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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_KERNEL_H |
2 | #define _LINUX_KERNEL_H | |
3 | ||
4 | /* | |
5 | * 'kernel.h' contains some often-used function prototypes etc | |
6 | */ | |
7 | ||
8 | #ifdef __KERNEL__ | |
9 | ||
10 | #include <stdarg.h> | |
11 | #include <linux/linkage.h> | |
12 | #include <linux/stddef.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/compiler.h> | |
15 | #include <linux/bitops.h> | |
f0d1b0b3 | 16 | #include <linux/log2.h> |
e0deaff4 | 17 | #include <linux/typecheck.h> |
717115e1 | 18 | #include <linux/ratelimit.h> |
e9d376f0 | 19 | #include <linux/dynamic_debug.h> |
1da177e4 LT |
20 | #include <asm/byteorder.h> |
21 | #include <asm/bug.h> | |
22 | ||
3eb3c740 RZ |
23 | extern const char linux_banner[]; |
24 | extern const char linux_proc_banner[]; | |
25 | ||
44f564a4 ZY |
26 | #define USHORT_MAX ((u16)(~0U)) |
27 | #define SHORT_MAX ((s16)(USHORT_MAX>>1)) | |
28 | #define SHORT_MIN (-SHORT_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 | ||
2ea58144 LT |
41 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
42 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(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 | ||
4552d5dc | 48 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
930631ed | 49 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
b4cac1a0 | 50 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |
9fe06081 DW |
51 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
52 | { \ | |
53 | typeof(divisor) __divisor = divisor; \ | |
54 | (((x) + ((__divisor) / 2)) / (__divisor)); \ | |
55 | } \ | |
56 | ) | |
1da177e4 | 57 | |
ca31e146 EGM |
58 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
59 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
60 | ||
90c699a9 | 61 | #ifdef CONFIG_LBDAF |
2da96acd JA |
62 | # include <asm/div64.h> |
63 | # define sector_div(a, b) do_div(a, b) | |
64 | #else | |
65 | # define sector_div(n, b)( \ | |
66 | { \ | |
67 | int _res; \ | |
68 | _res = (n) % (b); \ | |
69 | (n) /= (b); \ | |
70 | _res; \ | |
71 | } \ | |
72 | ) | |
73 | #endif | |
74 | ||
218e180e AM |
75 | /** |
76 | * upper_32_bits - return bits 32-63 of a number | |
77 | * @n: the number we're accessing | |
78 | * | |
79 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
80 | * the "right shift count >= width of type" warning when that quantity is | |
81 | * 32-bits. | |
82 | */ | |
83 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
84 | ||
204b885e JR |
85 | /** |
86 | * lower_32_bits - return bits 0-31 of a number | |
87 | * @n: the number we're accessing | |
88 | */ | |
89 | #define lower_32_bits(n) ((u32)(n)) | |
90 | ||
1da177e4 LT |
91 | #define KERN_EMERG "<0>" /* system is unusable */ |
92 | #define KERN_ALERT "<1>" /* action must be taken immediately */ | |
93 | #define KERN_CRIT "<2>" /* critical conditions */ | |
94 | #define KERN_ERR "<3>" /* error conditions */ | |
95 | #define KERN_WARNING "<4>" /* warning conditions */ | |
96 | #define KERN_NOTICE "<5>" /* normal but significant condition */ | |
97 | #define KERN_INFO "<6>" /* informational */ | |
98 | #define KERN_DEBUG "<7>" /* debug-level messages */ | |
99 | ||
e28d7137 LT |
100 | /* Use the default kernel loglevel */ |
101 | #define KERN_DEFAULT "<d>" | |
47492527 IM |
102 | /* |
103 | * Annotation for a "continued" line of log printout (only done after a | |
104 | * line that had no enclosing \n). Only to be used by core/arch code | |
105 | * during early bootup (a continued line is not SMP-safe otherwise). | |
106 | */ | |
5fd29d6c | 107 | #define KERN_CONT "<c>" |
47492527 | 108 | |
1da177e4 LT |
109 | extern int console_printk[]; |
110 | ||
111 | #define console_loglevel (console_printk[0]) | |
112 | #define default_message_loglevel (console_printk[1]) | |
113 | #define minimum_console_loglevel (console_printk[2]) | |
114 | #define default_console_loglevel (console_printk[3]) | |
115 | ||
116 | struct completion; | |
df2e71fb | 117 | struct pt_regs; |
118 | struct user; | |
1da177e4 | 119 | |
070cb065 UKK |
