| 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> | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 |  | 
| Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 26 | #define USHRT_MAX	((u16)(~0U)) | 
 | 27 | #define SHRT_MAX	((s16)(USHRT_MAX>>1)) | 
 | 28 | #define SHRT_MIN	((s16)(-SHRT_MAX - 1)) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #define INT_MAX		((int)(~0U>>1)) | 
 | 30 | #define INT_MIN		(-INT_MAX - 1) | 
 | 31 | #define UINT_MAX	(~0U) | 
 | 32 | #define LONG_MAX	((long)(~0UL>>1)) | 
 | 33 | #define LONG_MIN	(-LONG_MAX - 1) | 
 | 34 | #define ULONG_MAX	(~0UL) | 
| OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 35 | #define LLONG_MAX	((long long)(~0ULL>>1)) | 
 | 36 | #define LLONG_MIN	(-LLONG_MAX - 1) | 
 | 37 | #define ULLONG_MAX	(~0ULL) | 
| Xi Wang | a3860c1 | 2012-05-31 16:26:04 -0700 | [diff] [blame] | 38 | #define SIZE_MAX	(~(size_t)0) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 |  | 
 | 40 | #define STACK_MAGIC	0xdeadbeef | 
 | 41 |  | 
| David S. Miller | 4469690 | 2012-05-23 20:12:50 -0700 | [diff] [blame] | 42 | #define REPEAT_BYTE(x)	((~0ul / 0xff) * (x)) | 
 | 43 |  | 
| Alexey Dobriyan | a79ff73 | 2010-04-13 11:21:46 +0200 | [diff] [blame] | 44 | #define ALIGN(x, a)		__ALIGN_KERNEL((x), (a)) | 
| Alexey Dobriyan | 9f93ff5 | 2010-04-13 14:09:15 +0200 | [diff] [blame] | 45 | #define __ALIGN_MASK(x, mask)	__ALIGN_KERNEL_MASK((x), (mask)) | 
| Matthew Wilcox | a83308e | 2007-09-11 15:23:47 -0700 | [diff] [blame] | 46 | #define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a))) | 
| Herbert Xu | f10db62 | 2008-02-06 01:37:05 -0800 | [diff] [blame] | 47 | #define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0) | 
| Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 48 |  | 
| Rusty Russell | c5e631cf | 2007-05-06 14:51:05 -0700 | [diff] [blame] | 49 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) | 
 | 50 |  | 
| Yinghai Lu | 9b3be9f | 2010-02-10 01:20:29 -0800 | [diff] [blame] | 51 | /* | 
 | 52 |  * This looks more complex than it should be. But we need to | 
 | 53 |  * get the type for the ~ right in round_down (it needs to be | 
 | 54 |  * as wide as the result!), and we want to evaluate the macro | 
 | 55 |  * arguments just once each. | 
 | 56 |  */ | 
 | 57 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | 
 | 58 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) | 
 | 59 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) | 
 | 60 |  | 
| Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 61 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) | 
| Steven Whitehouse | 930631e | 2006-09-25 23:32:40 -0700 | [diff] [blame] | 62 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) | 
| Nicholas Bellinger | 36a26c6 | 2011-07-26 00:35:26 -0700 | [diff] [blame] | 63 | #define DIV_ROUND_UP_ULL(ll,d) \ | 
 | 64 | 	({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) | 
 | 65 |  | 
 | 66 | #if BITS_PER_LONG == 32 | 
 | 67 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) | 
 | 68 | #else | 
 | 69 | # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) | 
 | 70 | #endif | 
| James Morris | 074e61e | 2010-11-10 09:01:31 +1100 | [diff] [blame] | 71 |  | 
 | 72 | /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ | 
| Eric Paris | b28efd5 | 2010-10-13 17:50:08 -0400 | [diff] [blame] | 73 | #define roundup(x, y) (					\ | 
 | 74 | {							\ | 
| Tetsuo Handa | 6070bf3 | 2010-11-08 11:20:49 +0900 | [diff] [blame] | 75 | 	const typeof(y) __y = y;			\ | 
| Eric Paris | b28efd5 | 2010-10-13 17:50:08 -0400 | [diff] [blame] | 76 | 	(((x) + (__y - 1)) / __y) * __y;		\ | 
 | 77 | }							\ | 
 | 78 | ) | 
| Eric Paris | 686a0f3 | 2010-10-13 17:50:02 -0400 | [diff] [blame] | 79 | #define rounddown(x, y) (				\ | 
 | 80 | {							\ | 
 | 81 | 	typeof(x) __x = (x);				\ | 
 | 82 | 	__x - (__x % (y));				\ | 
 | 83 | }							\ | 
 | 84 | ) | 
| Darrick J. Wong | 9fe0608 | 2009-01-06 14:40:51 -0800 | [diff] [blame] | 85 | #define DIV_ROUND_CLOSEST(x, divisor)(			\ | 
 | 86 | {							\ | 
 | 87 | 	typeof(divisor) __divisor = divisor;		\ | 
 | 88 | 	(((x) + ((__divisor) / 2)) / (__divisor));	\ | 
 | 89 | }							\ | 
 | 90 | ) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 |  | 
| Salman Qazi | 9993bc63 | 2012-03-09 16:41:01 -0800 | [diff] [blame] | 92 | /* | 
 | 93 |  * Multiplies an integer by a fraction, while avoiding unnecessary | 
 | 94 |  * overflow or loss of precision. | 
 | 95 |  */ | 
 | 96 | #define mult_frac(x, numer, denom)(			\ | 
 | 97 | {							\ | 
 | 98 | 	typeof(x) quot = (x) / (denom);			\ | 
 | 99 | 	typeof(x) rem  = (x) % (denom);			\ | 
 | 100 | 	(quot * (numer)) + ((rem * (numer)) / (denom));	\ | 
 | 101 | }							\ | 
 | 102 | ) | 
 | 103 |  | 
 | 104 |  | 
