]>
Commit | Line | Data |
---|---|---|
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 | */ | |
a79ff731 AD |
7 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) |
8 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) | |
1da177e4 LT |
9 | |
10 | #ifdef __KERNEL__ | |
11 | ||
12 | #include <stdarg.h> | |
13 | #include <linux/linkage.h> | |
14 | #include <linux/stddef.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/compiler.h> | |
17 | #include <linux/bitops.h> | |
f0d1b0b3 | 18 | #include <linux/log2.h> |
e0deaff4 | 19 | #include <linux/typecheck.h> |
968ab183 | 20 | #include <linux/printk.h> |
e9d376f0 | 21 | #include <linux/dynamic_debug.h> |
1da177e4 LT |
22 | #include <asm/byteorder.h> |
23 | #include <asm/bug.h> | |
24 | ||
4be929be AD |
25 | #define USHRT_MAX ((u16)(~0U)) |
26 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) | |
27 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) | |
1da177e4 LT |
28 | #define INT_MAX ((int)(~0U>>1)) |
29 | #define INT_MIN (-INT_MAX - 1) | |
30 | #define UINT_MAX (~0U) | |
31 | #define LONG_MAX ((long)(~0UL>>1)) | |
32 | #define LONG_MIN (-LONG_MAX - 1) | |
33 | #define ULONG_MAX (~0UL) | |
111ebb6e OH |
34 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
35 | #define LLONG_MIN (-LLONG_MAX - 1) | |
36 | #define ULLONG_MAX (~0ULL) | |
1da177e4 LT |
37 | |
38 | #define STACK_MAGIC 0xdeadbeef | |
39 | ||
a79ff731 | 40 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
9f93ff5b | 41 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
a83308e6 | 42 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 43 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 44 | |
c5e631cf RR |
45 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
46 | ||
9b3be9f9 YL |
47 | /* |
48 | * This looks more complex than it should be. But we need to | |
49 | * get the type for the ~ right in round_down (it needs to be | |
50 | * as wide as the result!), and we want to evaluate the macro | |
51 | * arguments just once each. | |
52 | */ | |
53 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | |
54 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | |
55 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | |
56 | ||
4552d5dc | 57 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
930631ed | 58 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
074e61ec JM |
59 | |
60 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | |
b28efd54 EP |
61 | #define roundup(x, y) ( \ |
62 | { \ | |
6070bf35 | 63 | const typeof(y) __y = y; \ |
b28efd54 EP |
64 | (((x) + (__y - 1)) / __y) * __y; \ |
65 | } \ | |
66 | ) | |
686a0f3d EP |
67 | #define rounddown(x, y) ( \ |
68 | { \ | |
69 | typeof(x) __x = (x); \ | |
70 | __x - (__x % (y)); \ | |
71 | } \ | |
72 | ) | |
9fe06081 DW |
73 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
74 | { \ | |
75 | typeof(divisor) __divisor = divisor; \ | |
76 | (((x) + ((__divisor) / 2)) / (__divisor)); \ | |
77 | } \ | |
78 | ) | |
1da177e4 | 79 | |
ca31e146 EGM |
80 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
81 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) | |
82 | ||
90c699a9 | 83 | #ifdef CONFIG_LBDAF |
2da96acd JA |
84 | # include <asm/div64.h> |
85 | # define sector_div(a, b) do_div(a, b) | |
86 | #else | |
87 | # define sector_div(n, b)( \ | |
88 | { \ | |
89 | int _res; \ | |
90 | _res = (n) % (b); \ | |
91 | (n) /= (b); \ | |
92 | _res; \ | |
93 | } \ | |
94 | ) | |
95 | #endif | |
96 | ||
218e180e AM |
97 | /** |
98 | * upper_32_bits - return bits 32-63 of a number | |
99 | * @n: the number we're accessing | |
100 | * | |
101 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
102 | * the "right shift count >= width of type" warning when that quantity is | |
103 | * 32-bits. | |
