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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 | ||
2da96acd JA |
61 | #ifdef CONFIG_LBD |
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 | ||
47492527 IM |
100 | /* |
101 | * Annotation for a "continued" line of log printout (only done after a | |
102 | * line that had no enclosing \n). Only to be used by core/arch code | |
103 | * during early bootup (a continued line is not SMP-safe otherwise). | |
104 | */ | |
105 | #define KERN_CONT "" | |
106 | ||
1da177e4 LT |
107 | extern int console_printk[]; |
108 | ||
109 | #define console_loglevel (console_printk[0]) | |
110 | #define default_message_loglevel (console_printk[1]) | |
111 | #define minimum_console_loglevel (console_printk[2]) | |
112 | #define default_console_loglevel (console_printk[3]) | |
113 | ||
114 | struct completion; | |
df2e71fb | 115 | struct pt_regs; |
116 | struct user; | |
1da177e4 | 117 | |
070cb065 UKK |
118 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
119 | extern int _cond_resched(void); | |
120 | # define might_resched() _cond_resched() | |
121 | #else | |
122 | # define might_resched() do { } while (0) | |
123 | #endif | |
124 | ||
7106a27b RD |
125 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
126 | void __might_sleep(char *file, int line); | |
1da177e4 LT |
127 | /** |
128 | * might_sleep - annotation for functions that can sleep | |
129 | * | |
130 | * this macro will print a stack trace if it is executed in an atomic | |
131 | * context (spinlock, irq-handler, ...). | |
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 IM |
137 | # define might_sleep() \ |
138 | do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) | |
1da177e4 | 139 | #else |
f8cbd99b | 140 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
141 | #endif |
142 | ||
368a5fa1 | 143 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 144 | |
1da177e4 LT |
145 | #define abs(x) ({ \ |
146 | int __x = (x); \ | |
147 | (__x < 0) ? -__x : __x; \ | |
148 | }) | |
149 | ||
3ee1afa3 NP |
150 | #ifdef CONFIG_PROVE_LOCKING |
151 | void might_fault(void); | |
152 | #else | |
153 | static inline void might_fault(void) | |
154 | { | |
155 | might_sleep(); | |
156 | } | |
157 | #endif | |
158 | ||
e041c683 | 159 | extern struct atomic_notifier_head panic_notifier_list; |
1da177e4 LT |
160 | extern long (*panic_blink)(long time); |
161 | NORET_TYPE void panic(const char * fmt, ...) | |
a586df06 | 162 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
dd287796 AM |
163 | extern void oops_enter(void); |
164 | extern void oops_exit(void); | |
165 | extern int oops_may_print(void); | |
ec701584 | 166 | NORET_TYPE void do_exit(long error_code) |
1da177e4 LT |
167 | ATTRIB_NORET; |
168 | NORET_TYPE void complete_and_exit(struct completion *, long) | |
169 | ATTRIB_NORET; | |
170 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); | |
171 | extern long simple_strtol(const char *,char **,unsigned int); | |
172 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
173 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
06b2a76d YY |
174 | extern int strict_strtoul(const char *, unsigned int, unsigned long *); |
175 | extern int strict_strtol(const char *, unsigned int, long *); | |
176 | extern int strict_strtoull(const char *, unsigned int, unsigned long long *); | |
177 | extern int strict_strtoll(const char *, unsigned int, long long *); | |
1da177e4 LT |
178 | extern int sprintf(char * buf, const char * fmt, ...) |
179 | __attribute__ ((format (printf, 2, 3))); | |
180 | extern int vsprintf(char *buf, const char *, va_list) | |
181 | __attribute__ ((format (printf, 2, 0))); | |
182 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) | |
