Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_KERNEL_H |
| 2 | #define _LINUX_KERNEL_H |
| 3 | |
H. Peter Anvin | d8e5dde | 2012-02-06 16:36:48 -0800 | [diff] [blame^] | 4 | #include <linux/sysinfo.h> |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | /* |
| 7 | * 'kernel.h' contains some often-used function prototypes etc |
| 8 | */ |
Alexey Dobriyan | a79ff73 | 2010-04-13 11:21:46 +0200 | [diff] [blame] | 9 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) |
| 10 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
| 12 | #ifdef __KERNEL__ |
| 13 | |
| 14 | #include <stdarg.h> |
| 15 | #include <linux/linkage.h> |
| 16 | #include <linux/stddef.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/compiler.h> |
| 19 | #include <linux/bitops.h> |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 20 | #include <linux/log2.h> |
Andrew Morton | e0deaff4 | 2008-07-25 01:45:24 -0700 | [diff] [blame] | 21 | #include <linux/typecheck.h> |
Linus Torvalds | 968ab18 | 2010-11-15 13:37:37 -0800 | [diff] [blame] | 22 | #include <linux/printk.h> |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 23 | #include <linux/dynamic_debug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/byteorder.h> |
| 25 | #include <asm/bug.h> |
| 26 | |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 27 | #define USHRT_MAX ((u16)(~0U)) |
| 28 | #define SHRT_MAX ((s16)(USHRT_MAX>>1)) |
| 29 | #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #define INT_MAX ((int)(~0U>>1)) |
| 31 | #define INT_MIN (-INT_MAX - 1) |
| 32 | #define UINT_MAX (~0U) |
| 33 | #define LONG_MAX ((long)(~0UL>>1)) |
| 34 | #define LONG_MIN (-LONG_MAX - 1) |
| 35 | #define ULONG_MAX (~0UL) |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 36 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
| 37 | #define LLONG_MIN (-LLONG_MAX - 1) |
| 38 | #define ULLONG_MAX (~0ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #define STACK_MAGIC 0xdeadbeef |
| 41 | |
Alexey Dobriyan | a79ff73 | 2010-04-13 11:21:46 +0200 | [diff] [blame] | 42 | #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) |
Alexey Dobriyan | 9f93ff5 | 2010-04-13 14:09:15 +0200 | [diff] [blame] | 43 | #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) |
Matthew Wilcox | a83308e | 2007-09-11 15:23:47 -0700 | [diff] [blame] | 44 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
Herbert Xu | f10db62 | 2008-02-06 01:37:05 -0800 | [diff] [blame] | 45 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 46 | |
Rusty Russell | c5e631cf | 2007-05-06 14:51:05 -0700 | [diff] [blame] | 47 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
| 48 | |
Yinghai Lu | 9b3be9f | 2010-02-10 01:20:29 -0800 | [diff] [blame] | 49 | /* |
| 50 | * This looks more complex than it should be. But we need to |
| 51 | * get the type for the ~ right in round_down (it needs to be |
| 52 | * as wide as the result!), and we want to evaluate the macro |
| 53 | * arguments just once each. |
| 54 | */ |
| 55 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) |
| 56 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) |
| 57 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) |
| 58 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 59 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
Steven Whitehouse | 930631e | 2006-09-25 23:32:40 -0700 | [diff] [blame] | 60 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
Nicholas Bellinger | 36a26c6 | 2011-07-26 00:35:26 -0700 | [diff] [blame] | 61 | #define DIV_ROUND_UP_ULL(ll,d) \ |
| 62 | ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) |
| 63 | |
| 64 | #if BITS_PER_LONG == 32 |
| 65 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) |
| 66 | #else |
| 67 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) |
| 68 | #endif |
James Morris | 074e61e | 2010-11-10 09:01:31 +1100 | [diff] [blame] | 69 | |
| 70 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ |
Eric Paris | b28efd5 | 2010-10-13 17:50:08 -0400 | [diff] [blame] | 71 | #define roundup(x, y) ( \ |
| 72 | { \ |
Tetsuo Handa | 6070bf3 | 2010-11-08 11:20:49 +0900 | [diff] [blame] | 73 | const typeof(y) __y = y; \ |
Eric Paris | b28efd5 | 2010-10-13 17:50:08 -0400 | [diff] [blame] | 74 | (((x) + (__y - 1)) / __y) * __y; \ |
| 75 | } \ |
| 76 | ) |
Eric Paris | 686a0f3 | 2010-10-13 17:50:02 -0400 | [diff] [blame] | 77 | #define rounddown(x, y) ( \ |
| 78 | { \ |
| 79 | typeof(x) __x = (x); \ |
| 80 | __x - (__x % (y)); \ |
| 81 | } \ |
| 82 | ) |
Darrick J. Wong | 9fe0608 | 2009-01-06 14:40:51 -0800 | [diff] [blame] | 83 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
| 84 | { \ |
| 85 | typeof(divisor) __divisor = divisor; \ |
| 86 | (((x) + ((__divisor) / 2)) / (__divisor)); \ |
| 87 | } \ |