120 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
121 | extern int _cond_resched(void); | |
122 | # define might_resched() _cond_resched() | |
123 | #else | |
124 | # define might_resched() do { } while (0) | |
125 | #endif | |
126 | ||
7106a27b | 127 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
e4aafea2 | 128 | void __might_sleep(char *file, int line, int preempt_offset); |
1da177e4 LT |
129 | /** |
130 | * might_sleep - annotation for functions that can sleep | |
131 | * | |
132 | * this macro will print a stack trace if it is executed in an atomic | |
133 | * context (spinlock, irq-handler, ...). | |
134 | * | |
135 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 136 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
137 | * supposed to. |
138 | */ | |
f8cbd99b | 139 | # define might_sleep() \ |
e4aafea2 | 140 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
1da177e4 | 141 | #else |
e4aafea2 | 142 | static inline void __might_sleep(char *file, int line, int preempt_offset) { } |
f8cbd99b | 143 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
144 | #endif |
145 | ||
368a5fa1 | 146 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 147 | |
1da177e4 LT |
148 | #define abs(x) ({ \ |
149 | int __x = (x); \ | |
150 | (__x < 0) ? -__x : __x; \ | |
151 | }) | |
152 | ||
3ee1afa3 NP |
153 | #ifdef CONFIG_PROVE_LOCKING |
154 | void might_fault(void); | |
155 | #else | |
156 | static inline void might_fault(void) | |
157 | { | |
158 | might_sleep(); | |
159 | } | |
160 | #endif | |
161 | ||
e041c683 | 162 | extern struct atomic_notifier_head panic_notifier_list; |
1da177e4 LT |
163 | extern long (*panic_blink)(long time); |
164 | NORET_TYPE void panic(const char * fmt, ...) | |
a586df06 | 165 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
dd287796 AM |
166 | extern void oops_enter(void); |
167 | extern void oops_exit(void); | |
168 | extern int oops_may_print(void); | |
ec701584 | 169 | NORET_TYPE void do_exit(long error_code) |
1da177e4 LT |
170 | ATTRIB_NORET; |
171 | NORET_TYPE void complete_and_exit(struct completion *, long) | |
172 | ATTRIB_NORET; | |
173 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); | |
174 | extern long simple_strtol(const char *,char **,unsigned int); | |
175 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
176 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
06b2a76d YY |
177 | extern int strict_strtoul(const char *, unsigned int, unsigned long *); |
178 | extern int strict_strtol(const char *, unsigned int, long *); | |
179 | extern int strict_strtoull(const char *, unsigned int, unsigned long long *); | |
180 | extern int strict_strtoll(const char *, unsigned int, long long *); | |
1da177e4 LT |
181 | extern int sprintf(char * buf, const char * fmt, ...) |
182 | __attribute__ ((format (printf, 2, 3))); | |
183 | extern int vsprintf(char *buf, const char *, va_list) | |
184 | __attribute__ ((format (printf, 2, 0))); | |
185 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) | |
186 | __attribute__ ((format (printf, 3, 4))); | |
187 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
188 | __attribute__ ((format (printf, 3, 0))); | |
189 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) | |
190 | __attribute__ ((format (printf, 3, 4))); | |
191 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
192 | __attribute__ ((format (printf, 3, 0))); | |
e905914f JF |
193 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
194 | __attribute__ ((format (printf, 2, 3))); | |
11443ec7 | 195 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
1da177e4 LT |
196 | |
197 | extern int sscanf(const char *, const char *, ...) | |
198 | __attribute__ ((format (scanf, 2, 3))); | |
199 | extern int vsscanf(const char *, const char *, va_list) | |
200 | __attribute__ ((format (scanf, 2, 0))); | |
201 | ||
202 | extern int get_option(char **str, int *pint); | |
203 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 204 | extern unsigned long long memparse(const char *ptr, char **retptr); |
1da177e4 | 205 | |
5e376613 | 206 | extern int core_kernel_text(unsigned long addr); |
