Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_KERNEL_H |
| 2 | #define _LINUX_KERNEL_H |
| 3 | |
| 4 | /* |
| 5 | * 'kernel.h' contains some often-used function prototypes etc |
| 6 | */ |
Alexey Dobriyan | a79ff73 | 2010-04-13 11:21:46 +0200 | [diff] [blame] | 7 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) |
| 8 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 18 | #include <linux/log2.h> |
Andrew Morton | e0deaff4 | 2008-07-25 01:45:24 -0700 | [diff] [blame] | 19 | #include <linux/typecheck.h> |
Linus Torvalds | 968ab18 | 2010-11-15 13:37:37 -0800 | [diff] [blame] | 20 | #include <linux/printk.h> |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 21 | #include <linux/dynamic_debug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/byteorder.h> |
| 23 | #include <asm/bug.h> |
| 24 | |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 25 | #define USHRT_MAX ((u16)(~0U)) |
| 26 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) |
| 27 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 34 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
| 35 | #define LLONG_MIN (-LLONG_MAX - 1) |
| 36 | #define ULLONG_MAX (~0ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #define STACK_MAGIC 0xdeadbeef |
| 39 | |
Alexey Dobriyan | a79ff73 | 2010-04-13 11:21:46 +0200 | [diff] [blame] | 40 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
Alexey Dobriyan | 9f93ff5 | 2010-04-13 14:09:15 +0200 | [diff] [blame] | 41 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
Matthew Wilcox | a83308e | 2007-09-11 15:23:47 -0700 | [diff] [blame] | 42 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
Herbert Xu | f10db62 | 2008-02-06 01:37:05 -0800 | [diff] [blame] | 43 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 44 | |
Rusty Russell | c5e631cf | 2007-05-06 14:51:05 -0700 | [diff] [blame] | 45 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
| 46 | |
Yinghai Lu | 9b3be9f | 2010-02-10 01:20:29 -0800 | [diff] [blame] | 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 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 57 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
Steven Whitehouse | 930631e | 2006-09-25 23:32:40 -0700 | [diff] [blame] | 58 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
James Morris | 074e61e | 2010-11-10 09:01:31 +1100 | [diff] [blame] | 59 | |
| 60 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ |
Eric Paris | b28efd5 | 2010-10-13 17:50:08 -0400 | [diff] [blame] | 61 | #define roundup(x, y) ( \ |
| 62 | { \ |
Tetsuo Handa | 6070bf3 | 2010-11-08 11:20:49 +0900 | [diff] [blame] | 63 | const typeof(y) __y = y; \ |
Eric Paris | b28efd5 | 2010-10-13 17:50:08 -0400 | [diff] [blame] | 64 | (((x) + (__y - 1)) / __y) * __y; \ |
| 65 | } \ |
| 66 | ) |
Eric Paris | 686a0f3 | 2010-10-13 17:50:02 -0400 | [diff] [blame] | 67 | #define rounddown(x, y) ( \ |
| 68 | { \ |
| 69 | typeof(x) __x = (x); \ |
| 70 | __x - (__x % (y)); \ |
| 71 | } \ |
| 72 | ) |
Darrick J. Wong | 9fe0608 | 2009-01-06 14:40:51 -0800 | [diff] [blame] | 73 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
| 74 | { \ |
| 75 | typeof(divisor) __divisor = divisor; \ |
| 76 | (((x) + ((__divisor) / 2)) / (__divisor)); \ |
| 77 | } \ |
| 78 | ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Eduard - Gabriel Munteanu | ca31e14 | 2008-07-05 12:14:23 +0300 | [diff] [blame] | 80 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
| 81 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) |
| 82 | |
Bartlomiej Zolnierkiewicz | 90c699a | 2009-06-19 08:08:50 +0200 | [diff] [blame] | 83 | #ifdef CONFIG_LBDAF |
Jens Axboe | 2da96ac | 2007-10-12 12:40:38 +0200 | [diff] [blame] | 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 | |
Andrew Morton | 218e180 | 2007-05-10 03:15:18 -0700 | [diff] [blame] | 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 | |
Joerg Roedel | 204b885 | 2008-07-29 22:33:42 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | struct completion; |
akpm@osdl.org | df2e71f | 2006-01-09 20:51:37 -0800 | [diff] [blame] | 114 | struct pt_regs; |