| 88 | ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Eduard - Gabriel Munteanu | ca31e14 | 2008-07-05 12:14:23 +0300 | [diff] [blame] | 90 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
| 91 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) |
| 92 | |
Bartlomiej Zolnierkiewicz | 90c699a | 2009-06-19 08:08:50 +0200 | [diff] [blame] | 93 | #ifdef CONFIG_LBDAF |
Jens Axboe | 2da96ac | 2007-10-12 12:40:38 +0200 | [diff] [blame] | 94 | # include <asm/div64.h> |
| 95 | # define sector_div(a, b) do_div(a, b) |
| 96 | #else |
| 97 | # define sector_div(n, b)( \ |
| 98 | { \ |
| 99 | int _res; \ |
| 100 | _res = (n) % (b); \ |
| 101 | (n) /= (b); \ |
| 102 | _res; \ |
| 103 | } \ |
| 104 | ) |
| 105 | #endif |
| 106 | |
Andrew Morton | 218e180 | 2007-05-10 03:15:18 -0700 | [diff] [blame] | 107 | /** |
| 108 | * upper_32_bits - return bits 32-63 of a number |
| 109 | * @n: the number we're accessing |
| 110 | * |
| 111 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
| 112 | * the "right shift count >= width of type" warning when that quantity is |
| 113 | * 32-bits. |
| 114 | */ |
| 115 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
| 116 | |
Joerg Roedel | 204b885 | 2008-07-29 22:33:42 -0700 | [diff] [blame] | 117 | /** |
| 118 | * lower_32_bits - return bits 0-31 of a number |
| 119 | * @n: the number we're accessing |
| 120 | */ |
| 121 | #define lower_32_bits(n) ((u32)(n)) |
| 122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | struct completion; |
akpm@osdl.org | df2e71f | 2006-01-09 20:51:37 -0800 | [diff] [blame] | 124 | struct pt_regs; |
| 125 | struct user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Uwe Kleine-König | 070cb06 | 2008-08-12 15:08:59 -0700 | [diff] [blame] | 127 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
| 128 | extern int _cond_resched(void); |
| 129 | # define might_resched() _cond_resched() |
| 130 | #else |
| 131 | # define might_resched() do { } while (0) |
| 132 | #endif |
| 133 | |
Frederic Weisbecker | d902db1 | 2011-06-08 19:31:56 +0200 | [diff] [blame] | 134 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
Simon Kagstrom | d894837 | 2009-12-23 11:08:18 +0100 | [diff] [blame] | 135 | void __might_sleep(const char *file, int line, int preempt_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /** |
| 137 | * might_sleep - annotation for functions that can sleep |
| 138 | * |
| 139 | * this macro will print a stack trace if it is executed in an atomic |
| 140 | * context (spinlock, irq-handler, ...). |
| 141 | * |
| 142 | * 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] | 143 | * 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] | 144 | * supposed to. |
| 145 | */ |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 146 | # define might_sleep() \ |
Frederic Weisbecker | e4aafea | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 147 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 148 | #else |
Simon Kagstrom | d894837 | 2009-12-23 11:08:18 +0100 | [diff] [blame] | 149 | static inline void __might_sleep(const char *file, int line, |
| 150 | int preempt_offset) { } |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 151 | # define might_sleep() do { might_resched(); } while (0) |
| 152 | #endif |
| 153 | |
Hua Zhong | 368a5fa | 2006-06-23 02:05:42 -0700 | [diff] [blame] | 154 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 155 | |
Andrew Morton | 71a9048 | 2011-01-12 16:59:35 -0800 | [diff] [blame] | 156 | /* |
| 157 | * abs() handles unsigned and signed longs, ints, shorts and chars. For all |
| 158 | * input types abs() returns a signed long. |
| 159 | * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() |
| 160 | * for those. |
| 161 | */ |
| 162 | #define abs(x) ({ \ |
| 163 | long ret; \ |
| 164 | if (sizeof(x) == sizeof(long)) { \ |
| 165 | long __x = (x); \ |
| 166 | ret = (__x < 0) ? -__x : __x; \ |
| 167 | } else { \ |
| 168 | int __x = (x); \ |
| 169 | ret = (__x < 0) ? -__x : __x; \ |
| 170 | } \ |
| 171 | ret; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | }) |
| 173 | |
Brian Behlendorf | 658716d | 2010-10-26 14:23:10 -0700 | [diff] [blame] | 174 | #define abs64(x) ({ \ |
| 175 | s64 __x = (x); \ |
| 176 | (__x < 0) ? -__x : __x; \ |
| 177 | }) |
| 178 | |
Nick Piggin | 3ee1afa | 2008-09-10 13:37:17 +0200 | [diff] [blame] | 179 | #ifdef CONFIG_PROVE_LOCKING |
| 180 | void might_fault(void); |
| 181 | #else |
| 182 | static inline void might_fault(void) |
| 183 | { |
| 184 | might_sleep(); |
| 185 | } |
| 186 | #endif |
| 187 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 188 | extern struct atomic_notifier_head panic_notifier_list; |
TAMUKI Shoichi | c7ff0d9 | 2010-08-10 18:03:28 -0700 | [diff] [blame] | 189 | extern long (*panic_blink)(int state); |
Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 190 | __printf(1, 2) |