104 | */ | |
105 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
106 | ||
204b885e JR |
107 | /** |
108 | * lower_32_bits - return bits 0-31 of a number | |
109 | * @n: the number we're accessing | |
110 | */ | |
111 | #define lower_32_bits(n) ((u32)(n)) | |
112 | ||
1da177e4 | 113 | struct completion; |
df2e71fb | 114 | struct pt_regs; |
115 | struct user; | |
1da177e4 | 116 | |
070cb065 UKK |
117 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
118 | extern int _cond_resched(void); | |
119 | # define might_resched() _cond_resched() | |
120 | #else | |
121 | # define might_resched() do { } while (0) | |
122 | #endif | |
123 | ||
7106a27b | 124 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
d894837f | 125 | void __might_sleep(const char *file, int line, int preempt_offset); |
1da177e4 LT |
126 | /** |
127 | * might_sleep - annotation for functions that can sleep | |
128 | * | |
129 | * this macro will print a stack trace if it is executed in an atomic | |
130 | * context (spinlock, irq-handler, ...). | |
131 | * | |
132 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 133 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
134 | * supposed to. |
135 | */ | |
f8cbd99b | 136 | # define might_sleep() \ |
e4aafea2 | 137 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
1da177e4 | 138 | #else |
d894837f SK |
139 | static inline void __might_sleep(const char *file, int line, |
140 | int preempt_offset) { } | |
f8cbd99b | 141 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
142 | #endif |
143 | ||
368a5fa1 | 144 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 145 | |
71a90484 AM |
146 | /* |
147 | * abs() handles unsigned and signed longs, ints, shorts and chars. For all | |
148 | * input types abs() returns a signed long. | |
149 | * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() | |
150 | * for those. | |
151 | */ | |
152 | #define abs(x) ({ \ | |
153 | long ret; \ | |
154 | if (sizeof(x) == sizeof(long)) { \ | |
155 | long __x = (x); \ | |
156 | ret = (__x < 0) ? -__x : __x; \ | |
157 | } else { \ | |
158 | int __x = (x); \ | |
159 | ret = (__x < 0) ? -__x : __x; \ | |
160 | } \ | |
161 | ret; \ | |
1da177e4 LT |
162 | }) |
163 | ||
658716d1 BB |
164 | #define abs64(x) ({ \ |
165 | s64 __x = (x); \ | |
166 | (__x < 0) ? -__x : __x; \ | |
167 | }) | |
168 | ||
3ee1afa3 NP |
169 | #ifdef CONFIG_PROVE_LOCKING |
170 | void might_fault(void); | |
171 | #else | |
172 | static inline void might_fault(void) | |
173 | { | |
174 | might_sleep(); | |
175 | } | |
176 | #endif | |
177 | ||
e041c683 | 178 | extern struct atomic_notifier_head panic_notifier_list; |
c7ff0d9c | 179 | extern long (*panic_blink)(int state); |
1da177e4 | 180 | NORET_TYPE void panic(const char * fmt, ...) |
a586df06 | 181 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
dd287796 AM |
182 | extern void oops_enter(void); |
183 | extern void oops_exit(void); | |
863a6049 | 184 | void print_oops_end_marker(void); |
dd287796 | 185 | extern int oops_may_print(void); |
ec701584 | 186 | NORET_TYPE void do_exit(long error_code) |
1da177e4 LT |
187 | ATTRIB_NORET; |
188 | NORET_TYPE void complete_and_exit(struct completion *, long) | |
189 | ATTRIB_NORET; | |
190 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); | |
191 | extern long simple_strtol(const char *,char **,unsigned int); | |
192 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
193 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
a55621f1 AM |
194 | extern int __must_check strict_strtoul(const char *, unsigned int, unsigned long *); |
195 | extern int __must_check strict_strtol(const char *, unsigned int, long *); | |
196 | extern int __must_check strict_strtoull(const char *, unsigned int, unsigned long long *); | |