| Eduard - Gabriel Munteanu | ca31e14 | 2008-07-05 12:14:23 +0300 | [diff] [blame] | 105 | #define _RET_IP_		(unsigned long)__builtin_return_address(0) | 
 | 106 | #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; }) | 
 | 107 |  | 
| Bartlomiej Zolnierkiewicz | 90c699a | 2009-06-19 08:08:50 +0200 | [diff] [blame] | 108 | #ifdef CONFIG_LBDAF | 
| Jens Axboe | 2da96ac | 2007-10-12 12:40:38 +0200 | [diff] [blame] | 109 | # include <asm/div64.h> | 
 | 110 | # define sector_div(a, b) do_div(a, b) | 
 | 111 | #else | 
 | 112 | # define sector_div(n, b)( \ | 
 | 113 | { \ | 
 | 114 | 	int _res; \ | 
 | 115 | 	_res = (n) % (b); \ | 
 | 116 | 	(n) /= (b); \ | 
 | 117 | 	_res; \ | 
 | 118 | } \ | 
 | 119 | ) | 
 | 120 | #endif | 
 | 121 |  | 
| Andrew Morton | 218e180 | 2007-05-10 03:15:18 -0700 | [diff] [blame] | 122 | /** | 
 | 123 |  * upper_32_bits - return bits 32-63 of a number | 
 | 124 |  * @n: the number we're accessing | 
 | 125 |  * | 
 | 126 |  * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress | 
 | 127 |  * the "right shift count >= width of type" warning when that quantity is | 
 | 128 |  * 32-bits. | 
 | 129 |  */ | 
 | 130 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | 
 | 131 |  | 
| Joerg Roedel | 204b885 | 2008-07-29 22:33:42 -0700 | [diff] [blame] | 132 | /** | 
 | 133 |  * lower_32_bits - return bits 0-31 of a number | 
 | 134 |  * @n: the number we're accessing | 
 | 135 |  */ | 
 | 136 | #define lower_32_bits(n) ((u32)(n)) | 
 | 137 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | struct completion; | 
| akpm@osdl.org | df2e71f | 2006-01-09 20:51:37 -0800 | [diff] [blame] | 139 | struct pt_regs; | 
 | 140 | struct user; | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 |  | 
| Uwe Kleine-König | 070cb06 | 2008-08-12 15:08:59 -0700 | [diff] [blame] | 142 | #ifdef CONFIG_PREEMPT_VOLUNTARY | 
 | 143 | extern int _cond_resched(void); | 
 | 144 | # define might_resched() _cond_resched() | 
 | 145 | #else | 
 | 146 | # define might_resched() do { } while (0) | 
 | 147 | #endif | 
 | 148 |  | 
| Frederic Weisbecker | d902db1 | 2011-06-08 19:31:56 +0200 | [diff] [blame] | 149 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP | 
| Simon Kagstrom | d894837 | 2009-12-23 11:08:18 +0100 | [diff] [blame] | 150 |   void __might_sleep(const char *file, int line, int preempt_offset); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /** | 
 | 152 |  * might_sleep - annotation for functions that can sleep | 
 | 153 |  * | 
 | 154 |  * this macro will print a stack trace if it is executed in an atomic | 
 | 155 |  * context (spinlock, irq-handler, ...). | 
 | 156 |  * | 
 | 157 |  * 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] | 158 |  * 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] | 159 |  * supposed to. | 
 | 160 |  */ | 
| Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 161 | # define might_sleep() \ | 
| Frederic Weisbecker | e4aafea | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 162 | 	do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) | 
| Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 163 | #else | 
| Simon Kagstrom | d894837 | 2009-12-23 11:08:18 +0100 | [diff] [blame] | 164 |   static inline void __might_sleep(const char *file, int line, | 
 | 165 | 				   int preempt_offset) { } | 
| Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 166 | # define might_sleep() do { might_resched(); } while (0) | 
 | 167 | #endif | 
 | 168 |  | 
| Hua Zhong | 368a5fa | 2006-06-23 02:05:42 -0700 | [diff] [blame] | 169 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) | 
| Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 170 |  | 
| Andrew Morton | 71a9048 | 2011-01-12 16:59:35 -0800 | [diff] [blame] | 171 | /* | 
 | 172 |  * abs() handles unsigned and signed longs, ints, shorts and chars.  For all | 
 | 173 |  * input types abs() returns a signed long. | 
 | 174 |  * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() | 
 | 175 |  * for those. | 
 | 176 |  */ | 
 | 177 | #define abs(x) ({						\ | 
 | 178 | 		long ret;					\ | 
 | 179 | 		if (sizeof(x) == sizeof(long)) {		\ | 
 | 180 | 			long __x = (x);				\ | 
 | 181 | 			ret = (__x < 0) ? -__x : __x;		\ | 
 | 182 | 		} else {					\ | 
 | 183 | 			int __x = (x);				\ | 
 | 184 | 			ret = (__x < 0) ? -__x : __x;		\ | 
 | 185 | 		}						\ | 
 | 186 | 		ret;						\ | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | 	}) | 
 | 188 |  | 
| Brian Behlendorf | 658716d | 2010-10-26 14:23:10 -0700 | [diff] [blame] | 189 | #define abs64(x) ({				\ | 
 | 190 | 		s64 __x = (x);			\ | 
 | 191 | 		(__x < 0) ? -__x : __x;		\ | 
 | 192 | 	}) | 
 | 193 |  | 
| Nick Piggin | 3ee1afa | 2008-09-10 13:37:17 +0200 | [diff] [blame] | 194 | #ifdef CONFIG_PROVE_LOCKING | 
 | 195 | void might_fault(void); | 
 | 196 | #else | 