Joe Perches | 4da4785 | 2012-01-12 17:17:13 -0800 | [diff] [blame] | 191 | void panic(const char *fmt, ...) |
Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 192 | __noreturn __cold; |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 193 | extern void oops_enter(void); |
| 194 | extern void oops_exit(void); |
Anton Blanchard | 863a604 | 2010-08-10 18:03:30 -0700 | [diff] [blame] | 195 | void print_oops_end_marker(void); |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 196 | extern int oops_may_print(void); |
Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 197 | void do_exit(long error_code) |
Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 198 | __noreturn; |
Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 199 | void complete_and_exit(struct completion *, long) |
Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 200 | __noreturn; |
Alexey Dobriyan | 33ee3b2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 201 | |
| 202 | /* Internal, do not use. */ |
| 203 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); |
| 204 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); |
| 205 | |
| 206 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); |
| 207 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); |
| 208 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) |
| 209 | { |
| 210 | /* |
| 211 | * We want to shortcut function call, but |
| 212 | * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. |
| 213 | */ |
| 214 | if (sizeof(unsigned long) == sizeof(unsigned long long) && |
| 215 | __alignof__(unsigned long) == __alignof__(unsigned long long)) |
| 216 | return kstrtoull(s, base, (unsigned long long *)res); |
| 217 | else |
| 218 | return _kstrtoul(s, base, res); |
| 219 | } |
| 220 | |
| 221 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) |
| 222 | { |
| 223 | /* |
| 224 | * We want to shortcut function call, but |
| 225 | * __builtin_types_compatible_p(long, long long) = 0. |
| 226 | */ |
| 227 | if (sizeof(long) == sizeof(long long) && |
| 228 | __alignof__(long) == __alignof__(long long)) |
| 229 | return kstrtoll(s, base, (long long *)res); |
| 230 | else |
| 231 | return _kstrtol(s, base, res); |
| 232 | } |
| 233 | |
| 234 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); |
| 235 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); |
| 236 | |
| 237 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) |
| 238 | { |
| 239 | return kstrtoull(s, base, res); |
| 240 | } |
| 241 | |
| 242 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) |
| 243 | { |
| 244 | return kstrtoll(s, base, res); |
| 245 | } |
| 246 | |
| 247 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) |
| 248 | { |
| 249 | return kstrtouint(s, base, res); |
| 250 | } |
| 251 | |
| 252 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) |
| 253 | { |
| 254 | return kstrtoint(s, base, res); |
| 255 | } |
| 256 | |
| 257 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); |
| 258 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); |
| 259 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); |
| 260 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); |
| 261 | |
Alexey Dobriyan | c196e32 | 2011-05-24 17:13:31 -0700 | [diff] [blame] | 262 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); |
| 263 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); |
| 264 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); |
| 265 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); |
| 266 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); |
| 267 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); |
| 268 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); |
| 269 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); |
| 270 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); |
| 271 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); |
| 272 | |
| 273 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) |
| 274 | { |
| 275 | return kstrtoull_from_user(s, count, base, res); |
| 276 | } |
| 277 | |
| 278 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) |
| 279 | { |
| 280 | return kstrtoll_from_user(s, count, base, res); |
| 281 | } |
| 282 | |
| 283 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) |
| 284 | { |
| 285 | return kstrtouint_from_user(s, count, base, res); |
| 286 | } |
| 287 | |
| 288 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) |
| 289 | { |
| 290 | return kstrtoint_from_user(s, count, base, res); |
| 291 | } |
| 292 | |
Joe Perches | 67d0a07 | 2011-10-31 17:13:10 -0700 | [diff] [blame] | 293 | /* Obsolete, do not use. Use kstrto<foo> instead */ |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
| 296 | extern long simple_strtol(const char *,char **,unsigned int); |
