52 | 321 | |
526211bc IM |
322 | extern void tracing_start(void); |
323 | extern void tracing_stop(void); | |
526211bc | 324 | |
b9075fa9 JP |
325 | static inline __printf(1, 2) |
326 | void ____trace_printk_check_format(const char *fmt, ...) | |
769b0441 FW |
327 | { |
328 | } | |
329 | #define __trace_printk_check_format(fmt, args...) \ | |
330 | do { \ | |
331 | if (0) \ | |
332 | ____trace_printk_check_format(fmt, ##args); \ | |
333 | } while (0) | |
334 | ||
526211bc IM |
335 | /** |
336 | * trace_printk - printf formatting in the ftrace buffer | |
337 | * @fmt: the printf format for printing | |
338 | * | |
e8c97af0 RD |
339 | * Note: __trace_printk is an internal function for trace_printk() and |
340 | * the @ip is passed in via the trace_printk() macro. | |
526211bc IM |
341 | * |
342 | * This function allows a kernel developer to debug fast path sections | |
343 | * that printk is not appropriate for. By scattering in various | |
344 | * printk like tracing in the code, a developer can quickly see | |
345 | * where problems are occurring. | |
346 | * | |
347 | * This is intended as a debugging tool for the developer only. | |
348 | * Please refrain from leaving trace_printks scattered around in | |
09ae7234 | 349 | * your code. (Extra memory is used for special buffers that are |
e8c97af0 | 350 | * allocated when trace_printk() is used.) |
9d3c752c | 351 | * |
8730662d | 352 | * A little optimization trick is done here. If there's only one |
9d3c752c SRRH |
353 | * argument, there's no need to scan the string for printf formats. |
354 | * The trace_puts() will suffice. But how can we take advantage of | |
355 | * using trace_puts() when trace_printk() has only one argument? | |
356 | * By stringifying the args and checking the size we can tell | |
357 | * whether or not there are args. __stringify((__VA_ARGS__)) will | |
358 | * turn into "()\0" with a size of 3 when there are no args, anything | |
359 | * else will be bigger. All we need to do is define a string to this, | |
360 | * and then take its size and compare to 3. If it's bigger, use | |
361 | * do_trace_printk() otherwise, optimize it to trace_puts(). Then just | |
362 | * let gcc optimize the rest. | |
526211bc | 363 | */ |
769b0441 | 364 | |
9d3c752c SRRH |
365 | #define trace_printk(fmt, ...) \ |
366 | do { \ | |
367 | char _______STR[] = __stringify((__VA_ARGS__)); \ | |
368 | if (sizeof(_______STR) > 3) \ | |
369 | do_trace_printk(fmt, ##__VA_ARGS__); \ | |
370 | else \ | |
371 | trace_puts(fmt); \ | |
372 | } while (0) | |
373 | ||
374 | #define do_trace_printk(fmt, args...) \ | |
769b0441 | 375 | do { \ |
3debb0a9 | 376 | static const char *trace_printk_fmt __used \ |
33def849 | 377 | __section("__trace_printk_fmt") = \ |
07d777fe SR |
378 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
379 | \ | |
769b0441 | 380 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 | 381 | \ |
07d777fe | 382 | if (__builtin_constant_p(fmt)) \ |
48ead020 | 383 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
07d777fe SR |
384 | else \ |
385 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
386 | } while (0) |
387 | ||
b9075fa9 JP |
388 | extern __printf(2, 3) |
389 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | |
48ead020 | 390 | |
b9075fa9 JP |
391 | extern __printf(2, 3) |
392 | int __trace_printk(unsigned long ip, const char *fmt, ...); | |
769b0441 | 393 | |
09ae7234 SRRH |
394 | /** |
395 | * trace_puts - write a string into the ftrace buffer | |
396 | * @str: the string to record | |
397 | * | |
398 | * Note: __trace_bputs is an internal function for trace_puts and | |
399 | * the @ip is passed in via the trace_puts macro. | |
400 | * | |
401 | * This is similar to trace_printk() but is made for those really fast | |
e8c97af0 | 402 | * paths that a developer wants the least amount of "Heisenbug" effects, |
09ae7234 SRRH |
403 | * where the processing of the print format is still too much. |
404 | * | |
405 | * This function allows a kernel developer to debug fast path sections | |
406 | * that printk is not appropriate for. By scattering in various | |
407 | * printk like tracing in the code, a developer can quickly see | |
408 | * where problems are occurring. | |
409 | * | |
410 | * This is intended as a debugging tool for the developer only. | |
411 | * Please refrain from leaving trace_puts scattered around in | |