| 115 | struct user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Uwe Kleine-König | 070cb06 | 2008-08-12 15:08:59 -0700 | [diff] [blame] | 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 | |
Randy Dunlap | 7106a27 | 2008-10-29 14:01:15 -0700 | [diff] [blame] | 124 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
Simon Kagstrom | d894837 | 2009-12-23 11:08:18 +0100 | [diff] [blame] | 125 | void __might_sleep(const char *file, int line, int preempt_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Jim Cromie | e20ec99 | 2006-11-30 04:46:13 +0100 | [diff] [blame] | 133 | * be bitten later when the calling function happens to sleep when it is not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | * supposed to. |
| 135 | */ |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 136 | # define might_sleep() \ |
Frederic Weisbecker | e4aafea | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 137 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 138 | #else |
Simon Kagstrom | d894837 | 2009-12-23 11:08:18 +0100 | [diff] [blame] | 139 | static inline void __might_sleep(const char *file, int line, |
| 140 | int preempt_offset) { } |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 141 | # define might_sleep() do { might_resched(); } while (0) |
| 142 | #endif |
| 143 | |
Hua Zhong | 368a5fa | 2006-06-23 02:05:42 -0700 | [diff] [blame] | 144 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 145 | |
Andrew Morton | 71a9048 | 2011-01-12 16:59:35 -0800 | [diff] [blame] | 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; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | }) |
| 163 | |
Brian Behlendorf | 658716d | 2010-10-26 14:23:10 -0700 | [diff] [blame] | 164 | #define abs64(x) ({ \ |
| 165 | s64 __x = (x); \ |
| 166 | (__x < 0) ? -__x : __x; \ |
| 167 | }) |
| 168 | |
Nick Piggin | 3ee1afa | 2008-09-10 13:37:17 +0200 | [diff] [blame] | 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 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 178 | extern struct atomic_notifier_head panic_notifier_list; |
TAMUKI Shoichi | c7ff0d9 | 2010-08-10 18:03:28 -0700 | [diff] [blame] | 179 | extern long (*panic_blink)(int state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | NORET_TYPE void panic(const char * fmt, ...) |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 181 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 182 | extern void oops_enter(void); |
| 183 | extern void oops_exit(void); |
Anton Blanchard | 863a604 | 2010-08-10 18:03:30 -0700 | [diff] [blame] | 184 | void print_oops_end_marker(void); |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 185 | extern int oops_may_print(void); |
Harvey Harrison | ec70158 | 2008-02-08 04:19:55 -0800 | [diff] [blame] | 186 | NORET_TYPE void do_exit(long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | ATTRIB_NORET; |
| 188 | NORET_TYPE void complete_and_exit(struct completion *, long) |
| 189 | ATTRIB_NORET; |
Alexey Dobriyan | 33ee3b2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 190 | |
| 191 | /* Internal, do not use. */ |
| 192 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); |
| 193 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); |
| 194 | |
| 195 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); |
| 196 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); |
| 197 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) |
| 198 | { |
| 199 | /* |
| 200 | * We want to shortcut function call, but |
| 201 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. |
| 202 | */ |
| 203 | if (sizeof(unsigned long) == sizeof(unsigned long long) && |
| 204 | __alignof__(unsigned long) == __alignof__(unsigned long long)) |
| 205 | return kstrtoull(s, base, (unsigned long long *)res); |
| 206 | else |
| 207 | return _kstrtoul(s, base, res); |
| 208 | } |
| 209 | |
| 210 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) |
| 211 | { |
| 212 | /* |
| 213 | * We want to shortcut function call, but |
| 214 | * __builtin_types_compatible_p(long, long long) = 0. |
| 215 | */ |
| 216 | if (sizeof(long) == sizeof(long long) && |