| 297 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
| 298 | extern long long simple_strtoll(const char *,char **,unsigned int); |
Alexey Dobriyan | 33ee3b2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 299 | #define strict_strtoul kstrtoul |
| 300 | #define strict_strtol kstrtol |
| 301 | #define strict_strtoull kstrtoull |
| 302 | #define strict_strtoll kstrtoll |
| 303 | |
Joe Perches | 67d0a07 | 2011-10-31 17:13:10 -0700 | [diff] [blame] | 304 | /* lib/printf utilities */ |
| 305 | |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 306 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
| 307 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); |
| 308 | extern __printf(3, 4) |
| 309 | int snprintf(char *buf, size_t size, const char *fmt, ...); |
| 310 | extern __printf(3, 0) |
| 311 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); |
| 312 | extern __printf(3, 4) |
| 313 | int scnprintf(char *buf, size_t size, const char *fmt, ...); |
| 314 | extern __printf(3, 0) |
| 315 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); |
| 316 | extern __printf(2, 3) |
| 317 | char *kasprintf(gfp_t gfp, const char *fmt, ...); |
Jeremy Fitzhardinge | 11443ec | 2007-04-30 15:09:56 -0700 | [diff] [blame] | 318 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
| 320 | extern int sscanf(const char *, const char *, ...) |
| 321 | __attribute__ ((format (scanf, 2, 3))); |
| 322 | extern int vsscanf(const char *, const char *, va_list) |
| 323 | __attribute__ ((format (scanf, 2, 0))); |
| 324 | |
| 325 | extern int get_option(char **str, int *pint); |
| 326 | extern char *get_options(const char *str, int nints, int *ints); |
Jeremy Fitzhardinge | d974ae3 | 2008-07-24 16:27:46 -0700 | [diff] [blame] | 327 | extern unsigned long long memparse(const char *ptr, char **retptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 329 | extern int core_kernel_text(unsigned long addr); |
Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 330 | extern int core_kernel_data(unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | extern int __kernel_text_address(unsigned long addr); |
| 332 | extern int kernel_text_address(unsigned long addr); |
Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 333 | extern int func_ptr_is_kernel_text(void *ptr); |
Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 334 | |
Eric W. Biederman | 04a2e6a | 2007-02-12 00:52:56 -0800 | [diff] [blame] | 335 | struct pid; |
| 336 | extern struct pid *session_of_pgrp(struct pid *pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | unsigned long int_sqrt(unsigned long); |
| 339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | extern void bust_spinlocks(int yes); |
Kirill Korotaev | e3e8a75 | 2007-02-10 01:46:19 -0800 | [diff] [blame] | 341 | extern void wake_up_klogd(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | 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] | 343 | extern int panic_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | extern int panic_on_oops; |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 345 | extern int panic_on_unrecovered_nmi; |
Kurt Garloff | 5211a24 | 2009-06-24 14:32:11 -0700 | [diff] [blame] | 346 | extern int panic_on_io_nmi; |
Mitsuo Hayasaka | 55af779 | 2011-11-29 15:08:36 +0900 | [diff] [blame] | 347 | extern int sysctl_panic_on_stackoverflow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | extern const char *print_tainted(void); |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 349 | extern void add_taint(unsigned flag); |
| 350 | extern int test_taint(unsigned flag); |
| 351 | extern unsigned long get_taint(void); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 352 | extern int root_mountflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 354 | extern bool early_boot_irqs_disabled; |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | /* Values used for system_state */ |
| 357 | extern enum system_states { |
| 358 | SYSTEM_BOOTING, |
| 359 | SYSTEM_RUNNING, |
| 360 | SYSTEM_HALT, |
| 361 | SYSTEM_POWER_OFF, |
| 362 | SYSTEM_RESTART, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 363 | SYSTEM_SUSPEND_DISK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } system_state; |
| 365 | |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 366 | #define TAINT_PROPRIETARY_MODULE 0 |
| 367 | #define TAINT_FORCED_MODULE 1 |
| 368 | #define TAINT_UNSAFE_SMP 2 |
| 369 | #define TAINT_FORCED_RMMOD 3 |
| 370 | #define TAINT_MACHINE_CHECK 4 |
| 371 | #define TAINT_BAD_PAGE 5 |
| 372 | #define TAINT_USER 6 |
| 373 | #define TAINT_DIE 7 |
| 374 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 |
| 375 | #define TAINT_WARN 9 |
Linus Torvalds | 26e9a39 | 2008-10-17 09:50:12 -0700 | [diff] [blame] | 376 | #define TAINT_CRAP 10 |