 | 197 | static inline void might_fault(void) | 
 | 198 | { | 
 | 199 | 	might_sleep(); | 
 | 200 | } | 
 | 201 | #endif | 
 | 202 |  | 
| Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 203 | extern struct atomic_notifier_head panic_notifier_list; | 
| TAMUKI Shoichi | c7ff0d9 | 2010-08-10 18:03:28 -0700 | [diff] [blame] | 204 | extern long (*panic_blink)(int state); | 
| Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 205 | __printf(1, 2) | 
| Joe Perches | 4da4785 | 2012-01-12 17:17:13 -0800 | [diff] [blame] | 206 | void panic(const char *fmt, ...) | 
| Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 207 | 	__noreturn __cold; | 
| Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 208 | extern void oops_enter(void); | 
 | 209 | extern void oops_exit(void); | 
| Anton Blanchard | 863a604 | 2010-08-10 18:03:30 -0700 | [diff] [blame] | 210 | void print_oops_end_marker(void); | 
| Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 211 | extern int oops_may_print(void); | 
| Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 212 | void do_exit(long error_code) | 
| Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 213 | 	__noreturn; | 
| Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 214 | void complete_and_exit(struct completion *, long) | 
| Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 215 | 	__noreturn; | 
| Alexey Dobriyan | 33ee3b2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 216 |  | 
 | 217 | /* Internal, do not use. */ | 
 | 218 | int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); | 
 | 219 | int __must_check _kstrtol(const char *s, unsigned int base, long *res); | 
 | 220 |  | 
 | 221 | int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); | 
 | 222 | int __must_check kstrtoll(const char *s, unsigned int base, long long *res); | 
 | 223 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) | 
 | 224 | { | 
 | 225 | 	/* | 
 | 226 | 	 * We want to shortcut function call, but | 
 | 227 | 	 * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. | 
 | 228 | 	 */ | 
 | 229 | 	if (sizeof(unsigned long) == sizeof(unsigned long long) && | 
 | 230 | 	    __alignof__(unsigned long) == __alignof__(unsigned long long)) | 
 | 231 | 		return kstrtoull(s, base, (unsigned long long *)res); | 
 | 232 | 	else | 
 | 233 | 		return _kstrtoul(s, base, res); | 
 | 234 | } | 
 | 235 |  | 
 | 236 | static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) | 
 | 237 | { | 
 | 238 | 	/* | 
 | 239 | 	 * We want to shortcut function call, but | 
 | 240 | 	 * __builtin_types_compatible_p(long, long long) = 0. | 
 | 241 | 	 */ | 
 | 242 | 	if (sizeof(long) == sizeof(long long) && | 
 | 243 | 	    __alignof__(long) == __alignof__(long long)) | 
 | 244 | 		return kstrtoll(s, base, (long long *)res); | 
 | 245 | 	else | 
 | 246 | 		return _kstrtol(s, base, res); | 
 | 247 | } | 
 | 248 |  | 
 | 249 | int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); | 
 | 250 | int __must_check kstrtoint(const char *s, unsigned int base, int *res); | 
 | 251 |  | 
 | 252 | static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) | 
 | 253 | { | 
 | 254 | 	return kstrtoull(s, base, res); | 
 | 255 | } | 
 | 256 |  | 
 | 257 | static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) | 
 | 258 | { | 
 | 259 | 	return kstrtoll(s, base, res); | 
 | 260 | } | 
 | 261 |  | 
 | 262 | static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) | 
 | 263 | { | 
 | 264 | 	return kstrtouint(s, base, res); | 
 | 265 | } | 
 | 266 |  | 
 | 267 | static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) | 
 | 268 | { | 
 | 269 | 	return kstrtoint(s, base, res); | 
 | 270 | } | 
 | 271 |  | 
 | 272 | int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); | 
 | 273 | int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); | 
 | 274 | int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); | 
 | 275 | int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); | 
 | 276 |  | 
| Alexey Dobriyan | c196e32 | 2011-05-24 17:13:31 -0700 | [diff] [blame] | 277 | int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); | 
 | 278 | int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); | 
 | 279 | int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); | 
 | 280 | int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); | 
 | 281 | int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); | 
 | 282 | int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); | 
 | 283 | int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); | 
 | 284 | int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); | 
 | 285 | int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); | 
 | 286 | int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); | 
 | 287 |  | 