412 | * your code. (Extra memory is used for special buffers that are | |
e8c97af0 | 413 | * allocated when trace_puts() is used.) |
09ae7234 SRRH |
414 | * |
415 | * Returns: 0 if nothing was written, positive # if string was. | |
416 | * (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) | |
417 | */ | |
418 | ||
09ae7234 | 419 | #define trace_puts(str) ({ \ |
3debb0a9 | 420 | static const char *trace_printk_fmt __used \ |
33def849 | 421 | __section("__trace_printk_fmt") = \ |
09ae7234 SRRH |
422 | __builtin_constant_p(str) ? str : NULL; \ |
423 | \ | |
424 | if (__builtin_constant_p(str)) \ | |
425 | __trace_bputs(_THIS_IP_, trace_printk_fmt); \ | |
426 | else \ | |
427 | __trace_puts(_THIS_IP_, str, strlen(str)); \ | |
428 | }) | |
bcf312cf SR |
429 | extern int __trace_bputs(unsigned long ip, const char *str); |
430 | extern int __trace_puts(unsigned long ip, const char *str, int size); | |
09ae7234 | 431 | |
c142be8e | 432 | extern void trace_dump_stack(int skip); |
03889384 | 433 | |
48ead020 FW |
434 | /* |
435 | * The double __builtin_constant_p is because gcc will give us an error | |
436 | * if we try to allocate the static variable to fmt if it is not a | |
437 | * constant. Even with the outer if statement. | |
438 | */ | |
769b0441 FW |
439 | #define ftrace_vprintk(fmt, vargs) \ |
440 | do { \ | |
48ead020 | 441 | if (__builtin_constant_p(fmt)) { \ |
3debb0a9 | 442 | static const char *trace_printk_fmt __used \ |
33def849 | 443 | __section("__trace_printk_fmt") = \ |
48ead020 | 444 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
7bffc23e | 445 | \ |
48ead020 FW |
446 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
447 | } else \ | |
448 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
449 | } while (0) |
450 | ||
8db14860 | 451 | extern __printf(2, 0) int |
48ead020 FW |
452 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
453 | ||
8db14860 | 454 | extern __printf(2, 0) int |
526211bc | 455 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
769b0441 | 456 | |
cecbca96 | 457 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 458 | #else |
526211bc IM |
459 | static inline void tracing_start(void) { } |
460 | static inline void tracing_stop(void) { } | |
e67bc51e | 461 | static inline void trace_dump_stack(int skip) { } |
93d68e52 SR |
462 | |
463 | static inline void tracing_on(void) { } | |
464 | static inline void tracing_off(void) { } | |
465 | static inline int tracing_is_on(void) { return 0; } | |
ad909e21 SRRH |
466 | static inline void tracing_snapshot(void) { } |
467 | static inline void tracing_snapshot_alloc(void) { } | |
93d68e52 | 468 | |
60efc15a MH |
469 | static inline __printf(1, 2) |
470 | int trace_printk(const char *fmt, ...) | |
526211bc IM |
471 | { |
472 | return 0; | |
473 | } | |
8db14860 | 474 | static __printf(1, 0) inline int |
526211bc IM |
475 | ftrace_vprintk(const char *fmt, va_list ap) |
476 | { | |
477 | return 0; | |
478 | } | |
cecbca96 | 479 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 480 | #endif /* CONFIG_TRACING */ |
526211bc | 481 | |
cf14f27f AS |
482 | /* This counts to 12. Any more, it will return 13th argument. */ |
483 | #define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n | |
484 | #define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) | |
485 | ||
486 | #define __CONCAT(a, b) a ## b | |
487 | #define CONCATENATE(a, b) __CONCAT(a, b) | |
488 | ||
b9d4f426 AL |
489 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
490 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
491 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
492 | #endif | |
9d00f92f | 493 | |
58f86cc8 | 494 | /* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ |
28b8d0c8 GCM |
495 | #define VERIFY_OCTAL_PERMISSIONS(perms) \ |
496 | (BUILD_BUG_ON_ZERO((perms) < 0) + \ | |
497 | BUILD_BUG_ON_ZERO((perms) > 0777) + \ | |
498 | /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ | |
499 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ | |
500 | BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ | |
501 | /* USER_WRITABLE >= GROUP_WRITABLE */ \ | |
502 | BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ | |
503 | /* OTHER_WRITABLE? Generally considered a bad idea. */ \ | |
504 | BUILD_BUG_ON_ZERO((perms) & 2) + \ | |
58f86cc8 | 505 | (perms)) |
1da177e4 | 506 | #endif |