Ben Hutchings | 92946bc | 2010-04-03 19:36:42 +0100 | [diff] [blame] | 377 | #define TAINT_FIRMWARE_WORKAROUND 11 |
Ben Hutchings | 2449b8b | 2011-10-24 15:12:28 +0200 | [diff] [blame] | 378 | #define TAINT_OOT_MODULE 12 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Harvey Harrison | 3fc9577 | 2008-05-14 16:05:49 -0700 | [diff] [blame] | 380 | extern const char hex_asc[]; |
| 381 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] |
| 382 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |
| 383 | |
Andy Shevchenko | 55036ba | 2011-10-31 17:12:41 -0700 | [diff] [blame] | 384 | static inline char *hex_byte_pack(char *buf, u8 byte) |
Harvey Harrison | 3fc9577 | 2008-05-14 16:05:49 -0700 | [diff] [blame] | 385 | { |
| 386 | *buf++ = hex_asc_hi(byte); |
| 387 | *buf++ = hex_asc_lo(byte); |
| 388 | return buf; |
| 389 | } |
Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 390 | |
Andy Shevchenko | 55036ba | 2011-10-31 17:12:41 -0700 | [diff] [blame] | 391 | static inline char * __deprecated pack_hex_byte(char *buf, u8 byte) |
| 392 | { |
| 393 | return hex_byte_pack(buf, byte); |
| 394 | } |
| 395 | |
Andy Shevchenko | 90378889 | 2010-05-24 14:33:23 -0700 | [diff] [blame] | 396 | extern int hex_to_bin(char ch); |
Mimi Zohar | b780498 | 2011-09-20 11:23:49 -0400 | [diff] [blame] | 397 | extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
Andy Shevchenko | 90378889 | 2010-05-24 14:33:23 -0700 | [diff] [blame] | 398 | |
Joe Perches | 8a64f33 | 2009-12-14 18:00:25 -0800 | [diff] [blame] | 399 | /* |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 400 | * General tracing related utility functions - trace_printk(), |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 401 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
| 402 | * |
| 403 | * Use tracing_on/tracing_off when you want to quickly turn on or off |
| 404 | * tracing. It simply enables or disables the recording of the trace events. |
GeunSik Lim | 156f5a7 | 2009-06-02 15:01:37 +0900 | [diff] [blame] | 405 | * 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] | 406 | * file, which gives a means for the kernel and userspace to interact. |
| 407 | * Place a tracing_off() in the kernel where you want tracing to end. |
| 408 | * From user space, examine the trace, and then echo 1 > tracing_on |
| 409 | * to continue tracing. |
| 410 | * |
| 411 | * tracing_stop/tracing_start has slightly more overhead. It is used |
| 412 | * by things like suspend to ram where disabling the recording of the |
| 413 | * trace is not enough, but tracing must actually stop because things |
| 414 | * like calling smp_processor_id() may crash the system. |
| 415 | * |
| 416 | * Most likely, you want to use tracing_on/tracing_off. |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 417 | */ |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 418 | #ifdef CONFIG_RING_BUFFER |
| 419 | void tracing_on(void); |
| 420 | void tracing_off(void); |
| 421 | /* trace_off_permanent stops recording with no way to bring it back */ |
| 422 | void tracing_off_permanent(void); |
| 423 | int tracing_is_on(void); |
| 424 | #else |
| 425 | static inline void tracing_on(void) { } |
| 426 | static inline void tracing_off(void) { } |
| 427 | static inline void tracing_off_permanent(void) { } |
| 428 | static inline int tracing_is_on(void) { return 0; } |
| 429 | #endif |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 430 | |
| 431 | enum ftrace_dump_mode { |
| 432 | DUMP_NONE, |
| 433 | DUMP_ALL, |
| 434 | DUMP_ORIG, |
| 435 | }; |
| 436 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 437 | #ifdef CONFIG_TRACING |
| 438 | extern void tracing_start(void); |
| 439 | extern void tracing_stop(void); |
| 440 | extern void ftrace_off_permanent(void); |
| 441 | |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 442 | static inline __printf(1, 2) |
| 443 | void ____trace_printk_check_format(const char *fmt, ...) |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 444 | { |
| 445 | } |
| 446 | #define __trace_printk_check_format(fmt, args...) \ |
| 447 | do { \ |
| 448 | if (0) \ |
| 449 | ____trace_printk_check_format(fmt, ##args); \ |
| 450 | } while (0) |
| 451 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 452 | /** |
| 453 | * trace_printk - printf formatting in the ftrace buffer |
| 454 | * @fmt: the printf format for printing |
| 455 | * |
| 456 | * Note: __trace_printk is an internal function for trace_printk and |
| 457 | * the @ip is passed in via the trace_printk macro. |
| 458 | * |
| 459 | * This function allows a kernel developer to debug fast path sections |
| 460 | * that printk is not appropriate for. By scattering in various |
| 461 | * printk like tracing in the code, a developer can quickly see |