1da177e4 LT |
207 | extern int __kernel_text_address(unsigned long addr); |
208 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 209 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 210 | |
04a2e6a5 EB |
211 | struct pid; |
212 | extern struct pid *session_of_pgrp(struct pid *pgrp); | |
1da177e4 | 213 | |
a0ad05c7 TR |
214 | /* |
215 | * FW_BUG | |
216 | * Add this to a message where you are sure the firmware is buggy or behaves | |
217 | * really stupid or out of spec. Be aware that the responsible BIOS developer | |
218 | * should be able to fix this issue or at least get a concrete idea of the | |
219 | * problem by reading your message without the need of looking at the kernel | |
220 | * code. | |
221 | * | |
222 | * Use it for definite and high priority BIOS bugs. | |
223 | * | |
224 | * FW_WARN | |
225 | * Use it for not that clear (e.g. could the kernel messed up things already?) | |
226 | * and medium priority BIOS bugs. | |
227 | * | |
228 | * FW_INFO | |
229 | * Use this one if you want to tell the user or vendor about something | |
230 | * suspicious, but generally harmless related to the firmware. | |
231 | * | |
232 | * Use it for information or very low priority BIOS bugs. | |
233 | */ | |
234 | #define FW_BUG "[Firmware Bug]: " | |
235 | #define FW_WARN "[Firmware Warn]: " | |
236 | #define FW_INFO "[Firmware Info]: " | |
237 | ||
d59745ce | 238 | #ifdef CONFIG_PRINTK |
1da177e4 LT |
239 | asmlinkage int vprintk(const char *fmt, va_list args) |
240 | __attribute__ ((format (printf, 1, 0))); | |
241 | asmlinkage int printk(const char * fmt, ...) | |
a586df06 | 242 | __attribute__ ((format (printf, 1, 2))) __cold; |
7ef3d2fd | 243 | |
717115e1 | 244 | extern struct ratelimit_state printk_ratelimit_state; |
7ef3d2fd | 245 | extern int printk_ratelimit(void); |
7ef3d2fd JP |
246 | extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, |
247 | unsigned int interval_msec); | |
f036be96 | 248 | |
af91322e DY |
249 | extern int printk_delay_msec; |
250 | ||
f036be96 IM |
251 | /* |
252 | * Print a one-time message (analogous to WARN_ONCE() et al): | |
253 | */ | |
254 | #define printk_once(x...) ({ \ | |
70867453 | 255 | static bool __print_once = true; \ |
f036be96 IM |
256 | \ |
257 | if (__print_once) { \ | |
70867453 | 258 | __print_once = false; \ |
f036be96 IM |
259 | printk(x); \ |
260 | } \ | |
261 | }) | |
262 | ||
04d491ab | 263 | void log_buf_kexec_setup(void); |
d59745ce MM |
264 | #else |
265 | static inline int vprintk(const char *s, va_list args) | |
266 | __attribute__ ((format (printf, 1, 0))); | |
267 | static inline int vprintk(const char *s, va_list args) { return 0; } | |
268 | static inline int printk(const char *s, ...) | |
269 | __attribute__ ((format (printf, 1, 2))); | |
a586df06 | 270 | static inline int __cold printk(const char *s, ...) { return 0; } |
7ef3d2fd | 271 | static inline int printk_ratelimit(void) { return 0; } |
7ef3d2fd JP |
272 | static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ |
273 | unsigned int interval_msec) \ | |
274 | { return false; } | |
f036be96 IM |
275 | |
276 | /* No effect, but we still get type checking even in the !PRINTK case: */ | |
277 | #define printk_once(x...) printk(x) | |
278 | ||
04d491ab NH |
279 | static inline void log_buf_kexec_setup(void) |
280 | { | |
281 | } | |
d59745ce | 282 | #endif |
1da177e4 | 283 | |
ced9cd40 IM |
284 | extern int printk_needs_cpu(int cpu); |
285 | extern void printk_tick(void); | |
286 | ||
e17ba73b | 287 | extern void asmlinkage __attribute__((format(printf, 1, 2))) |
076f9776 IM |
288 | early_printk(const char *fmt, ...); |
289 | ||
1da177e4 LT |
290 | unsigned long int_sqrt(unsigned long); |
291 | ||
1da177e4 LT |
292 | static inline void console_silent(void) |
293 | { | |
294 | console_loglevel = 0; | |
295 | } | |
296 | ||
297 | static inline void console_verbose(void) | |
298 | { | |
299 | if (console_loglevel) | |
300 | console_loglevel = 15; | |
301 | } | |
302 | ||
303 | extern void bust_spinlocks(int yes); | |
e3e8a75d | 304 | extern void wake_up_klogd(void); |
1da177e4 | 305 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