197 | extern int __must_check strict_strtoll(const char *, unsigned int, long long *); | |
1da177e4 LT |
198 | extern int sprintf(char * buf, const char * fmt, ...) |
199 | __attribute__ ((format (printf, 2, 3))); | |
200 | extern int vsprintf(char *buf, const char *, va_list) | |
201 | __attribute__ ((format (printf, 2, 0))); | |
202 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) | |
203 | __attribute__ ((format (printf, 3, 4))); | |
204 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
205 | __attribute__ ((format (printf, 3, 0))); | |
206 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) | |
207 | __attribute__ ((format (printf, 3, 4))); | |
208 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
209 | __attribute__ ((format (printf, 3, 0))); | |
e905914f JF |
210 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
211 | __attribute__ ((format (printf, 2, 3))); | |
11443ec7 | 212 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
1da177e4 LT |
213 | |
214 | extern int sscanf(const char *, const char *, ...) | |
215 | __attribute__ ((format (scanf, 2, 3))); | |
216 | extern int vsscanf(const char *, const char *, va_list) | |
217 | __attribute__ ((format (scanf, 2, 0))); | |
218 | ||
219 | extern int get_option(char **str, int *pint); | |
220 | extern char *get_options(const char *str, int nints, int *ints); | |
d974ae37 | 221 | extern unsigned long long memparse(const char *ptr, char **retptr); |
1da177e4 | 222 | |
5e376613 | 223 | extern int core_kernel_text(unsigned long addr); |
1da177e4 LT |
224 | extern int __kernel_text_address(unsigned long addr); |
225 | extern int kernel_text_address(unsigned long addr); | |
ab7476cf | 226 | extern int func_ptr_is_kernel_text(void *ptr); |
ab7476cf | 227 | |
04a2e6a5 EB |
228 | struct pid; |
229 | extern struct pid *session_of_pgrp(struct pid *pgrp); | |
1da177e4 | 230 | |
1da177e4 LT |
231 | unsigned long int_sqrt(unsigned long); |
232 | ||
1da177e4 | 233 | extern void bust_spinlocks(int yes); |
e3e8a75d | 234 | extern void wake_up_klogd(void); |
1da177e4 | 235 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
aa727107 | 236 | extern int panic_timeout; |
1da177e4 | 237 | extern int panic_on_oops; |
8da5adda | 238 | extern int panic_on_unrecovered_nmi; |
5211a242 | 239 | extern int panic_on_io_nmi; |
1da177e4 | 240 | extern const char *print_tainted(void); |
25ddbb18 AK |
241 | extern void add_taint(unsigned flag); |
242 | extern int test_taint(unsigned flag); | |
243 | extern unsigned long get_taint(void); | |
b920de1b | 244 | extern int root_mountflags; |
1da177e4 | 245 | |
2ce802f6 TH |
246 | extern bool early_boot_irqs_disabled; |
247 | ||
1da177e4 LT |
248 | /* Values used for system_state */ |
249 | extern enum system_states { | |
250 | SYSTEM_BOOTING, | |
251 | SYSTEM_RUNNING, | |
252 | SYSTEM_HALT, | |
253 | SYSTEM_POWER_OFF, | |
254 | SYSTEM_RESTART, | |
729b4d4c | 255 | SYSTEM_SUSPEND_DISK, |
1da177e4 LT |
256 | } system_state; |
257 | ||
25ddbb18 AK |
258 | #define TAINT_PROPRIETARY_MODULE 0 |
259 | #define TAINT_FORCED_MODULE 1 | |
260 | #define TAINT_UNSAFE_SMP 2 | |
261 | #define TAINT_FORCED_RMMOD 3 | |
262 | #define TAINT_MACHINE_CHECK 4 | |
263 | #define TAINT_BAD_PAGE 5 | |
264 | #define TAINT_USER 6 | |
265 | #define TAINT_DIE 7 | |
266 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 | |
267 | #define TAINT_WARN 9 | |
26e9a397 | 268 | #define TAINT_CRAP 10 |
92946bc7 | 269 | #define TAINT_FIRMWARE_WORKAROUND 11 |
1da177e4 | 270 | |
3fc95772 HH |
271 | extern const char hex_asc[]; |
272 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] | |
273 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] | |
274 | ||
275 | static inline char *pack_hex_byte(char *buf, u8 byte) | |
276 | { | |