| 462 | * where problems are occurring. |
| 463 | * |
| 464 | * This is intended as a debugging tool for the developer only. |
| 465 | * Please refrain from leaving trace_printks scattered around in |
| 466 | * your code. |
| 467 | */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 468 | |
| 469 | #define trace_printk(fmt, args...) \ |
| 470 | do { \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 471 | __trace_printk_check_format(fmt, ##args); \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 472 | if (__builtin_constant_p(fmt)) { \ |
| 473 | static const char *trace_printk_fmt \ |
| 474 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 475 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
| 476 | \ |
| 477 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
| 478 | } else \ |
| 479 | __trace_printk(_THIS_IP_, fmt, ##args); \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 480 | } while (0) |
| 481 | |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 482 | extern __printf(2, 3) |
| 483 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 484 | |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 485 | extern __printf(2, 3) |
| 486 | int __trace_printk(unsigned long ip, const char *fmt, ...); |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 487 | |
Steven Rostedt | 0388938 | 2009-12-11 09:48:22 -0500 | [diff] [blame] | 488 | extern void trace_dump_stack(void); |
| 489 | |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 490 | /* |
| 491 | * The double __builtin_constant_p is because gcc will give us an error |
| 492 | * if we try to allocate the static variable to fmt if it is not a |
| 493 | * constant. Even with the outer if statement. |
| 494 | */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 495 | #define ftrace_vprintk(fmt, vargs) \ |
| 496 | do { \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 497 | if (__builtin_constant_p(fmt)) { \ |
| 498 | static const char *trace_printk_fmt \ |
| 499 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 500 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
Ingo Molnar | 7bffc23 | 2009-03-09 10:11:36 +0100 | [diff] [blame] | 501 | \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 502 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
| 503 | } else \ |
| 504 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 505 | } while (0) |
| 506 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 507 | extern int |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 508 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
| 509 | |
| 510 | extern int |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 511 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 512 | |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 513 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 514 | #else |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 515 | static inline __printf(1, 2) |
| 516 | int trace_printk(const char *fmt, ...); |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 517 | |
| 518 | static inline void tracing_start(void) { } |
| 519 | static inline void tracing_stop(void) { } |
| 520 | static inline void ftrace_off_permanent(void) { } |
Steven Rostedt | e36c545 | 2009-12-14 15:58:33 -0500 | [diff] [blame] | 521 | static inline void trace_dump_stack(void) { } |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 522 | static inline int |
| 523 | trace_printk(const char *fmt, ...) |
| 524 | { |
| 525 | return 0; |
| 526 | } |
| 527 | static inline int |
| 528 | ftrace_vprintk(const char *fmt, va_list ap) |
| 529 | { |
| 530 | return 0; |
| 531 | } |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 532 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 533 | #endif /* CONFIG_TRACING */ |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 534 | |
| 535 | /* |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 536 | * min()/max()/clamp() macros that also do |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | * strict type-checking.. See the |
| 538 | * "unnecessary" pointer comparison. |
| 539 | */ |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 540 | #define min(x, y) ({ \ |
| 541 | typeof(x) _min1 = (x); \ |
| 542 | typeof(y) _min2 = (y); \ |
| 543 | (void) (&_min1 == &_min2); \ |
| 544 | _min1 < _min2 ? _min1 : _min2; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 546 | #define max(x, y) ({ \ |
| 547 | typeof(x) _max1 = (x); \ |
| 548 | typeof(y) _max2 = (y); \ |
| 549 | (void) (&_max1 == &_max2); \ |
| 550 | _max1 > _max2 ? _max1 : _max2; }) |
| 551 | |
Hagen Paul Pfeifer | f27c85c | 2010-10-26 14:22:21 -0700 | [diff] [blame] | 552 | #define min3(x, y, z) ({ \ |
| 553 | typeof(x) _min1 = (x); \ |
| 554 | typeof(y) _min2 = (y); \ |
| 555 | typeof(z) _min3 = (z); \ |