aa727107 | 306 | extern int panic_timeout; |
1da177e4 | 307 | extern int panic_on_oops; |
8da5adda | 308 | extern int panic_on_unrecovered_nmi; |
5211a242 | 309 | extern int panic_on_io_nmi; |
1da177e4 | 310 | extern const char *print_tainted(void); |
25ddbb18 AK |
311 | extern void add_taint(unsigned flag); |
312 | extern int test_taint(unsigned flag); | |
313 | extern unsigned long get_taint(void); | |
b920de1b | 314 | extern int root_mountflags; |
1da177e4 LT |
315 | |
316 | /* Values used for system_state */ | |
317 | extern enum system_states { | |
318 | SYSTEM_BOOTING, | |
319 | SYSTEM_RUNNING, | |
320 | SYSTEM_HALT, | |
321 | SYSTEM_POWER_OFF, | |
322 | SYSTEM_RESTART, | |
729b4d4c | 323 | SYSTEM_SUSPEND_DISK, |
1da177e4 LT |
324 | } system_state; |
325 | ||
25ddbb18 AK |
326 | #define TAINT_PROPRIETARY_MODULE 0 |
327 | #define TAINT_FORCED_MODULE 1 | |
328 | #define TAINT_UNSAFE_SMP 2 | |
329 | #define TAINT_FORCED_RMMOD 3 | |
330 | #define TAINT_MACHINE_CHECK 4 | |
331 | #define TAINT_BAD_PAGE 5 | |
332 | #define TAINT_USER 6 | |
333 | #define TAINT_DIE 7 | |
334 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
335 | #define TAINT_WARN 9 | |
26e9a397 | 336 | #define TAINT_CRAP 10 |
1da177e4 | 337 | |
a586df06 | 338 | extern void dump_stack(void) __cold; |
1da177e4 | 339 | |
99eaf3c4 RD |
340 | enum { |
341 | DUMP_PREFIX_NONE, | |
342 | DUMP_PREFIX_ADDRESS, | |
343 | DUMP_PREFIX_OFFSET | |
344 | }; | |
c7909234 RD |
345 | extern void hex_dump_to_buffer(const void *buf, size_t len, |
346 | int rowsize, int groupsize, | |
347 | char *linebuf, size_t linebuflen, bool ascii); | |
348 | extern void print_hex_dump(const char *level, const char *prefix_str, | |
349 | int prefix_type, int rowsize, int groupsize, | |
6a0ed91e | 350 | const void *buf, size_t len, bool ascii); |
c7909234 | 351 | extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
eb9a9a56 | 352 | const void *buf, size_t len); |
3fc95772 HH |
353 | |
354 | extern const char hex_asc[]; | |
355 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
356 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
357 | ||
358 | static inline char *pack_hex_byte(char *buf, u8 byte) | |
359 | { | |
360 | *buf++ = hex_asc_hi(byte); | |
361 | *buf++ = hex_asc_lo(byte); | |
362 | return buf; | |
363 | } | |
99eaf3c4 | 364 | |
d091c2f5 MS |
365 | #ifndef pr_fmt |
366 | #define pr_fmt(fmt) fmt | |
367 | #endif | |
368 | ||
369 | #define pr_emerg(fmt, ...) \ | |
370 | printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) | |
371 | #define pr_alert(fmt, ...) \ | |
372 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) | |
373 | #define pr_crit(fmt, ...) \ | |
374 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) | |
375 | #define pr_err(fmt, ...) \ | |
376 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | |
377 | #define pr_warning(fmt, ...) \ | |
378 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) | |
379 | #define pr_notice(fmt, ...) \ | |
380 | printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) | |
381 | #define pr_info(fmt, ...) \ | |
382 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) | |
311d0761 CG |
383 | #define pr_cont(fmt, ...) \ |
384 | printk(KERN_CONT fmt, ##__VA_ARGS__) | |
1f7c8234 | 385 | |
4ccb4579 ME |
386 | /* pr_devel() should produce zero code unless DEBUG is defined */ |
387 | #ifdef DEBUG | |
388 | #define pr_devel(fmt, ...) \ | |
389 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | |
390 | #else | |
391 | #define pr_devel(fmt, ...) \ | |
392 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) | |
393 | #endif | |
394 | ||
1cc6daf2 | 395 | /* If you are writing a driver, please use dev_dbg instead */ |
d0d85ff9 CH |
396 | #if defined(DEBUG) |
397 | #define pr_debug(fmt, ...) \ | |
398 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | |
e9d376f0 | 399 | #elif defined(CONFIG_DYNAMIC_DEBUG) |
e6e66b02 | 400 | /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ |
346e15be | 401 | #define pr_debug(fmt, ...) do { \ |
e6e66b02 | 402 | dynamic_pr_debug(fmt, ##__VA_ARGS__); \ |
346e15be | 403 | } while (0) |