183 | __attribute__ ((format (printf, 3, 4))); | |
184 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
185 | __attribute__ ((format (printf, 3, 0))); | |
186 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) | |
187 | __attribute__ ((format (printf, 3, 4))); | |
188 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
189 | __attribute__ ((format (printf, 3, 0))); | |
e905914f JF |
190 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
191 | __attribute__ ((format (printf, 2, 3))); | |
11443ec7 | 192 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
1da177e4 LT |
193 | |
194 | extern int sscanf(const char *, const char *, ...) | |
195 | __attribute__ ((format (scanf, 2, 3))); | |
196 | extern int vsscanf(const char *, const char *, va_list) | |
197 | __attribute__ ((format (scanf, 2, 0))); | |
198 | ||
199 | extern int get_option(char **str, int *pint); | |
200 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 201 | extern unsigned long long memparse(const char *ptr, char **retptr); |
1da177e4 | 202 | |
5e376613 | 203 | extern int core_kernel_text(unsigned long addr); |
1da177e4 LT |
204 | extern int __kernel_text_address(unsigned long addr); |
205 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 206 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 207 | |
04a2e6a5 EB |
208 | struct pid; |
209 | extern struct pid *session_of_pgrp(struct pid *pgrp); | |
1da177e4 | 210 | |
a0ad05c7 TR |
211 | /* |
212 | * FW_BUG | |
213 | * Add this to a message where you are sure the firmware is buggy or behaves | |
214 | * really stupid or out of spec. Be aware that the responsible BIOS developer | |
215 | * should be able to fix this issue or at least get a concrete idea of the | |
216 | * problem by reading your message without the need of looking at the kernel | |
217 | * code. | |
218 | * | |
219 | * Use it for definite and high priority BIOS bugs. | |
220 | * | |
221 | * FW_WARN | |
222 | * Use it for not that clear (e.g. could the kernel messed up things already?) | |
223 | * and medium priority BIOS bugs. | |
224 | * | |
225 | * FW_INFO | |
226 | * Use this one if you want to tell the user or vendor about something | |
227 | * suspicious, but generally harmless related to the firmware. | |
228 | * | |
229 | * Use it for information or very low priority BIOS bugs. | |
230 | */ | |
231 | #define FW_BUG "[Firmware Bug]: " | |
232 | #define FW_WARN "[Firmware Warn]: " | |
233 | #define FW_INFO "[Firmware Info]: " | |
234 | ||
d59745ce | 235 | #ifdef CONFIG_PRINTK |
1da177e4 LT |
236 | asmlinkage int vprintk(const char *fmt, va_list args) |
237 | __attribute__ ((format (printf, 1, 0))); | |
238 | asmlinkage int printk(const char * fmt, ...) | |
a586df06 | 239 | __attribute__ ((format (printf, 1, 2))) __cold; |
7ef3d2fd | 240 | |
717115e1 | 241 | extern struct ratelimit_state printk_ratelimit_state; |
7ef3d2fd | 242 | extern int printk_ratelimit(void); |
7ef3d2fd JP |
243 | extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, |
244 | unsigned int interval_msec); | |
d59745ce MM |
245 | #else |
246 | static inline int vprintk(const char *s, va_list args) | |
247 | __attribute__ ((format (printf, 1, 0))); | |
248 | static inline int vprintk(const char *s, va_list args) { return 0; } | |
249 | static inline int printk(const char *s, ...) | |
250 | __attribute__ ((format (printf, 1, 2))); | |
a586df06 | 251 | static inline int __cold printk(const char *s, ...) { return 0; } |
7ef3d2fd | 252 | static inline int printk_ratelimit(void) { return 0; } |
7ef3d2fd JP |
253 | static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ |
254 | unsigned int interval_msec) \ | |
255 | { return false; } | |
d59745ce | 256 | #endif |
1da177e4 | 257 | |