| 556 | (void) (&_min1 == &_min2); \ |
| 557 | (void) (&_min1 == &_min3); \ |
| 558 | _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ |
| 559 | (_min2 < _min3 ? _min2 : _min3); }) |
| 560 | |
| 561 | #define max3(x, y, z) ({ \ |
| 562 | typeof(x) _max1 = (x); \ |
| 563 | typeof(y) _max2 = (y); \ |
| 564 | typeof(z) _max3 = (z); \ |
| 565 | (void) (&_max1 == &_max2); \ |
| 566 | (void) (&_max1 == &_max3); \ |
| 567 | _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ |
| 568 | (_max2 > _max3 ? _max2 : _max3); }) |
| 569 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 570 | /** |
Martin K. Petersen | c8bf133 | 2010-09-10 20:07:38 +0200 | [diff] [blame] | 571 | * min_not_zero - return the minimum that is _not_ zero, unless both are zero |
| 572 | * @x: value1 |
| 573 | * @y: value2 |
| 574 | */ |
| 575 | #define min_not_zero(x, y) ({ \ |
| 576 | typeof(x) __x = (x); \ |
| 577 | typeof(y) __y = (y); \ |
| 578 | __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) |
| 579 | |
| 580 | /** |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 581 | * clamp - return a value clamped to a given range with strict typechecking |
| 582 | * @val: current value |
| 583 | * @min: minimum allowable value |
| 584 | * @max: maximum allowable value |
| 585 | * |
| 586 | * This macro does strict typechecking of min/max to make sure they are of the |
| 587 | * same type as val. See the unnecessary pointer comparisons. |
| 588 | */ |
| 589 | #define clamp(val, min, max) ({ \ |
| 590 | typeof(val) __val = (val); \ |
| 591 | typeof(min) __min = (min); \ |
| 592 | typeof(max) __max = (max); \ |
| 593 | (void) (&__val == &__min); \ |
| 594 | (void) (&__val == &__max); \ |
| 595 | __val = __val < __min ? __min: __val; \ |
| 596 | __val > __max ? __max: __val; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
| 598 | /* |
| 599 | * ..and if you can't take the strict |
| 600 | * types, you can specify one yourself. |
| 601 | * |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 602 | * Or not use min/max/clamp at all, of course. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | */ |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 604 | #define min_t(type, x, y) ({ \ |
| 605 | type __min1 = (x); \ |
| 606 | type __min2 = (y); \ |
| 607 | __min1 < __min2 ? __min1: __min2; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 609 | #define max_t(type, x, y) ({ \ |
| 610 | type __max1 = (x); \ |
| 611 | type __max2 = (y); \ |
| 612 | __max1 > __max2 ? __max1: __max2; }) |
| 613 | |
| 614 | /** |
| 615 | * clamp_t - return a value clamped to a given range using a given type |
| 616 | * @type: the type of variable to use |
| 617 | * @val: current value |
| 618 | * @min: minimum allowable value |
| 619 | * @max: maximum allowable value |
| 620 | * |
| 621 | * This macro does no typechecking and uses temporary variables of type |
| 622 | * 'type' to make all the comparisons. |
| 623 | */ |
| 624 | #define clamp_t(type, val, min, max) ({ \ |
| 625 | type __val = (val); \ |
| 626 | type __min = (min); \ |
| 627 | type __max = (max); \ |
| 628 | __val = __val < __min ? __min: __val; \ |
| 629 | __val > __max ? __max: __val; }) |
| 630 | |
| 631 | /** |
| 632 | * clamp_val - return a value clamped to a given range using val's type |
| 633 | * @val: current value |
| 634 | * @min: minimum allowable value |
| 635 | * @max: maximum allowable value |
| 636 | * |
| 637 | * This macro does no typechecking and uses temporary variables of whatever |
| 638 | * type the input argument 'val' is. This is useful when val is an unsigned |
| 639 | * type and min and max are literals that will otherwise be assigned a signed |
| 640 | * integer type. |
| 641 | */ |
| 642 | #define clamp_val(val, min, max) ({ \ |
| 643 | typeof(val) __val = (val); \ |
| 644 | typeof(val) __min = (min); \ |
| 645 | typeof(val) __max = (max); \ |
| 646 | __val = __val < __min ? __min: __val; \ |
| 647 | __val > __max ? __max: __val; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 649 | |
| 650 | /* |
| 651 | * swap - swap value of @a and @b |
| 652 | */ |
Peter Zijlstra | ac7b900 | 2009-02-04 15:11:59 -0800 | [diff] [blame] | 653 | #define swap(a, b) \ |
| 654 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) |
Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | /** |
| 657 | * 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] | 658 | * @ptr: the pointer to the member. |
| 659 | * @type: the type of the container struct this is embedded in. |
| 660 | * @member: the name of the member within the struct. |
| 661 | * |
| 662 | */ |
| 663 | #define container_of(ptr, type, member) ({ \ |
Daniel Walker | 78db2ad | 2007-05-12 16:28:35 -0700 | [diff] [blame] | 664 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 665 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