| 217 | __alignof__(long) == __alignof__(long long)) |
| 218 | return kstrtoll(s, base, (long long *)res); |
| 219 | else |
| 220 | return _kstrtol(s, base, res); |
| 221 | } |
| 222 | |
| 223 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); |
| 224 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); |
| 225 | |
| 226 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) |
| 227 | { |
| 228 | return kstrtoull(s, base, res); |
| 229 | } |
| 230 | |
| 231 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) |
| 232 | { |
| 233 | return kstrtoll(s, base, res); |
| 234 | } |
| 235 | |
| 236 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) |
| 237 | { |
| 238 | return kstrtouint(s, base, res); |
| 239 | } |
| 240 | |
| 241 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) |
| 242 | { |
| 243 | return kstrtoint(s, base, res); |
| 244 | } |
| 245 | |
| 246 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); |
| 247 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); |
| 248 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); |
| 249 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); |
| 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
| 252 | extern long simple_strtol(const char *,char **,unsigned int); |
| 253 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
| 254 | extern long long simple_strtoll(const char *,char **,unsigned int); |
Alexey Dobriyan | 33ee3b2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 255 | #define strict_strtoul kstrtoul |
| 256 | #define strict_strtol kstrtol |
| 257 | #define strict_strtoull kstrtoull |
| 258 | #define strict_strtoll kstrtoll |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | extern int sprintf(char * buf, const char * fmt, ...) |
| 261 | __attribute__ ((format (printf, 2, 3))); |
| 262 | extern int vsprintf(char *buf, const char *, va_list) |
| 263 | __attribute__ ((format (printf, 2, 0))); |
| 264 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
| 265 | __attribute__ ((format (printf, 3, 4))); |
| 266 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 267 | __attribute__ ((format (printf, 3, 0))); |
| 268 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
| 269 | __attribute__ ((format (printf, 3, 4))); |
| 270 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 271 | __attribute__ ((format (printf, 3, 0))); |
Jeremy Fitzhardinge | e905914 | 2006-06-25 05:49:17 -0700 | [diff] [blame] | 272 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
| 273 | __attribute__ ((format (printf, 2, 3))); |
Jeremy Fitzhardinge | 11443ec | 2007-04-30 15:09:56 -0700 | [diff] [blame] | 274 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | extern int sscanf(const char *, const char *, ...) |
| 277 | __attribute__ ((format (scanf, 2, 3))); |
| 278 | extern int vsscanf(const char *, const char *, va_list) |
| 279 | __attribute__ ((format (scanf, 2, 0))); |
| 280 | |
| 281 | extern int get_option(char **str, int *pint); |
| 282 | extern char *get_options(const char *str, int nints, int *ints); |
Jeremy Fitzhardinge | d974ae3 | 2008-07-24 16:27:46 -0700 | [diff] [blame] | 283 | extern unsigned long long memparse(const char *ptr, char **retptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 285 | extern int core_kernel_text(unsigned long addr); |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame^] | 286 | extern int core_kernel_data(unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | extern int __kernel_text_address(unsigned long addr); |
| 288 | extern int kernel_text_address(unsigned long addr); |
Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 289 | extern int func_ptr_is_kernel_text(void *ptr); |
Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 290 | |
Eric W. Biederman | 04a2e6a | 2007-02-12 00:52:56 -0800 | [diff] [blame] | 291 | struct pid; |
| 292 | extern struct pid *session_of_pgrp(struct pid *pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | unsigned long int_sqrt(unsigned long); |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | extern void bust_spinlocks(int yes); |