ced9cd40 IM |
258 | extern int printk_needs_cpu(int cpu); |
259 | extern void printk_tick(void); | |
260 | ||
e17ba73b | 261 | extern void asmlinkage __attribute__((format(printf, 1, 2))) |
076f9776 IM |
262 | early_printk(const char *fmt, ...); |
263 | ||
1da177e4 LT |
264 | unsigned long int_sqrt(unsigned long); |
265 | ||
1da177e4 LT |
266 | static inline void console_silent(void) |
267 | { | |
268 | console_loglevel = 0; | |
269 | } | |
270 | ||
271 | static inline void console_verbose(void) | |
272 | { | |
273 | if (console_loglevel) | |
274 | console_loglevel = 15; | |
275 | } | |
276 | ||
277 | extern void bust_spinlocks(int yes); | |
e3e8a75d | 278 | extern void wake_up_klogd(void); |
1da177e4 | 279 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
aa727107 | 280 | extern int panic_timeout; |
1da177e4 | 281 | extern int panic_on_oops; |
8da5adda | 282 | extern int panic_on_unrecovered_nmi; |
1da177e4 | 283 | extern const char *print_tainted(void); |
25ddbb18 AK |
284 | extern void add_taint(unsigned flag); |
285 | extern int test_taint(unsigned flag); | |
286 | extern unsigned long get_taint(void); | |
b920de1b | 287 | extern int root_mountflags; |
1da177e4 LT |
288 | |
289 | /* Values used for system_state */ | |
290 | extern enum system_states { | |
291 | SYSTEM_BOOTING, | |
292 | SYSTEM_RUNNING, | |
293 | SYSTEM_HALT, | |
294 | SYSTEM_POWER_OFF, | |
295 | SYSTEM_RESTART, | |
729b4d4c | 296 | SYSTEM_SUSPEND_DISK, |
1da177e4 LT |
297 | } system_state; |
298 | ||
25ddbb18 AK |
299 | #define TAINT_PROPRIETARY_MODULE 0 |
300 | #define TAINT_FORCED_MODULE 1 | |
301 | #define TAINT_UNSAFE_SMP 2 | |
302 | #define TAINT_FORCED_RMMOD 3 | |
303 | #define TAINT_MACHINE_CHECK 4 | |
304 | #define TAINT_BAD_PAGE 5 | |
305 | #define TAINT_USER 6 | |
306 | #define TAINT_DIE 7 | |
307 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
308 | #define TAINT_WARN 9 | |
26e9a397 | 309 | #define TAINT_CRAP 10 |
1da177e4 | 310 | |
a586df06 | 311 | extern void dump_stack(void) __cold; |
1da177e4 | 312 | |
99eaf3c4 RD |
313 | enum { |
314 | DUMP_PREFIX_NONE, | |
315 | DUMP_PREFIX_ADDRESS, | |
316 | DUMP_PREFIX_OFFSET | |
317 | }; | |
c7909234 RD |
318 | extern void hex_dump_to_buffer(const void *buf, size_t len, |
319 | int rowsize, int groupsize, | |
320 | char *linebuf, size_t linebuflen, bool ascii); | |
321 | extern void print_hex_dump(const char *level, const char *prefix_str, | |
322 | int prefix_type, int rowsize, int groupsize, | |
6a0ed91e | 323 | const void *buf, size_t len, bool ascii); |
c7909234 | 324 | extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
eb9a9a56 | 325 | const void *buf, size_t len); |
3fc95772 HH |
326 | |
327 | extern const char hex_asc[]; | |
328 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
329 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
330 | ||
331 | static inline char *pack_hex_byte(char *buf, u8 byte) | |
332 | { | |
333 | *buf++ = hex_asc_hi(byte); | |
334 | *buf++ = hex_asc_lo(byte); | |
335 | return buf; | |
336 | } | |
99eaf3c4 | 337 | |
d091c2f5 MS |
338 | #ifndef pr_fmt |
339 | #define pr_fmt(fmt) fmt | |
340 | #endif | |
341 | ||
342 | #define pr_emerg(fmt, ...) \ | |
343 | printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) | |
344 | #define pr_alert(fmt, ...) \ | |
345 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) | |
346 | #define pr_crit(fmt, ...) \ | |
347 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) | |
348 | #define pr_err(fmt, ...) \ | |
349 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | |
350 | #define pr_warning(fmt, ...) \ | |
351 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) | |
352 | #define pr_notice(fmt, ...) \ | |