 | 288 | static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) | 
 | 289 | { | 
 | 290 | 	return kstrtoull_from_user(s, count, base, res); | 
 | 291 | } | 
 | 292 |  | 
 | 293 | static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) | 
 | 294 | { | 
 | 295 | 	return kstrtoll_from_user(s, count, base, res); | 
 | 296 | } | 
 | 297 |  | 
 | 298 | static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) | 
 | 299 | { | 
 | 300 | 	return kstrtouint_from_user(s, count, base, res); | 
 | 301 | } | 
 | 302 |  | 
 | 303 | static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) | 
 | 304 | { | 
 | 305 | 	return kstrtoint_from_user(s, count, base, res); | 
 | 306 | } | 
 | 307 |  | 
| Joe Perches | 67d0a07 | 2011-10-31 17:13:10 -0700 | [diff] [blame] | 308 | /* Obsolete, do not use.  Use kstrto<foo> instead */ | 
 | 309 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); | 
 | 311 | extern long simple_strtol(const char *,char **,unsigned int); | 
 | 312 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | 
 | 313 | extern long long simple_strtoll(const char *,char **,unsigned int); | 
| Alexey Dobriyan | 33ee3b2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 314 | #define strict_strtoul	kstrtoul | 
 | 315 | #define strict_strtol	kstrtol | 
 | 316 | #define strict_strtoull	kstrtoull | 
 | 317 | #define strict_strtoll	kstrtoll | 
 | 318 |  | 
| KAMEZAWA Hiroyuki | 1ac101a | 2012-03-23 15:02:54 -0700 | [diff] [blame] | 319 | extern int num_to_str(char *buf, int size, unsigned long long num); | 
 | 320 |  | 
| Joe Perches | 67d0a07 | 2011-10-31 17:13:10 -0700 | [diff] [blame] | 321 | /* lib/printf utilities */ | 
 | 322 |  | 
| Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 323 | extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); | 
 | 324 | extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); | 
 | 325 | extern __printf(3, 4) | 
 | 326 | int snprintf(char *buf, size_t size, const char *fmt, ...); | 
 | 327 | extern __printf(3, 0) | 
 | 328 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); | 
 | 329 | extern __printf(3, 4) | 
 | 330 | int scnprintf(char *buf, size_t size, const char *fmt, ...); | 
 | 331 | extern __printf(3, 0) | 
 | 332 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); | 
 | 333 | extern __printf(2, 3) | 
 | 334 | char *kasprintf(gfp_t gfp, const char *fmt, ...); | 
| Jeremy Fitzhardinge | 11443ec | 2007-04-30 15:09:56 -0700 | [diff] [blame] | 335 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 |  | 
| Joe Perches | 6061d94 | 2012-03-23 15:02:16 -0700 | [diff] [blame] | 337 | extern __scanf(2, 3) | 
 | 338 | int sscanf(const char *, const char *, ...); | 
 | 339 | extern __scanf(2, 0) | 
 | 340 | int vsscanf(const char *, const char *, va_list); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 |  | 
 | 342 | extern int get_option(char **str, int *pint); | 
 | 343 | extern char *get_options(const char *str, int nints, int *ints); | 
| Jeremy Fitzhardinge | d974ae3 | 2008-07-24 16:27:46 -0700 | [diff] [blame] | 344 | extern unsigned long long memparse(const char *ptr, char **retptr); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 |  | 
| Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 346 | extern int core_kernel_text(unsigned long addr); | 
| Steven Rostedt | cdbe61b | 2011-05-05 21:14:55 -0400 | [diff] [blame] | 347 | extern int core_kernel_data(unsigned long addr); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | extern int __kernel_text_address(unsigned long addr); | 
 | 349 | extern int kernel_text_address(unsigned long addr); | 
| Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 350 | extern int func_ptr_is_kernel_text(void *ptr); | 
| Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 351 |  | 
| Eric W. Biederman | 04a2e6a | 2007-02-12 00:52:56 -0800 | [diff] [blame] | 352 | struct pid; | 
 | 353 | extern struct pid *session_of_pgrp(struct pid *pgrp); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | unsigned long int_sqrt(unsigned long); | 
 | 356 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | extern void bust_spinlocks(int yes); | 
| Kirill Korotaev | e3e8a75 | 2007-02-10 01:46:19 -0800 | [diff] [blame] | 358 | extern void wake_up_klogd(void); | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | 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] | 360 | extern int panic_timeout; | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | extern int panic_on_oops; | 
| Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 362 | extern int panic_on_unrecovered_nmi; | 
| Kurt Garloff | 5211a24 | 2009-06-24 14:32:11 -0700 | [diff] [blame] | 363 | extern int panic_on_io_nmi; | 
| Mitsuo Hayasaka | 55af779 | 2011-11-29 15:08:36 +0900 | [diff] [blame] | 364 | extern int sysctl_panic_on_stackoverflow; | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | extern const char *print_tainted(void); | 
| Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 366 | extern void add_taint(unsigned flag); | 
 | 367 | extern int test_taint(unsigned flag); | 
 | 368 | extern unsigned long get_taint(void); | 
| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 369 | extern int root_mountflags; | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 |  | 
| Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 371 | extern bool early_boot_irqs_disabled; | 
 | 372 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | /* Values used for system_state */ | 
 | 374 | extern enum system_states { | 
 | 375 | 	SYSTEM_BOOTING, | 
 | 376 | 	SYSTEM_RUNNING, | 
 | 377 | 	SYSTEM_HALT, | 
 | 378 | 	SYSTEM_POWER_OFF, | 
 | 379 | 	SYSTEM_RESTART, | 
| Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 380 | 	SYSTEM_SUSPEND_DISK, | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | } system_state; | 
 | 382 |  | 
| Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 383 | #define TAINT_PROPRIETARY_MODULE	0 | 
 | 384 | #define TAINT_FORCED_MODULE		1 | 
 | 385 | #define TAINT_UNSAFE_SMP		2 | 
 | 386 | #define TAINT_FORCED_RMMOD		3 | 
 | 387 | #define TAINT_MACHINE_CHECK		4 | 
 | 388 | #define TAINT_BAD_PAGE			5 | 
 | 389 | #define TAINT_USER			6 | 
 | 390 | #define TAINT_DIE			7 | 
 | 391 | #define TAINT_OVERRIDDEN_ACPI_TABLE	8 | 
 | 392 | #define TAINT_WARN			9 | 
| Linus Torvalds | 26e9a39 | 2008-10-17 09:50:12 -0700 | [diff] [blame] | 393 | #define TAINT_CRAP			10 | 
| Ben Hutchings | 92946bc | 2010-04-03 19:36:42 +0100 | [diff] [blame] | 394 | #define TAINT_FIRMWARE_WORKAROUND	11 | 
| Ben Hutchings | 2449b8b | 2011-10-24 15:12:28 +0200 | [diff] [blame] | 395 | #define TAINT_OOT_MODULE		12 | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 |  | 
| Harvey Harrison | 3fc9577 | 2008-05-14 16:05:49 -0700 | [diff] [blame] | 397 | extern const char hex_asc[]; | 
 | 398 | #define hex_asc_lo(x)	hex_asc[((x) & 0x0f)] | 
 | 399 | #define hex_asc_hi(x)	hex_asc[((x) & 0xf0) >> 4] | 
 | 400 |  | 
| Andy Shevchenko | 55036ba | 2011-10-31 17:12:41 -0700 | [diff] [blame] | 401 | static inline char *hex_byte_pack(char *buf, u8 byte) | 
| Harvey Harrison | 3fc9577 | 2008-05-14 16:05:49 -0700 | [diff] [blame] | 402 | { | 
 | 403 | 	*buf++ = hex_asc_hi(byte); | 
 | 404 | 	*buf++ = hex_asc_lo(byte); | 
 | 405 | 	return buf; | 
 | 406 | } | 
| Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 407 |  | 
| Andy Shevchenko | 55036ba | 2011-10-31 17:12:41 -0700 | [diff] [blame] | 408 | static inline char * __deprecated pack_hex_byte(char *buf, u8 byte) | 
 | 409 | { | 
 | 410 | 	return hex_byte_pack(buf, byte); | 
 | 411 | } | 
 | 412 |  | 
| Andy Shevchenko | 90378889 | 2010-05-24 14:33:23 -0700 | [diff] [blame] | 413 | extern int hex_to_bin(char ch); | 
| Mimi Zohar | b780498 | 2011-09-20 11:23:49 -0400 | [diff] [blame] | 414 | 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] | 415 |  | 
| Joe Perches | 8a64f33 | 2009-12-14 18:00:25 -0800 | [diff] [blame] | 416 | /* | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 417 |  * General tracing related utility functions - trace_printk(), | 
| Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 418 |  * tracing_on/tracing_off and tracing_start()/tracing_stop | 
 | 419 |  * | 
 | 420 |  * Use tracing_on/tracing_off when you want to quickly turn on or off | 
 | 421 |  * tracing. It simply enables or disables the recording of the trace events. | 
| GeunSik Lim | 156f5a7 | 2009-06-02 15:01:37 +0900 | [diff] [blame] | 422 |  * 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] | 423 |  * file, which gives a means for the kernel and userspace to interact. | 
 | 424 |  * Place a tracing_off() in the kernel where you want tracing to end. | 
 | 425 |  * From user space, examine the trace, and then echo 1 > tracing_on | 
 | 426 |  * to continue tracing. | 
 | 427 |  * | 
 | 428 |  * tracing_stop/tracing_start has slightly more overhead. It is used | 
 | 429 |  * by things like suspend to ram where disabling the recording of the | 
 | 430 |  * trace is not enough, but tracing must actually stop because things | 
 | 431 |  * like calling smp_processor_id() may crash the system. | 
 | 432 |  * | 
 | 433 |  * Most likely, you want to use tracing_on/tracing_off. | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 434 |  */ | 
| Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 435 | #ifdef CONFIG_RING_BUFFER | 
| Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 436 | /* trace_off_permanent stops recording with no way to bring it back */ | 
 | 437 | void tracing_off_permanent(void); | 
| Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 438 | #else | 
| Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 439 | static inline void tracing_off_permanent(void) { } | 
| Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 440 | #endif | 
| Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 441 |  | 
 | 442 | enum ftrace_dump_mode { | 
 | 443 | 	DUMP_NONE, | 
 | 444 | 	DUMP_ALL, | 
 | 445 | 	DUMP_ORIG, | 
 | 446 | }; | 
 | 447 |  | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 448 | #ifdef CONFIG_TRACING | 
| Steven Rostedt | 93d68e5 | 2012-03-20 12:28:29 -0400 | [diff] [blame] | 449 | void tracing_on(void); | 
 | 450 | void tracing_off(void); | 
 | 451 | int tracing_is_on(void); | 
 | 452 |  | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 453 | extern void tracing_start(void); | 
 | 454 | extern void tracing_stop(void); | 
 | 455 | extern void ftrace_off_permanent(void); | 
 | 456 |  | 
| Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 457 | static inline __printf(1, 2) | 
 | 458 | void ____trace_printk_check_format(const char *fmt, ...) | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 459 | { | 
 | 460 | } | 
 | 461 | #define __trace_printk_check_format(fmt, args...)			\ | 
 | 462 | do {									\ | 
 | 463 | 	if (0)								\ | 
 | 464 | 		____trace_printk_check_format(fmt, ##args);		\ | 
 | 465 | } while (0) | 
 | 466 |  | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 467 | /** | 
 | 468 |  * trace_printk - printf formatting in the ftrace buffer | 
 | 469 |  * @fmt: the printf format for printing | 
 | 470 |  * | 
 | 471 |  * Note: __trace_printk is an internal function for trace_printk and | 
 | 472 |  *       the @ip is passed in via the trace_printk macro. | 
 | 473 |  * | 
 | 474 |  * This function allows a kernel developer to debug fast path sections | 
 | 475 |  * that printk is not appropriate for. By scattering in various | 
 | 476 |  * printk like tracing in the code, a developer can quickly see | 
 | 477 |  * where problems are occurring. | 
 | 478 |  * | 
 | 479 |  * This is intended as a debugging tool for the developer only. | 
 | 480 |  * Please refrain from leaving trace_printks scattered around in | 
 | 481 |  * your code. | 
 | 482 |  */ | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 483 |  | 
 | 484 | #define trace_printk(fmt, args...)					\ | 
 | 485 | do {									\ | 
| Steven Rostedt | 07d777f | 2011-09-22 14:01:55 -0400 | [diff] [blame] | 486 | 	static const char *trace_printk_fmt				\ | 
 | 487 | 		__attribute__((section("__trace_printk_fmt"))) =	\ | 
 | 488 | 		__builtin_constant_p(fmt) ? fmt : NULL;			\ | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 489 | 									\ | 
| Steven Rostedt | 07d777f | 2011-09-22 14:01:55 -0400 | [diff] [blame] | 490 | 	__trace_printk_check_format(fmt, ##args);			\ | 
 | 491 | 									\ | 
 | 492 | 	if (__builtin_constant_p(fmt))					\ | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 493 | 		__trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args);	\ | 
| Steven Rostedt | 07d777f | 2011-09-22 14:01:55 -0400 | [diff] [blame] | 494 | 	else								\ | 
 | 495 | 		__trace_printk(_THIS_IP_, fmt, ##args);			\ | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 496 | } while (0) | 
 | 497 |  | 
| Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 498 | extern __printf(2, 3) | 
 | 499 | int __trace_bprintk(unsigned long ip, const char *fmt, ...); | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 500 |  | 
| Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 501 | extern __printf(2, 3) | 
 | 502 | int __trace_printk(unsigned long ip, const char *fmt, ...); | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 503 |  | 
| Steven Rostedt | 0388938 | 2009-12-11 09:48:22 -0500 | [diff] [blame] | 504 | extern void trace_dump_stack(void); | 
 | 505 |  | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 506 | /* | 
 | 507 |  * The double __builtin_constant_p is because gcc will give us an error | 
 | 508 |  * if we try to allocate the static variable to fmt if it is not a | 
 | 509 |  * constant. Even with the outer if statement. | 
 | 510 |  */ | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 511 | #define ftrace_vprintk(fmt, vargs)					\ | 
 | 512 | do {									\ | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 513 | 	if (__builtin_constant_p(fmt)) {				\ | 
 | 514 | 		static const char *trace_printk_fmt			\ | 
 | 515 | 		  __attribute__((section("__trace_printk_fmt"))) =	\ | 
 | 516 | 			__builtin_constant_p(fmt) ? fmt : NULL;		\ | 
| Ingo Molnar | 7bffc23 | 2009-03-09 10:11:36 +0100 | [diff] [blame] | 517 | 									\ | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 518 | 		__ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs);	\ | 
 | 519 | 	} else								\ | 
 | 520 | 		__ftrace_vprintk(_THIS_IP_, fmt, vargs);		\ | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 521 | } while (0) | 