Kirill Korotaev | e3e8a75 | 2007-02-10 01:46:19 -0800 | [diff] [blame] | 297 | extern void wake_up_klogd(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
Adrian Bunk | aa72710 | 2006-04-10 22:53:59 -0700 | [diff] [blame] | 299 | extern int panic_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | extern int panic_on_oops; |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 301 | extern int panic_on_unrecovered_nmi; |
Kurt Garloff | 5211a24 | 2009-06-24 14:32:11 -0700 | [diff] [blame] | 302 | extern int panic_on_io_nmi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | extern const char *print_tainted(void); |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 304 | extern void add_taint(unsigned flag); |
| 305 | extern int test_taint(unsigned flag); |
| 306 | extern unsigned long get_taint(void); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 307 | extern int root_mountflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 309 | extern bool early_boot_irqs_disabled; |
| 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | /* Values used for system_state */ |
| 312 | extern enum system_states { |
| 313 | SYSTEM_BOOTING, |
| 314 | SYSTEM_RUNNING, |
| 315 | SYSTEM_HALT, |
| 316 | SYSTEM_POWER_OFF, |
| 317 | SYSTEM_RESTART, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 318 | SYSTEM_SUSPEND_DISK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } system_state; |
| 320 | |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 321 | #define TAINT_PROPRIETARY_MODULE 0 |
| 322 | #define TAINT_FORCED_MODULE 1 |
| 323 | #define TAINT_UNSAFE_SMP 2 |
| 324 | #define TAINT_FORCED_RMMOD 3 |
| 325 | #define TAINT_MACHINE_CHECK 4 |
| 326 | #define TAINT_BAD_PAGE 5 |
| 327 | #define TAINT_USER 6 |
| 328 | #define TAINT_DIE 7 |
| 329 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 |
| 330 | #define TAINT_WARN 9 |
Linus Torvalds | 26e9a39 | 2008-10-17 09:50:12 -0700 | [diff] [blame] | 331 | #define TAINT_CRAP 10 |
Ben Hutchings | 92946bc | 2010-04-03 19:36:42 +0100 | [diff] [blame] | 332 | #define TAINT_FIRMWARE_WORKAROUND 11 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Harvey Harrison | 3fc9577 | 2008-05-14 16:05:49 -0700 | [diff] [blame] | 334 | extern const char hex_asc[]; |
| 335 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] |
| 336 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |
| 337 | |
| 338 | static inline char *pack_hex_byte(char *buf, u8 byte) |
| 339 | { |
| 340 | *buf++ = hex_asc_hi(byte); |
| 341 | *buf++ = hex_asc_lo(byte); |
| 342 | return buf; |
| 343 | } |
Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 344 | |
Andy Shevchenko | 90378889 | 2010-05-24 14:33:23 -0700 | [diff] [blame] | 345 | extern int hex_to_bin(char ch); |
Mimi Zohar | dc88e46 | 2010-11-23 17:50:31 -0500 | [diff] [blame] | 346 | extern void hex2bin(u8 *dst, const char *src, size_t count); |
Andy Shevchenko | 90378889 | 2010-05-24 14:33:23 -0700 | [diff] [blame] | 347 | |
Joe Perches | 8a64f33 | 2009-12-14 18:00:25 -0800 | [diff] [blame] | 348 | /* |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 349 | * General tracing related utility functions - trace_printk(), |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 350 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
| 351 | * |
| 352 | * Use tracing_on/tracing_off when you want to quickly turn on or off |
| 353 | * tracing. It simply enables or disables the recording of the trace events. |
GeunSik Lim | 156f5a7 | 2009-06-02 15:01:37 +0900 | [diff] [blame] | 354 | * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 355 | * file, which gives a means for the kernel and userspace to interact. |
| 356 | * Place a tracing_off() in the kernel where you want tracing to end. |
| 357 | * From user space, examine the trace, and then echo 1 > tracing_on |
| 358 | * to continue tracing. |
| 359 | * |
| 360 | * tracing_stop/tracing_start has slightly more overhead. It is used |
| 361 | * by things like suspend to ram where disabling the recording of the |
| 362 | * trace is not enough, but tracing must actually stop because things |
| 363 | * like calling smp_processor_id() may crash the system. |