353 | printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) | |
354 | #define pr_info(fmt, ...) \ | |
355 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) | |
1f7c8234 | 356 | |
1cc6daf2 | 357 | /* If you are writing a driver, please use dev_dbg instead */ |
d0d85ff9 CH |
358 | #if defined(DEBUG) |
359 | #define pr_debug(fmt, ...) \ | |
360 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | |
e9d376f0 | 361 | #elif defined(CONFIG_DYNAMIC_DEBUG) |
e6e66b02 | 362 | /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ |
346e15be | 363 | #define pr_debug(fmt, ...) do { \ |
e6e66b02 | 364 | dynamic_pr_debug(fmt, ##__VA_ARGS__); \ |
346e15be | 365 | } while (0) |
1da177e4 | 366 | #else |
d091c2f5 MS |
367 | #define pr_debug(fmt, ...) \ |
368 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) | |
1da177e4 LT |
369 | #endif |
370 | ||
1da177e4 LT |
371 | /* |
372 | * Display an IP address in readable format. | |
373 | */ | |
374 | ||
375 | #define NIPQUAD(addr) \ | |
376 | ((unsigned char *)&addr)[0], \ | |
377 | ((unsigned char *)&addr)[1], \ | |
378 | ((unsigned char *)&addr)[2], \ | |
379 | ((unsigned char *)&addr)[3] | |
46b86a2d | 380 | #define NIPQUAD_FMT "%u.%u.%u.%u" |
1da177e4 | 381 | |
1da177e4 | 382 | /* |
bdf4bbaa | 383 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
384 | * strict type-checking.. See the |
385 | * "unnecessary" pointer comparison. | |
386 | */ | |
bdf4bbaa HH |
387 | #define min(x, y) ({ \ |
388 | typeof(x) _min1 = (x); \ | |
389 | typeof(y) _min2 = (y); \ | |
390 | (void) (&_min1 == &_min2); \ | |
391 | _min1 < _min2 ? _min1 : _min2; }) | |
392 | ||
393 | #define max(x, y) ({ \ | |
394 | typeof(x) _max1 = (x); \ | |
395 | typeof(y) _max2 = (y); \ | |
396 | (void) (&_max1 == &_max2); \ | |
397 | _max1 > _max2 ? _max1 : _max2; }) | |
398 | ||
399 | /** | |
400 | * clamp - return a value clamped to a given range with strict typechecking | |
401 | * @val: current value | |
402 | * @min: minimum allowable value | |
403 | * @max: maximum allowable value | |
404 | * | |
405 | * This macro does strict typechecking of min/max to make sure they are of the | |
406 | * same type as val. See the unnecessary pointer comparisons. | |
407 | */ | |
408 | #define clamp(val, min, max) ({ \ | |
409 | typeof(val) __val = (val); \ | |
410 | typeof(min) __min = (min); \ | |
411 | typeof(max) __max = (max); \ | |
412 | (void) (&__val == &__min); \ | |
413 | (void) (&__val == &__max); \ | |
414 | __val = __val < __min ? __min: __val; \ | |
415 | __val > __max ? __max: __val; }) | |
1da177e4 LT |
416 | |
417 | /* | |
418 | * ..and if you can't take the strict | |
419 | * types, you can specify one yourself. | |
420 | * | |
bdf4bbaa HH |
421 | * Or not use min/max/clamp at all, of course. |
422 | */ | |
423 | #define min_t(type, x, y) ({ \ | |
424 | type __min1 = (x); \ | |
425 | type __min2 = (y); \ | |
426 | __min1 < __min2 ? __min1: __min2; }) | |
427 | ||
428 | #define max_t(type, x, y) ({ \ | |
429 | type __max1 = (x); \ | |
430 | type __max2 = (y); \ | |
431 | __max1 > __max2 ? __max1: __max2; }) | |
432 | ||
433 | /** | |
434 | * clamp_t - return a value clamped to a given range using a given type | |
435 | * @type: the type of variable to use | |
436 | * @val: current value | |
437 | * @min: minimum allowable value | |
438 | * @max: maximum allowable value | |
439 | * | |
440 | * This macro does no typechecking and uses temporary variables of type | |
441 | * 'type' to make all the comparisons. | |
1da177e4 | 442 | */ |
bdf4bbaa HH |
443 | #define clamp_t(type, val, min, max) ({ \ |
444 | type __val = (val); \ | |
445 | type __min = (min); \ | |
446 | type __max = (max); \ | |
447 | __val = __val < __min ? __min: __val; \ | |
448 | __val > __max ? __max: __val; }) | |