 | 522 |  | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 523 | extern int | 
| Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 524 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); | 
 | 525 |  | 
 | 526 | extern int | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 527 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 528 |  | 
| Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 529 | extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 530 | #else | 
| Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 531 | static inline __printf(1, 2) | 
 | 532 | int trace_printk(const char *fmt, ...); | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 533 |  | 
 | 534 | static inline void tracing_start(void) { } | 
 | 535 | static inline void tracing_stop(void) { } | 
 | 536 | static inline void ftrace_off_permanent(void) { } | 
| Steven Rostedt | e36c545 | 2009-12-14 15:58:33 -0500 | [diff] [blame] | 537 | static inline void trace_dump_stack(void) { } | 
| Steven Rostedt | 93d68e5 | 2012-03-20 12:28:29 -0400 | [diff] [blame] | 538 |  | 
 | 539 | static inline void tracing_on(void) { } | 
 | 540 | static inline void tracing_off(void) { } | 
 | 541 | static inline int tracing_is_on(void) { return 0; } | 
 | 542 |  | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 543 | static inline int | 
 | 544 | trace_printk(const char *fmt, ...) | 
 | 545 | { | 
 | 546 | 	return 0; | 
 | 547 | } | 
 | 548 | static inline int | 
 | 549 | ftrace_vprintk(const char *fmt, va_list ap) | 
 | 550 | { | 
 | 551 | 	return 0; | 
 | 552 | } | 
| Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 553 | static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } | 
| Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 554 | #endif /* CONFIG_TRACING */ | 
| Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 555 |  | 
 | 556 | /* | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 557 |  * min()/max()/clamp() macros that also do | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 |  * strict type-checking.. See the | 
 | 559 |  * "unnecessary" pointer comparison. | 
 | 560 |  */ | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 561 | #define min(x, y) ({				\ | 
 | 562 | 	typeof(x) _min1 = (x);			\ | 
 | 563 | 	typeof(y) _min2 = (y);			\ | 
 | 564 | 	(void) (&_min1 == &_min2);		\ | 
 | 565 | 	_min1 < _min2 ? _min1 : _min2; }) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 |  | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 567 | #define max(x, y) ({				\ | 
 | 568 | 	typeof(x) _max1 = (x);			\ | 
 | 569 | 	typeof(y) _max2 = (y);			\ | 
 | 570 | 	(void) (&_max1 == &_max2);		\ | 
 | 571 | 	_max1 > _max2 ? _max1 : _max2; }) | 
 | 572 |  | 
| Hagen Paul Pfeifer | f27c85c | 2010-10-26 14:22:21 -0700 | [diff] [blame] | 573 | #define min3(x, y, z) ({			\ | 
 | 574 | 	typeof(x) _min1 = (x);			\ | 
 | 575 | 	typeof(y) _min2 = (y);			\ | 
 | 576 | 	typeof(z) _min3 = (z);			\ | 
 | 577 | 	(void) (&_min1 == &_min2);		\ | 
 | 578 | 	(void) (&_min1 == &_min3);		\ | 
 | 579 | 	_min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ | 
 | 580 | 		(_min2 < _min3 ? _min2 : _min3); }) | 
 | 581 |  | 
 | 582 | #define max3(x, y, z) ({			\ | 
 | 583 | 	typeof(x) _max1 = (x);			\ | 
 | 584 | 	typeof(y) _max2 = (y);			\ | 
 | 585 | 	typeof(z) _max3 = (z);			\ | 
 | 586 | 	(void) (&_max1 == &_max2);		\ | 
 | 587 | 	(void) (&_max1 == &_max3);		\ | 
 | 588 | 	_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ | 
 | 589 | 		(_max2 > _max3 ? _max2 : _max3); }) | 
 | 590 |  | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 591 | /** | 
| Martin K. Petersen | c8bf133 | 2010-09-10 20:07:38 +0200 | [diff] [blame] | 592 |  * min_not_zero - return the minimum that is _not_ zero, unless both are zero | 
 | 593 |  * @x: value1 | 
 | 594 |  * @y: value2 | 
 | 595 |  */ | 
 | 596 | #define min_not_zero(x, y) ({			\ | 
 | 597 | 	typeof(x) __x = (x);			\ | 
 | 598 | 	typeof(y) __y = (y);			\ | 
 | 599 | 	__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) | 
 | 600 |  | 
 | 601 | /** | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 602 |  * clamp - return a value clamped to a given range with strict typechecking | 
 | 603 |  * @val: current value | 
 | 604 |  * @min: minimum allowable value | 
 | 605 |  * @max: maximum allowable value | 
 | 606 |  * | 
 | 607 |  * This macro does strict typechecking of min/max to make sure they are of the | 
 | 608 |  * same type as val.  See the unnecessary pointer comparisons. | 
 | 609 |  */ | 
 | 610 | #define clamp(val, min, max) ({			\ | 
 | 611 | 	typeof(val) __val = (val);		\ | 
 | 612 | 	typeof(min) __min = (min);		\ | 
 | 613 | 	typeof(max) __max = (max);		\ | 
 | 614 | 	(void) (&__val == &__min);		\ | 