| 364 | * |
| 365 | * Most likely, you want to use tracing_on/tracing_off. |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 366 | */ |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 367 | #ifdef CONFIG_RING_BUFFER |
| 368 | void tracing_on(void); |
| 369 | void tracing_off(void); |
| 370 | /* trace_off_permanent stops recording with no way to bring it back */ |
| 371 | void tracing_off_permanent(void); |
| 372 | int tracing_is_on(void); |
| 373 | #else |
| 374 | static inline void tracing_on(void) { } |
| 375 | static inline void tracing_off(void) { } |
| 376 | static inline void tracing_off_permanent(void) { } |
| 377 | static inline int tracing_is_on(void) { return 0; } |
| 378 | #endif |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 379 | |
| 380 | enum ftrace_dump_mode { |
| 381 | DUMP_NONE, |
| 382 | DUMP_ALL, |
| 383 | DUMP_ORIG, |
| 384 | }; |
| 385 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 386 | #ifdef CONFIG_TRACING |
| 387 | extern void tracing_start(void); |
| 388 | extern void tracing_stop(void); |
| 389 | extern void ftrace_off_permanent(void); |
| 390 | |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 391 | static inline void __attribute__ ((format (printf, 1, 2))) |
| 392 | ____trace_printk_check_format(const char *fmt, ...) |
| 393 | { |
| 394 | } |
| 395 | #define __trace_printk_check_format(fmt, args...) \ |
| 396 | do { \ |
| 397 | if (0) \ |
| 398 | ____trace_printk_check_format(fmt, ##args); \ |
| 399 | } while (0) |
| 400 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 401 | /** |
| 402 | * trace_printk - printf formatting in the ftrace buffer |
| 403 | * @fmt: the printf format for printing |
| 404 | * |
| 405 | * Note: __trace_printk is an internal function for trace_printk and |
| 406 | * the @ip is passed in via the trace_printk macro. |
| 407 | * |
| 408 | * This function allows a kernel developer to debug fast path sections |
| 409 | * that printk is not appropriate for. By scattering in various |
| 410 | * printk like tracing in the code, a developer can quickly see |
| 411 | * where problems are occurring. |
| 412 | * |
| 413 | * This is intended as a debugging tool for the developer only. |
| 414 | * Please refrain from leaving trace_printks scattered around in |
| 415 | * your code. |
| 416 | */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 417 | |
| 418 | #define trace_printk(fmt, args...) \ |
| 419 | do { \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 420 | __trace_printk_check_format(fmt, ##args); \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 421 | if (__builtin_constant_p(fmt)) { \ |
| 422 | static const char *trace_printk_fmt \ |
| 423 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 424 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
| 425 | \ |
| 426 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
| 427 | } else \ |
| 428 | __trace_printk(_THIS_IP_, fmt, ##args); \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 429 | } while (0) |
| 430 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 431 | extern int |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 432 | __trace_bprintk(unsigned long ip, const char *fmt, ...) |
| 433 | __attribute__ ((format (printf, 2, 3))); |
| 434 | |
| 435 | extern int |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 436 | __trace_printk(unsigned long ip, const char *fmt, ...) |
| 437 | __attribute__ ((format (printf, 2, 3))); |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 438 | |
Steven Rostedt | 0388938 | 2009-12-11 09:48:22 -0500 | [diff] [blame] | 439 | extern void trace_dump_stack(void); |
| 440 | |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 441 | /* |
| 442 | * The double __builtin_constant_p is because gcc will give us an error |
| 443 | * if we try to allocate the static variable to fmt if it is not a |
| 444 | * constant. Even with the outer if statement. |
| 445 | */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 446 | #define ftrace_vprintk(fmt, vargs) \ |
| 447 | do { \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 448 | if (__builtin_constant_p(fmt)) { \ |