277 | *buf++ = hex_asc_hi(byte); | |
278 | *buf++ = hex_asc_lo(byte); | |
279 | return buf; | |
280 | } | |
99eaf3c4 | 281 | |
90378889 | 282 | extern int hex_to_bin(char ch); |
dc88e460 | 283 | extern void hex2bin(u8 *dst, const char *src, size_t count); |
90378889 | 284 | |
526211bc IM |
285 | /* |
286 | * General tracing related utility functions - trace_printk(), | |
2002c258 SR |
287 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
288 | * | |
289 | * Use tracing_on/tracing_off when you want to quickly turn on or off | |
290 | * tracing. It simply enables or disables the recording of the trace events. | |
156f5a78 | 291 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
2002c258 SR |
292 | * file, which gives a means for the kernel and userspace to interact. |
293 | * Place a tracing_off() in the kernel where you want tracing to end. | |
294 | * From user space, examine the trace, and then echo 1 > tracing_on | |
295 | * to continue tracing. | |
296 | * | |
297 | * tracing_stop/tracing_start has slightly more overhead. It is used | |
298 | * by things like suspend to ram where disabling the recording of the | |
299 | * trace is not enough, but tracing must actually stop because things | |
300 | * like calling smp_processor_id() may crash the system. | |
301 | * | |
302 | * Most likely, you want to use tracing_on/tracing_off. | |
526211bc | 303 | */ |
2002c258 SR |
304 | #ifdef CONFIG_RING_BUFFER |
305 | void tracing_on(void); | |
306 | void tracing_off(void); | |
307 | /* trace_off_permanent stops recording with no way to bring it back */ | |
308 | void tracing_off_permanent(void); | |
309 | int tracing_is_on(void); | |
310 | #else | |
311 | static inline void tracing_on(void) { } | |
312 | static inline void tracing_off(void) { } | |
313 | static inline void tracing_off_permanent(void) { } | |
314 | static inline int tracing_is_on(void) { return 0; } | |
315 | #endif | |
cecbca96 FW |
316 | |
317 | enum ftrace_dump_mode { | |
318 | DUMP_NONE, | |
319 | DUMP_ALL, | |
320 | DUMP_ORIG, | |
321 | }; | |
322 | ||
526211bc IM |
323 | #ifdef CONFIG_TRACING |
324 | extern void tracing_start(void); | |
325 | extern void tracing_stop(void); | |
326 | extern void ftrace_off_permanent(void); | |
327 | ||
769b0441 FW |
328 | static inline void __attribute__ ((format (printf, 1, 2))) |
329 | ____trace_printk_check_format(const char *fmt, ...) | |
330 | { | |
331 | } | |
332 | #define __trace_printk_check_format(fmt, args...) \ | |
333 | do { \ | |
334 | if (0) \ | |
335 | ____trace_printk_check_format(fmt, ##args); \ | |
336 | } while (0) | |
337 | ||
526211bc IM |
338 | /** |
339 | * trace_printk - printf formatting in the ftrace buffer | |
340 | * @fmt: the printf format for printing | |
341 | * | |
342 | * Note: __trace_printk is an internal function for trace_printk and | |
343 | * the @ip is passed in via the trace_printk macro. | |
344 | * | |
345 | * This function allows a kernel developer to debug fast path sections | |
346 | * that printk is not appropriate for. By scattering in various | |
347 | * printk like tracing in the code, a developer can quickly see | |
348 | * where problems are occurring. | |
349 | * | |
350 | * This is intended as a debugging tool for the developer only. | |
351 | * Please refrain from leaving trace_printks scattered around in | |
352 | * your code. | |
353 | */ | |
769b0441 FW |
354 | |
355 | #define trace_printk(fmt, args...) \ | |
356 | do { \ | |
769b0441 | 357 | __trace_printk_check_format(fmt, ##args); \ |
48ead020 FW |
358 | if (__builtin_constant_p(fmt)) { \ |
359 | static const char *trace_printk_fmt \ | |
360 | __attribute__((section("__trace_printk_fmt"))) = \ | |
361 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
362 | \ | |
363 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ | |
364 | } else \ | |
365 | __trace_printk(_THIS_IP_, fmt, ##args); \ | |
769b0441 FW |
366 | } while (0) |
367 | ||
48ead020 FW |
368 | extern int |
369 | __trace_bprintk(unsigned long ip, const char *fmt, ...) | |
370 | __attribute__ ((format (printf, 2, 3))); | |
371 | ||
526211bc IM |
372 | extern int |
373 | __trace_printk(unsigned long ip, const char *fmt, ...) | |
374 | __attribute__ ((format (printf, 2, 3))); | |
769b0441 | 375 | |
03889384 SR |
376 | extern void trace_dump_stack(void); |
377 | ||
48ead020 FW |
378 | /* |
379 | * The double __builtin_constant_p is because gcc will give us an error | |
380 | * if we try to allocate the static variable to fmt if it is not a | |
381 | * constant. Even with the outer if statement. | |
382 | */ | |
769b0441 FW |
383 | #define ftrace_vprintk(fmt, vargs) \ |
384 | do { \ | |
48ead020 FW |
385 | if (__builtin_constant_p(fmt)) { \ |
386 | static const char *trace_printk_fmt \ | |
387 | __attribute__((section("__trace_printk_fmt"))) = \ | |
388 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
7bffc23e | 389 | \ |
48ead020 FW |
390 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
391 | } else \ | |
392 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ | |
769b0441 FW |
393 | } while (0) |
394 | ||
48ead020 FW |
395 | extern int |
396 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); | |
397 | ||
526211bc IM |
398 | extern int |
399 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); | |
769b0441 | 400 | |
cecbca96 | 401 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
526211bc | 402 | #else |
526211bc IM |
403 | static inline int |
404 | trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); | |
405 | ||
406 | static inline void tracing_start(void) { } | |
407 | static inline void tracing_stop(void) { } | |
408 | static inline void ftrace_off_permanent(void) { } | |
e36c5458 | 409 | static inline void trace_dump_stack(void) { } |
526211bc IM |
410 | static inline int |
411 | trace_printk(const char *fmt, ...) | |
412 | { | |
413 | return 0; | |
414 | } | |
415 | static inline int | |
416 | ftrace_vprintk(const char *fmt, va_list ap) | |
417 | { | |
418 | return 0; | |
419 | } | |
cecbca96 | 420 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
769b0441 | 421 | #endif /* CONFIG_TRACING */ |
526211bc | 422 | |
1da177e4 | 423 | /* |
bdf4bbaa | 424 | * min()/max()/clamp() macros that also do |
1da177e4 LT |
425 | * strict type-checking.. See the |
426 | * "unnecessary" pointer comparison. | |
427 | */ | |
bdf4bbaa HH |
428 | #define min(x, y) ({ \ |
429 | typeof(x) _min1 = (x); \ | |
430 | typeof(y) _min2 = (y); \ | |
431 | (void) (&_min1 == &_min2); \ | |
432 | _min1 < _min2 ? _min1 : _min2; }) | |
433 | ||
434 | #define max(x, y) ({ \ | |
435 | typeof(x) _max1 = (x); \ | |
436 | typeof(y) _max2 = (y); \ | |
437 | (void) (&_max1 == &_max2); \ | |
438 | _max1 > _max2 ? _max1 : _max2; }) | |
439 | ||
f27c85c5 HPP |
440 | #define min3(x, y, z) ({ \ |
441 | typeof(x) _min1 = (x); \ | |
442 | typeof(y) _min2 = (y); \ | |
443 | typeof(z) _min3 = (z); \ | |
444 | (void) (&_min1 == &_min2); \ | |
445 | (void) (&_min1 == &_min3); \ | |
446 | _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ | |
447 | (_min2 < _min3 ? _min2 : _min3); }) | |
448 | ||
449 | #define max3(x, y, z) ({ \ | |
450 | typeof(x) _max1 = (x); \ | |
451 | typeof(y) _max2 = (y); \ | |
452 | typeof(z) _max3 = (z); \ | |
453 | (void) (&_max1 == &_max2); \ | |
454 | (void) (&_max1 == &_max3); \ | |
455 | _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ | |
456 | (_max2 > _max3 ? _max2 : _max3); }) | |
457 | ||
c8bf1336 MP |
458 | /** |
459 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero | |
460 | * @x: value1 | |