1da177e4 | 449 | |
bdf4bbaa HH |
450 | /** |
451 | * clamp_val - return a value clamped to a given range using val's type | |
452 | * @val: current value | |
453 | * @min: minimum allowable value | |
454 | * @max: maximum allowable value | |
455 | * | |
456 | * This macro does no typechecking and uses temporary variables of whatever | |
457 | * type the input argument 'val' is. This is useful when val is an unsigned | |
458 | * type and min and max are literals that will otherwise be assigned a signed | |
459 | * integer type. | |
460 | */ | |
461 | #define clamp_val(val, min, max) ({ \ | |
462 | typeof(val) __val = (val); \ | |
463 | typeof(val) __min = (min); \ | |
464 | typeof(val) __max = (max); \ | |
465 | __val = __val < __min ? __min: __val; \ | |
466 | __val > __max ? __max: __val; }) | |
1da177e4 | 467 | |
91f68b73 WF |
468 | |
469 | /* | |
470 | * swap - swap value of @a and @b | |
471 | */ | |
ac7b9004 PZ |
472 | #define swap(a, b) \ |
473 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 474 | |
1da177e4 LT |
475 | /** |
476 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
477 | * @ptr: the pointer to the member. |
478 | * @type: the type of the container struct this is embedded in. | |
479 | * @member: the name of the member within the struct. | |
480 | * | |
481 | */ | |
482 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
483 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
484 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 | 485 | |
d4d23add KM |
486 | struct sysinfo; |
487 | extern int do_sysinfo(struct sysinfo *info); | |
488 | ||
1da177e4 LT |
489 | #endif /* __KERNEL__ */ |
490 | ||
491 | #define SI_LOAD_SHIFT 16 | |
492 | struct sysinfo { | |
493 | long uptime; /* Seconds since boot */ | |
494 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ | |
495 | unsigned long totalram; /* Total usable main memory size */ | |
496 | unsigned long freeram; /* Available memory size */ | |
497 | unsigned long sharedram; /* Amount of shared memory */ | |
498 | unsigned long bufferram; /* Memory used by buffers */ | |
499 | unsigned long totalswap; /* Total swap space size */ | |
500 | unsigned long freeswap; /* swap space still available */ | |
501 | unsigned short procs; /* Number of current processes */ | |
502 | unsigned short pad; /* explicit padding for m68k */ | |
503 | unsigned long totalhigh; /* Total high memory size */ | |
504 | unsigned long freehigh; /* Available high memory size */ | |
505 | unsigned int mem_unit; /* Memory unit size in bytes */ | |
506 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ | |
507 | }; | |
508 | ||
c0398ee6 | 509 | /* Force a compilation error if condition is true */ |
921717a2 | 510 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
1da177e4 | 511 | |
4552d5dc JB |
512 | /* Force a compilation error if condition is true, but also produce a |
513 | result (of value 0 and type size_t), so the expression can be used | |
514 | e.g. in a structure initializer (or where-ever else comma expressions | |
515 | aren't permitted). */ | |
516 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) | |
517 | ||
1da177e4 | 518 | /* Trap pasters of __FUNCTION__ at compile-time */ |
1da177e4 | 519 | #define __FUNCTION__ (__func__) |
1da177e4 | 520 | |
08e0f6a9 CL |
521 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
522 | #ifdef CONFIG_NUMA | |
523 | #define NUMA_BUILD 1 | |
524 | #else | |
525 | #define NUMA_BUILD 0 | |
526 | #endif | |
527 | ||
29e71abf SR |
528 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
529 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
530 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
531 | #endif | |
532 | ||
1da177e4 | 533 | #endif |