| 449 | static const char *trace_printk_fmt \ |
| 450 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 451 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
Ingo Molnar | 7bffc23 | 2009-03-09 10:11:36 +0100 | [diff] [blame] | 452 | \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 453 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
| 454 | } else \ |
| 455 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 456 | } while (0) |
| 457 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 458 | extern int |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 459 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
| 460 | |
| 461 | extern int |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 462 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 463 | |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 464 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 465 | #else |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 466 | static inline int |
| 467 | trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); |
| 468 | |
| 469 | static inline void tracing_start(void) { } |
| 470 | static inline void tracing_stop(void) { } |
| 471 | static inline void ftrace_off_permanent(void) { } |
Steven Rostedt | e36c545 | 2009-12-14 15:58:33 -0500 | [diff] [blame] | 472 | static inline void trace_dump_stack(void) { } |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 473 | static inline int |
| 474 | trace_printk(const char *fmt, ...) |
| 475 | { |
| 476 | return 0; |
| 477 | } |
| 478 | static inline int |
| 479 | ftrace_vprintk(const char *fmt, va_list ap) |
| 480 | { |
| 481 | return 0; |
| 482 | } |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 483 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 484 | #endif /* CONFIG_TRACING */ |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 485 | |
| 486 | /* |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 487 | * min()/max()/clamp() macros that also do |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | * strict type-checking.. See the |
| 489 | * "unnecessary" pointer comparison. |
| 490 | */ |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 491 | #define min(x, y) ({ \ |
| 492 | typeof(x) _min1 = (x); \ |
| 493 | typeof(y) _min2 = (y); \ |
| 494 | (void) (&_min1 == &_min2); \ |
| 495 | _min1 < _min2 ? _min1 : _min2; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 497 | #define max(x, y) ({ \ |
| 498 | typeof(x) _max1 = (x); \ |
| 499 | typeof(y) _max2 = (y); \ |
| 500 | (void) (&_max1 == &_max2); \ |
| 501 | _max1 > _max2 ? _max1 : _max2; }) |
| 502 | |
Hagen Paul Pfeifer | f27c85c | 2010-10-26 14:22:21 -0700 | [diff] [blame] | 503 | #define min3(x, y, z) ({ \ |
| 504 | typeof(x) _min1 = (x); \ |
| 505 | typeof(y) _min2 = (y); \ |
| 506 | typeof(z) _min3 = (z); \ |
| 507 | (void) (&_min1 == &_min2); \ |
| 508 | (void) (&_min1 == &_min3); \ |
| 509 | _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ |
| 510 | (_min2 < _min3 ? _min2 : _min3); }) |
| 511 | |
| 512 | #define max3(x, y, z) ({ \ |
| 513 | typeof(x) _max1 = (x); \ |
| 514 | typeof(y) _max2 = (y); \ |
| 515 | typeof(z) _max3 = (z); \ |
| 516 | (void) (&_max1 == &_max2); \ |
| 517 | (void) (&_max1 == &_max3); \ |
| 518 | _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ |
| 519 | (_max2 > _max3 ? _max2 : _max3); }) |
| 520 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 521 | /** |
Martin K. Petersen | c8bf133 | 2010-09-10 20:07:38 +0200 | [diff] [blame] | 522 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero |
| 523 | * @x: value1 |
| 524 | * @y: value2 |
| 525 | */ |
| 526 | #define min_not_zero(x, y) ({ \ |
| 527 | typeof(x) __x = (x); \ |
| 528 | typeof(y) __y = (y); \ |
| 529 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) |
| 530 | |
| 531 | /** |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 532 | * clamp - return a value clamped to a given range with strict typechecking |
| 533 | * @val: current value |
| 534 | * @min: minimum allowable value |
| 535 | * @max: maximum allowable value |
| 536 | * |