 | 615 | 	(void) (&__val == &__max);		\ | 
 | 616 | 	__val = __val < __min ? __min: __val;	\ | 
 | 617 | 	__val > __max ? __max: __val; }) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 |  | 
 | 619 | /* | 
 | 620 |  * ..and if you can't take the strict | 
 | 621 |  * types, you can specify one yourself. | 
 | 622 |  * | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 623 |  * Or not use min/max/clamp at all, of course. | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 |  */ | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 625 | #define min_t(type, x, y) ({			\ | 
 | 626 | 	type __min1 = (x);			\ | 
 | 627 | 	type __min2 = (y);			\ | 
 | 628 | 	__min1 < __min2 ? __min1: __min2; }) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 |  | 
| Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 630 | #define max_t(type, x, y) ({			\ | 
 | 631 | 	type __max1 = (x);			\ | 
 | 632 | 	type __max2 = (y);			\ | 
 | 633 | 	__max1 > __max2 ? __max1: __max2; }) | 
 | 634 |  | 
 | 635 | /** | 
 | 636 |  * clamp_t - return a value clamped to a given range using a given type | 
 | 637 |  * @type: the type of variable to use | 
 | 638 |  * @val: current value | 
 | 639 |  * @min: minimum allowable value | 
 | 640 |  * @max: maximum allowable value | 
 | 641 |  * | 
 | 642 |  * This macro does no typechecking and uses temporary variables of type | 
 | 643 |  * 'type' to make all the comparisons. | 
 | 644 |  */ | 
 | 645 | #define clamp_t(type, val, min, max) ({		\ | 
 | 646 | 	type __val = (val);			\ | 
 | 647 | 	type __min = (min);			\ | 
 | 648 | 	type __max = (max);			\ | 
 | 649 | 	__val = __val < __min ? __min: __val;	\ | 
 | 650 | 	__val > __max ? __max: __val; }) | 
 | 651 |  | 
 | 652 | /** | 
 | 653 |  * clamp_val - return a value clamped to a given range using val's type | 
 | 654 |  * @val: current value | 
 | 655 |  * @min: minimum allowable value | 
 | 656 |  * @max: maximum allowable value | 
 | 657 |  * | 
 | 658 |  * This macro does no typechecking and uses temporary variables of whatever | 
 | 659 |  * type the input argument 'val' is.  This is useful when val is an unsigned | 
 | 660 |  * type and min and max are literals that will otherwise be assigned a signed | 
 | 661 |  * integer type. | 
 | 662 |  */ | 
 | 663 | #define clamp_val(val, min, max) ({		\ | 
 | 664 | 	typeof(val) __val = (val);		\ | 
 | 665 | 	typeof(val) __min = (min);		\ | 
 | 666 | 	typeof(val) __max = (max);		\ | 
 | 667 | 	__val = __val < __min ? __min: __val;	\ | 
 | 668 | 	__val > __max ? __max: __val; }) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 |  | 
| Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 670 |  | 
 | 671 | /* | 
 | 672 |  * swap - swap value of @a and @b | 
 | 673 |  */ | 
| Peter Zijlstra | ac7b900 | 2009-02-04 15:11:59 -0800 | [diff] [blame] | 674 | #define swap(a, b) \ | 
 | 675 | 	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) | 
| Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 676 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | /** | 
 | 678 |  * 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] | 679 |  * @ptr:	the pointer to the member. | 
 | 680 |  * @type:	the type of the container struct this is embedded in. | 
 | 681 |  * @member:	the name of the member within the struct. | 
 | 682 |  * | 
 | 683 |  */ | 
 | 684 | #define container_of(ptr, type, member) ({			\ | 
| Daniel Walker | 78db2ad | 2007-05-12 16:28:35 -0700 | [diff] [blame] | 685 | 	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\ | 
 | 686 | 	(type *)( (char *)__mptr - offsetof(type,member) );}) | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 |  | 
| Arnaud Lacombe | b9d4f42 | 2011-07-25 17:13:03 -0700 | [diff] [blame] | 688 | /* Trap pasters of __FUNCTION__ at compile-time */ | 
 | 689 | #define __FUNCTION__ (__func__) | 
 | 690 |  | 
 | 691 | /* This helps us to avoid #ifdef CONFIG_NUMA */ | 
 | 692 | #ifdef CONFIG_NUMA | 
 | 693 | #define NUMA_BUILD 1 | 
 | 694 | #else | 
 | 695 | #define NUMA_BUILD 0 | 
 | 696 | #endif | 
 | 697 |  | 
 | 698 | /* This helps us avoid #ifdef CONFIG_COMPACTION */ | 
 | 699 | #ifdef CONFIG_COMPACTION | 
 | 700 | #define COMPACTION_BUILD 1 | 
 | 701 | #else | 
 | 702 | #define COMPACTION_BUILD 0 | 
 | 703 | #endif | 
 | 704 |  | 
 | 705 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ | 
 | 706 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | 
 | 707 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD | 
 | 708 | #endif | 
| WANG Cong | 9d00f92 | 2011-07-25 17:13:02 -0700 | [diff] [blame] | 709 |  | 
| WANG Cong | 9d00f92 | 2011-07-25 17:13:02 -0700 | [diff] [blame] | 710 | extern int do_sysinfo(struct sysinfo *info); | 
 | 711 |  | 
 | 712 | #endif /* __KERNEL__ */ | 
 | 713 |  | 
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | #endif |