1da177e4 | 404 | #else |
d091c2f5 MS |
405 | #define pr_debug(fmt, ...) \ |
406 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) | |
1da177e4 LT |
407 | #endif |
408 | ||
526211bc IM |
409 | /* |
410 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
411 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
412 | * | |
413 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
414 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 415 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
416 | * file, which gives a means for the kernel and userspace to interact. |
417 | * Place a tracing_off() in the kernel where you want tracing to end. | |
418 | * From user space, examine the trace, and then echo 1 > tracing_on | |
419 | * to continue tracing. | |
420 | * | |
421 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
422 | * by things like suspend to ram where disabling the recording of the | |
423 | * trace is not enough, but tracing must actually stop because things | |
424 | * like calling smp_processor_id() may crash the system. | |
425 | * | |
426 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 427 | */ |
2002c258 SR |
428 | #ifdef CONFIG_RING_BUFFER |
429 | void tracing_on(void); | |
430 | void tracing_off(void); | |
431 | /* trace_off_permanent stops recording with no way to bring it back */ | |
432 | void tracing_off_permanent(void); | |
433 | int tracing_is_on(void); | |
434 | #else | |
435 | static inline void tracing_on(void) { } | |
436 | static inline void tracing_off(void) { } | |
437 | static inline void tracing_off_permanent(void) { } | |
438 | static inline int tracing_is_on(void) { return 0; } | |
439 | #endif | |
526211bc IM |
440 | #ifdef CONFIG_TRACING |
441 | extern void tracing_start(void); | |
442 | extern void tracing_stop(void); | |
443 | extern void ftrace_off_permanent(void); | |
444 | ||
445 | extern void | |
446 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); | |
447 | ||
769b0441 FW |
448 | static inline void __attribute__ ((format (printf, 1, 2))) |
449 | ____trace_printk_check_format(const char *fmt, ...) | |
450 | { | |
451 | } | |
452 | #define __trace_printk_check_format(fmt, args...) \ | |
453 | do { \ | |
454 | if (0) \ | |
455 | ____trace_printk_check_format(fmt, ##args); \ | |
456 | } while (0) | |
457 | ||
526211bc IM |
458 | /** |
459 | * trace_printk - printf formatting in the ftrace buffer | |
460 | * @fmt: the printf format for printing | |
461 | * | |
462 | * Note: __trace_printk is an internal function for trace_printk and | |
463 | * the @ip is passed in via the trace_printk macro. | |
464 | * | |
465 | * This function allows a kernel developer to debug fast path sections | |
466 | * that printk is not appropriate for. By scattering in various | |
467 | * printk like tracing in the code, a developer can quickly see | |
468 | * where problems are occurring. | |
469 | * | |
470 | * This is intended as a debugging tool for the developer only. | |
471 | * Please refrain from leaving trace_printks scattered around in | |
472 | * your code. | |
473 | */ | |
769b0441 FW |
474 | |
475 | #define trace_printk(fmt, args...) \ | |
476 | do { \ | |
769b0441 | 477 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 FW |
478 | if (__builtin_constant_p(fmt)) { \ |
479 | static const char *trace_printk_fmt \ | |
480 | __attribute__((section("__trace_printk_fmt"))) = \ | |
481 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
482 | \ | |
483 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ | |
484 | } else \ | |
485 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
486 | } while (0) |
487 | ||
48ead020 FW |
488 | extern int |
489 | __trace_bprintk(unsigned long ip, const char *fmt, ...) | |
490 | __attribute__ ((format (printf, 2, 3))); | |
491 | ||
526211bc IM |
492 | extern int |
493 | __trace_printk(unsigned long ip, const char *fmt, ...) | |
494 | __attribute__ ((format (printf, 2, 3))); | |
769b0441 | 495 | |
48ead020 FW |
496 | /* |
497 | * The double __builtin_constant_p is because gcc will give us an error | |
498 | * if we try to allocate the static variable to fmt if it is not a | |