| 537 | * This macro does strict typechecking of min/max to make sure they are of the |
| 538 | * same type as val. See the unnecessary pointer comparisons. |
| 539 | */ |
| 540 | #define clamp(val, min, max) ({ \ |
| 541 | typeof(val) __val = (val); \ |
| 542 | typeof(min) __min = (min); \ |
| 543 | typeof(max) __max = (max); \ |
| 544 | (void) (&__val == &__min); \ |
| 545 | (void) (&__val == &__max); \ |
| 546 | __val = __val < __min ? __min: __val; \ |
| 547 | __val > __max ? __max: __val; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | /* |
| 550 | * ..and if you can't take the strict |
| 551 | * types, you can specify one yourself. |
| 552 | * |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 553 | * Or not use min/max/clamp at all, of course. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | */ |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 555 | #define min_t(type, x, y) ({ \ |
| 556 | type __min1 = (x); \ |
| 557 | type __min2 = (y); \ |
| 558 | __min1 < __min2 ? __min1: __min2; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 560 | #define max_t(type, x, y) ({ \ |
| 561 | type __max1 = (x); \ |
| 562 | type __max2 = (y); \ |
| 563 | __max1 > __max2 ? __max1: __max2; }) |
| 564 | |
| 565 | /** |
| 566 | * clamp_t - return a value clamped to a given range using a given type |
| 567 | * @type: the type of variable to use |
| 568 | * @val: current value |
| 569 | * @min: minimum allowable value |
| 570 | * @max: maximum allowable value |
| 571 | * |
| 572 | * This macro does no typechecking and uses temporary variables of type |
| 573 | * 'type' to make all the comparisons. |
| 574 | */ |
| 575 | #define clamp_t(type, val, min, max) ({ \ |
| 576 | type __val = (val); \ |
| 577 | type __min = (min); \ |
| 578 | type __max = (max); \ |
| 579 | __val = __val < __min ? __min: __val; \ |
| 580 | __val > __max ? __max: __val; }) |
| 581 | |
| 582 | /** |
| 583 | * clamp_val - return a value clamped to a given range using val's type |
| 584 | * @val: current value |
| 585 | * @min: minimum allowable value |
| 586 | * @max: maximum allowable value |
| 587 | * |
| 588 | * This macro does no typechecking and uses temporary variables of whatever |
| 589 | * type the input argument 'val' is. This is useful when val is an unsigned |
| 590 | * type and min and max are literals that will otherwise be assigned a signed |
| 591 | * integer type. |
| 592 | */ |
| 593 | #define clamp_val(val, min, max) ({ \ |
| 594 | typeof(val) __val = (val); \ |
| 595 | typeof(val) __min = (min); \ |
| 596 | typeof(val) __max = (max); \ |
| 597 | __val = __val < __min ? __min: __val; \ |
| 598 | __val > __max ? __max: __val; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 600 | |
| 601 | /* |
| 602 | * swap - swap value of @a and @b |
| 603 | */ |
Peter Zijlstra | ac7b900 | 2009-02-04 15:11:59 -0800 | [diff] [blame] | 604 | #define swap(a, b) \ |
| 605 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) |
Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | /** |
| 608 | * container_of - cast a member of a structure out to the containing structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | * @ptr: the pointer to the member. |
| 610 | * @type: the type of the container struct this is embedded in. |
| 611 | * @member: the name of the member within the struct. |
| 612 | * |
| 613 | */ |
| 614 | #define container_of(ptr, type, member) ({ \ |
Daniel Walker | 78db2ad | 2007-05-12 16:28:35 -0700 | [diff] [blame] | 615 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 616 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
Kyle McMartin | d4d23ad | 2007-02-10 01:46:00 -0800 | [diff] [blame] | 618 | struct sysinfo; |
| 619 | extern int do_sysinfo(struct sysinfo *info); |
| 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | #endif /* __KERNEL__ */ |
| 622 | |
| 623 | #define SI_LOAD_SHIFT 16 |
| 624 | struct sysinfo { |
| 625 | long uptime; /* Seconds since boot */ |
| 626 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
| 627 | unsigned long totalram; /* Total usable main memory size */ |