461 | * @y: value2 | |
462 | */ | |
463 | #define min_not_zero(x, y) ({ \ | |
464 | typeof(x) __x = (x); \ | |
465 | typeof(y) __y = (y); \ | |
466 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | |
467 | ||
bdf4bbaa HH |
468 | /** |
469 | * clamp - return a value clamped to a given range with strict typechecking | |
470 | * @val: current value | |
471 | * @min: minimum allowable value | |
472 | * @max: maximum allowable value | |
473 | * | |
474 | * This macro does strict typechecking of min/max to make sure they are of the | |
475 | * same type as val. See the unnecessary pointer comparisons. | |
476 | */ | |
477 | #define clamp(val, min, max) ({ \ | |
478 | typeof(val) __val = (val); \ | |
479 | typeof(min) __min = (min); \ | |
480 | typeof(max) __max = (max); \ | |
481 | (void) (&__val == &__min); \ | |
482 | (void) (&__val == &__max); \ | |
483 | __val = __val < __min ? __min: __val; \ | |
484 | __val > __max ? __max: __val; }) | |
1da177e4 LT |
485 | |
486 | /* | |
487 | * ..and if you can't take the strict | |
488 | * types, you can specify one yourself. | |
489 | * | |
bdf4bbaa HH |
490 | * Or not use min/max/clamp at all, of course. |
491 | */ | |
492 | #define min_t(type, x, y) ({ \ | |
493 | type __min1 = (x); \ | |
494 | type __min2 = (y); \ | |
495 | __min1 < __min2 ? __min1: __min2; }) | |
496 | ||
497 | #define max_t(type, x, y) ({ \ | |
498 | type __max1 = (x); \ | |
499 | type __max2 = (y); \ | |
500 | __max1 > __max2 ? __max1: __max2; }) | |
501 | ||
502 | /** | |
503 | * clamp_t - return a value clamped to a given range using a given type | |
504 | * @type: the type of variable to use | |
505 | * @val: current value | |
506 | * @min: minimum allowable value | |
507 | * @max: maximum allowable value | |
508 | * | |
509 | * This macro does no typechecking and uses temporary variables of type | |
510 | * 'type' to make all the comparisons. | |
1da177e4 | 511 | */ |
bdf4bbaa HH |
512 | #define clamp_t(type, val, min, max) ({ \ |
513 | type __val = (val); \ | |
514 | type __min = (min); \ | |
515 | type __max = (max); \ | |
516 | __val = __val < __min ? __min: __val; \ | |
517 | __val > __max ? __max: __val; }) | |
1da177e4 | 518 | |
bdf4bbaa HH |
519 | /** |
520 | * clamp_val - return a value clamped to a given range using val's type | |
521 | * @val: current value | |
522 | * @min: minimum allowable value | |
523 | * @max: maximum allowable value | |
524 | * | |
525 | * This macro does no typechecking and uses temporary variables of whatever | |
526 | * type the input argument 'val' is. This is useful when val is an unsigned | |
527 | * type and min and max are literals that will otherwise be assigned a signed | |
528 | * integer type. | |
529 | */ | |
530 | #define clamp_val(val, min, max) ({ \ | |
531 | typeof(val) __val = (val); \ | |
532 | typeof(val) __min = (min); \ | |
533 | typeof(val) __max = (max); \ | |
534 | __val = __val < __min ? __min: __val; \ | |
535 | __val > __max ? __max: __val; }) | |
1da177e4 | 536 | |
91f68b73 WF |
537 | |
538 | /* | |
539 | * swap - swap value of @a and @b | |
540 | */ | |
ac7b9004 PZ |
541 | #define swap(a, b) \ |
542 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | |
91f68b73 | 543 | |
1da177e4 LT |
544 | /** |
545 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
546 | * @ptr: the pointer to the member. |
547 | * @type: the type of the container struct this is embedded in. | |
548 | * @member: the name of the member within the struct. | |
549 | * | |
550 | */ | |
551 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
552 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
553 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 | 554 | |
d4d23add KM |
555 | struct sysinfo; |
556 | extern int do_sysinfo(struct sysinfo *info); | |