499 | * constant. Even with the outer if statement. | |
500 | */ | |
769b0441 FW |
501 | #define ftrace_vprintk(fmt, vargs) \ |
502 | do { \ | |
48ead020 FW |
503 | if (__builtin_constant_p(fmt)) { \ |
504 | static const char *trace_printk_fmt \ | |
505 | __attribute__((section("__trace_printk_fmt"))) = \ | |
506 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 507 | \ |
48ead020 FW |
508 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
509 | } else \ | |
510 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
511 | } while (0) |
512 | ||
48ead020 FW |
513 | extern int |
514 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); | |
515 | ||
526211bc IM |
516 | extern int |
517 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); | |
769b0441 | 518 | |
526211bc IM |
519 | extern void ftrace_dump(void); |
520 | #else | |
521 | static inline void | |
522 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } | |
523 | static inline int | |
524 | trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); | |
525 | ||
526 | static inline void tracing_start(void) { } | |
527 | static inline void tracing_stop(void) { } | |
528 | static inline void ftrace_off_permanent(void) { } | |
529 | static inline int | |
530 | trace_printk(const char *fmt, ...) | |
531 | { | |
532 | return 0; | |
533 | } | |
534 | static inline int | |
535 | ftrace_vprintk(const char *fmt, va_list ap) | |
536 | { | |
537 | return 0; | |
538 | } | |
539 | static inline void ftrace_dump(void) { } | |
769b0441 | 540 | #endif /* CONFIG_TRACING */ |
526211bc | 541 | |
1da177e4 LT |
542 | /* |
543 | * Display an IP address in readable format. | |
544 | */ | |
545 | ||
546 | #define NIPQUAD(addr) \ | |
547 | ((unsigned char *)&addr)[0], \ | |
548 | ((unsigned char *)&addr)[1], \ | |
549 | ((unsigned char *)&addr)[2], \ | |
550 | ((unsigned char *)&addr)[3] | |
46b86a2d | 551 | #define NIPQUAD_FMT "%u.%u.%u.%u" |
1da177e4 | 552 | |
1da177e4 | 553 | /* |
bdf4bbaa | 554 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
555 | * strict type-checking.. See the |
556 | * "unnecessary" pointer comparison. | |
557 | */ | |
bdf4bbaa HH |
558 | #define min(x, y) ({ \ |
559 | typeof(x) _min1 = (x); \ | |
560 | typeof(y) _min2 = (y); \ | |
561 | (void) (&_min1 == &_min2); \ | |
562 | _min1 < _min2 ? _min1 : _min2; }) | |
563 | ||
564 | #define max(x, y) ({ \ | |
565 | typeof(x) _max1 = (x); \ | |
566 | typeof(y) _max2 = (y); \ | |
567 | (void) (&_max1 == &_max2); \ | |
568 | _max1 > _max2 ? _max1 : _max2; }) | |
569 | ||
570 | /** | |
571 | * clamp - return a value clamped to a given range with strict typechecking | |
572 | * @val: current value | |
573 | * @min: minimum allowable value | |
574 | * @max: maximum allowable value | |
575 | * | |
576 | * This macro does strict typechecking of min/max to make sure they are of the | |
577 | * same type as val. See the unnecessary pointer comparisons. | |
578 | */ | |
579 | #define clamp(val, min, max) ({ \ | |
580 | typeof(val) __val = (val); \ | |
581 | typeof(min) __min = (min); \ | |
582 | typeof(max) __max = (max); \ | |
583 | (void) (&__val == &__min); \ | |
584 | (void) (&__val == &__max); \ | |
585 | __val = __val < __min ? __min: __val; \ | |
586 | __val > __max ? __max: __val; }) | |
1da177e4 LT |
587 | |
588 | /* | |
589 | * ..and if you can't take the strict | |
590 | * types, you can specify one yourself. | |
591 | * | |
bdf4bbaa HH |
592 | * Or not use min/max/clamp at all, of course. |
593 | */ | |
594 | #define min_t(type, x, y) ({ \ | |
595 | type __min1 = (x); \ | |
596 | type __min2 = (y); \ | |
597 | __min1 < __min2 ? __min1: __min2; }) | |
598 | ||
599 | #define max_t(type, x, y) ({ \ | |
600 | type __max1 = (x); \ | |
601 | type __max2 = (y); \ | |
602 | __max1 > __max2 ? __max1: __max2; }) | |
603 | ||
604 | /** | |
605 | * clamp_t - return a value clamped to a given range using a given type | |
606 | * @type: the type of variable to use | |
607 | * @val: current value | |
608 | * @min: minimum allowable value | |
609 | * @max: maximum allowable value | |
610 | * | |