| 628 | unsigned long freeram; /* Available memory size */ |
| 629 | unsigned long sharedram; /* Amount of shared memory */ |
| 630 | unsigned long bufferram; /* Memory used by buffers */ |
| 631 | unsigned long totalswap; /* Total swap space size */ |
| 632 | unsigned long freeswap; /* swap space still available */ |
| 633 | unsigned short procs; /* Number of current processes */ |
| 634 | unsigned short pad; /* explicit padding for m68k */ |
| 635 | unsigned long totalhigh; /* Total high memory size */ |
| 636 | unsigned long freehigh; /* Available high memory size */ |
| 637 | unsigned int mem_unit; /* Memory unit size in bytes */ |
| 638 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
| 639 | }; |
| 640 | |
Roland Dreier | cc8ef6e | 2010-01-15 17:01:22 -0800 | [diff] [blame] | 641 | /* Force a compilation error if a constant expression is not a power of 2 */ |
| 642 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
| 643 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
| 644 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 645 | /* Force a compilation error if condition is true, but also produce a |
| 646 | result (of value 0 and type size_t), so the expression can be used |
| 647 | e.g. in a structure initializer (or where-ever else comma expressions |
| 648 | aren't permitted). */ |
Jan Beulich | 8c87df4 | 2009-09-22 16:43:52 -0700 | [diff] [blame] | 649 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
| 650 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 651 | |
Rusty Russell | 7ef88ad | 2011-01-24 14:45:10 -0600 | [diff] [blame] | 652 | /** |
| 653 | * BUILD_BUG_ON - break compile if a condition is true. |
Randy Dunlap | ffbbf2d | 2011-01-31 09:29:14 -0800 | [diff] [blame] | 654 | * @condition: the condition which the compiler should know is false. |
Rusty Russell | 7ef88ad | 2011-01-24 14:45:10 -0600 | [diff] [blame] | 655 | * |
| 656 | * If you have some code which relies on certain constants being equal, or |
| 657 | * other compile-time-evaluated condition, you should use BUILD_BUG_ON to |
| 658 | * detect if someone changes it. |
| 659 | * |
| 660 | * The implementation uses gcc's reluctance to create a negative array, but |
| 661 | * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments |
| 662 | * to inline functions). So as a fallback we use the optimizer; if it can't |
| 663 | * prove the condition is false, it will cause a link error on the undefined |
| 664 | * "__build_bug_on_failed". This error message can be harder to track down |
| 665 | * though, hence the two different methods. |
| 666 | */ |
| 667 | #ifndef __OPTIMIZE__ |
| 668 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
| 669 | #else |
| 670 | extern int __build_bug_on_failed; |
| 671 | #define BUILD_BUG_ON(condition) \ |
| 672 | do { \ |
| 673 | ((void)sizeof(char[1 - 2*!!(condition)])); \ |
| 674 | if (condition) __build_bug_on_failed = 1; \ |
| 675 | } while(0) |
| 676 | #endif |
Rusty Russell | 7ef88ad | 2011-01-24 14:45:10 -0600 | [diff] [blame] | 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | /* Trap pasters of __FUNCTION__ at compile-time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | #define __FUNCTION__ (__func__) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Christoph Lameter | 08e0f6a | 2006-09-27 01:50:06 -0700 | [diff] [blame] | 681 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
| 682 | #ifdef CONFIG_NUMA |
| 683 | #define NUMA_BUILD 1 |
| 684 | #else |
| 685 | #define NUMA_BUILD 0 |
| 686 | #endif |
| 687 | |
Mel Gorman | 3e7d344 | 2011-01-13 15:45:56 -0800 | [diff] [blame] | 688 | /* This helps us avoid #ifdef CONFIG_COMPACTION */ |
| 689 | #ifdef CONFIG_COMPACTION |
| 690 | #define COMPACTION_BUILD 1 |
| 691 | #else |
| 692 | #define COMPACTION_BUILD 0 |
| 693 | #endif |
| 694 | |
Steven Rostedt | 29e71ab | 2008-08-14 15:45:10 -0400 | [diff] [blame] | 695 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
| 696 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 697 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
| 698 | #endif |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | #endif |