557 | ||
1da177e4 LT |
558 | #endif /* __KERNEL__ */ |
559 | ||
560 | #define SI_LOAD_SHIFT 16 | |
561 | struct sysinfo { | |
562 | long uptime; /* Seconds since boot */ | |
563 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ | |
564 | unsigned long totalram; /* Total usable main memory size */ | |
565 | unsigned long freeram; /* Available memory size */ | |
566 | unsigned long sharedram; /* Amount of shared memory */ | |
567 | unsigned long bufferram; /* Memory used by buffers */ | |
568 | unsigned long totalswap; /* Total swap space size */ | |
569 | unsigned long freeswap; /* swap space still available */ | |
570 | unsigned short procs; /* Number of current processes */ | |
571 | unsigned short pad; /* explicit padding for m68k */ | |
572 | unsigned long totalhigh; /* Total high memory size */ | |
573 | unsigned long freehigh; /* Available high memory size */ | |
574 | unsigned int mem_unit; /* Memory unit size in bytes */ | |
575 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ | |
576 | }; | |
577 | ||
cc8ef6eb RD |
578 | /* Force a compilation error if a constant expression is not a power of 2 */ |
579 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ | |
580 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) | |
581 | ||
4552d5dc JB |
582 | /* Force a compilation error if condition is true, but also produce a |
583 | result (of value 0 and type size_t), so the expression can be used | |
584 | e.g. in a structure initializer (or where-ever else comma expressions | |
585 | aren't permitted). */ | |
8c87df45 JB |
586 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
587 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) | |
4552d5dc | 588 | |
7ef88ad5 RR |
589 | /** |
590 | * BUILD_BUG_ON - break compile if a condition is true. | |
591 | * @cond: the condition which the compiler should know is false. | |
592 | * | |
593 | * If you have some code which relies on certain constants being equal, or | |
594 | * other compile-time-evaluated condition, you should use BUILD_BUG_ON to | |
595 | * detect if someone changes it. | |
596 | * | |
597 | * The implementation uses gcc's reluctance to create a negative array, but | |
598 | * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments | |
599 | * to inline functions). So as a fallback we use the optimizer; if it can't | |
600 | * prove the condition is false, it will cause a link error on the undefined | |
601 | * "__build_bug_on_failed". This error message can be harder to track down | |
602 | * though, hence the two different methods. | |
603 | */ | |
604 | #ifndef __OPTIMIZE__ | |
605 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
606 | #else | |
607 | extern int __build_bug_on_failed; | |
608 | #define BUILD_BUG_ON(condition) \ | |
609 | do { \ | |
610 | ((void)sizeof(char[1 - 2*!!(condition)])); \ | |
611 | if (condition) __build_bug_on_failed = 1; \ | |
612 | } while(0) | |
613 | #endif | |
7ef88ad5 | 614 | |
1da177e4 | 615 | /* Trap pasters of __FUNCTION__ at compile-time */ |
1da177e4 | 616 | #define __FUNCTION__ (__func__) |
1da177e4 | 617 | |
08e0f6a9 CL |
618 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
619 | #ifdef CONFIG_NUMA | |
620 | #define NUMA_BUILD 1 | |
621 | #else | |
622 | #define NUMA_BUILD 0 | |
623 | #endif | |
624 | ||
3e7d3449 MG |
625 | /* This helps us avoid #ifdef CONFIG_COMPACTION */ |
626 | #ifdef CONFIG_COMPACTION | |
627 | #define COMPACTION_BUILD 1 | |
628 | #else | |
629 | #define COMPACTION_BUILD 0 | |
630 | #endif | |
631 | ||
29e71abf SR |
632 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
633 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
634 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | |
635 | #endif | |
636 | ||
1da177e4 | 637 | #endif |