611 | * This macro does no typechecking and uses temporary variables of type | |
612 | * 'type' to make all the comparisons. | |
1da177e4 | 613 | */ |
bdf4bbaa HH |
614 | #define clamp_t(type, val, min, max) ({ \ |
615 | type __val = (val); \ | |
616 | type __min = (min); \ | |
617 | type __max = (max); \ | |
618 | __val = __val < __min ? __min: __val; \ | |
619 | __val > __max ? __max: __val; }) | |
1da177e4 | 620 | |
bdf4bbaa HH |
621 | /** |
622 | * clamp_val - return a value clamped to a given range using val's type | |
623 | * @val: current value | |
624 | * @min: minimum allowable value | |
625 | * @max: maximum allowable value | |
626 | * | |
627 | * This macro does no typechecking and uses temporary variables of whatever | |
628 | * type the input argument 'val' is. This is useful when val is an unsigned | |
629 | * type and min and max are literals that will otherwise be assigned a signed | |
630 | * integer type. | |
631 | */ | |
632 | #define clamp_val(val, min, max) ({ \ | |
633 | typeof(val) __val = (val); \ | |
634 | typeof(val) __min = (min); \ | |
635 | typeof(val) __max = (max); \ | |
636 | __val = __val < __min ? __min: __val; \ | |
637 | __val > __max ? __max: __val; }) | |
1da177e4 | 638 | |
91f68b73 WF |
639 | |
640 | /* | |
641 | * swap - swap value of @a and @b | |
642 | */ | |
ac7b9004 PZ |
643 | #define swap(a, b) \ |
644 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 645 | |
1da177e4 LT |
646 | /** |
647 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
648 | * @ptr: the pointer to the member. |
649 | * @type: the type of the container struct this is embedded in. | |
650 | * @member: the name of the member within the struct. | |
651 | * | |
652 | */ | |
653 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
654 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
655 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 | 656 | |
d4d23add KM |
657 | struct sysinfo; |
658 | extern int do_sysinfo(struct sysinfo *info); | |
659 | ||
1da177e4 LT |
660 | #endif /* __KERNEL__ */ |
661 | ||
662 | #define SI_LOAD_SHIFT 16 | |
663 | struct sysinfo { | |
664 | long uptime; /* Seconds since boot */ | |
665 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ | |
666 | unsigned long totalram; /* Total usable main memory size */ | |
667 | unsigned long freeram; /* Available memory size */ | |
668 | unsigned long sharedram; /* Amount of shared memory */ | |
669 | unsigned long bufferram; /* Memory used by buffers */ | |
670 | unsigned long totalswap; /* Total swap space size */ | |
671 | unsigned long freeswap; /* swap space still available */ | |
672 | unsigned short procs; /* Number of current processes */ | |
673 | unsigned short pad; /* explicit padding for m68k */ | |
674 | unsigned long totalhigh; /* Total high memory size */ | |
675 | unsigned long freehigh; /* Available high memory size */ | |
676 | unsigned int mem_unit; /* Memory unit size in bytes */ | |
677 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ | |
678 | }; | |
679 | ||
c0398ee6 | 680 | /* Force a compilation error if condition is true */ |
921717a2 | 681 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
1da177e4 | 682 | |
4552d5dc JB |
683 | /* Force a compilation error if condition is true, but also produce a |
684 | result (of value 0 and type size_t), so the expression can be used | |
685 | e.g. in a structure initializer (or where-ever else comma expressions | |
686 | aren't permitted). */ | |
687 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) | |
688 | ||
1da177e4 | 689 | /* Trap pasters of __FUNCTION__ at compile-time */ |
1da177e4 | 690 | #define __FUNCTION__ (__func__) |
1da177e4 | 691 | |
08e0f6a9 CL |
692 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
693 | #ifdef CONFIG_NUMA | |
694 | #define NUMA_BUILD 1 | |
695 | #else | |
696 | #define NUMA_BUILD 0 | |
697 | #endif | |
698 | ||
29e71abf SR |
699 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
700 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
701 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
702 | #endif | |
703 | ||
1da177e4 | 704 | #endif |