KOSAKI Motohiro | 903c0c7 | 2011-05-24 17:13:16 -0700 | [diff] [blame] | 667 | #ifdef __CHECKER__ |
| 668 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) |
Dr. David Alan Gilbert | ca39599 | 2011-06-15 15:08:27 -0700 | [diff] [blame] | 669 | #define BUILD_BUG_ON_ZERO(e) (0) |
| 670 | #define BUILD_BUG_ON_NULL(e) ((void*)0) |
KOSAKI Motohiro | 903c0c7 | 2011-05-24 17:13:16 -0700 | [diff] [blame] | 671 | #define BUILD_BUG_ON(condition) |
David Daney | 1399ff8 | 2012-01-10 15:07:25 -0800 | [diff] [blame] | 672 | #define BUILD_BUG() (0) |
KOSAKI Motohiro | 903c0c7 | 2011-05-24 17:13:16 -0700 | [diff] [blame] | 673 | #else /* __CHECKER__ */ |
| 674 | |
Roland Dreier | cc8ef6e | 2010-01-15 17:01:22 -0800 | [diff] [blame] | 675 | /* Force a compilation error if a constant expression is not a power of 2 */ |
| 676 | #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
| 677 | BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
| 678 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 679 | /* Force a compilation error if condition is true, but also produce a |
| 680 | result (of value 0 and type size_t), so the expression can be used |
| 681 | e.g. in a structure initializer (or where-ever else comma expressions |
| 682 | aren't permitted). */ |
Jan Beulich | 8c87df4 | 2009-09-22 16:43:52 -0700 | [diff] [blame] | 683 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
| 684 | #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 685 | |
Rusty Russell | 7ef88ad | 2011-01-24 14:45:10 -0600 | [diff] [blame] | 686 | /** |
| 687 | * BUILD_BUG_ON - break compile if a condition is true. |
Randy Dunlap | ffbbf2d | 2011-01-31 09:29:14 -0800 | [diff] [blame] | 688 | * @condition: the condition which the compiler should know is false. |
Rusty Russell | 7ef88ad | 2011-01-24 14:45:10 -0600 | [diff] [blame] | 689 | * |
| 690 | * If you have some code which relies on certain constants being equal, or |
| 691 | * other compile-time-evaluated condition, you should use BUILD_BUG_ON to |
| 692 | * detect if someone changes it. |
| 693 | * |
| 694 | * The implementation uses gcc's reluctance to create a negative array, but |
| 695 | * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments |
| 696 | * to inline functions). So as a fallback we use the optimizer; if it can't |
| 697 | * prove the condition is false, it will cause a link error on the undefined |
| 698 | * "__build_bug_on_failed". This error message can be harder to track down |
| 699 | * though, hence the two different methods. |
| 700 | */ |
| 701 | #ifndef __OPTIMIZE__ |
| 702 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
| 703 | #else |
| 704 | extern int __build_bug_on_failed; |
| 705 | #define BUILD_BUG_ON(condition) \ |
| 706 | do { \ |
| 707 | ((void)sizeof(char[1 - 2*!!(condition)])); \ |
| 708 | if (condition) __build_bug_on_failed = 1; \ |
| 709 | } while(0) |
| 710 | #endif |
David Daney | 1399ff8 | 2012-01-10 15:07:25 -0800 | [diff] [blame] | 711 | |
| 712 | /** |
| 713 | * BUILD_BUG - break compile if used. |
| 714 | * |
| 715 | * If you have some code that you expect the compiler to eliminate at |
| 716 | * build time, you should use BUILD_BUG to detect if it is |
| 717 | * unexpectedly used. |
| 718 | */ |
| 719 | #define BUILD_BUG() \ |
| 720 | do { \ |
| 721 | extern void __build_bug_failed(void) \ |
| 722 | __linktime_error("BUILD_BUG failed"); \ |
| 723 | __build_bug_failed(); \ |
| 724 | } while (0) |
| 725 | |
KOSAKI Motohiro | 903c0c7 | 2011-05-24 17:13:16 -0700 | [diff] [blame] | 726 | #endif /* __CHECKER__ */ |
Rusty Russell | 7ef88ad | 2011-01-24 14:45:10 -0600 | [diff] [blame] | 727 | |
Arnaud Lacombe | b9d4f42 | 2011-07-25 17:13:03 -0700 | [diff] [blame] | 728 | /* Trap pasters of __FUNCTION__ at compile-time */ |
| 729 | #define __FUNCTION__ (__func__) |
| 730 | |
| 731 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
| 732 | #ifdef CONFIG_NUMA |
| 733 | #define NUMA_BUILD 1 |
| 734 | #else |
| 735 | #define NUMA_BUILD 0 |
| 736 | #endif |
| 737 | |
| 738 | /* This helps us avoid #ifdef CONFIG_COMPACTION */ |
| 739 | #ifdef CONFIG_COMPACTION |
| 740 | #define COMPACTION_BUILD 1 |
| 741 | #else |
| 742 | #define COMPACTION_BUILD 0 |
| 743 | #endif |
| 744 | |
| 745 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
| 746 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 747 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
| 748 | #endif |
WANG Cong | 9d00f92 | 2011-07-25 17:13:02 -0700 | [diff] [blame] | 749 | |
WANG Cong | 9d00f92 | 2011-07-25 17:13:02 -0700 | [diff] [blame] | 750 | extern int do_sysinfo(struct sysinfo *info); |
| 751 | |
| 752 | #endif /* __KERNEL__ */ |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | #endif |