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 | */ |
| 7 | |
| 8 | #ifdef __KERNEL__ |
| 9 | |
| 10 | #include <stdarg.h> |
| 11 | #include <linux/linkage.h> |
| 12 | #include <linux/stddef.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/compiler.h> |
| 15 | #include <linux/bitops.h> |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 16 | #include <linux/log2.h> |
Andrew Morton | e0deaff4 | 2008-07-25 01:45:24 -0700 | [diff] [blame] | 17 | #include <linux/typecheck.h> |
Dave Young | 717115e | 2008-07-25 01:45:58 -0700 | [diff] [blame] | 18 | #include <linux/ratelimit.h> |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 19 | #include <linux/dynamic_debug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/byteorder.h> |
| 21 | #include <asm/bug.h> |
| 22 | |
Roman Zippel | 3eb3c74 | 2007-01-10 14:45:28 +0100 | [diff] [blame] | 23 | extern const char linux_banner[]; |
| 24 | extern const char linux_proc_banner[]; |
| 25 | |
Zhang, Yanmin | 44f564a | 2008-04-29 01:00:55 -0700 | [diff] [blame] | 26 | #define USHORT_MAX ((u16)(~0U)) |
| 27 | #define SHORT_MAX ((s16)(USHORT_MAX>>1)) |
| 28 | #define SHORT_MIN (-SHORT_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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define STACK_MAGIC 0xdeadbeef |
| 40 | |
Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 41 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| 42 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
Matthew Wilcox | a83308e | 2007-09-11 15:23:47 -0700 | [diff] [blame] | 43 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
Herbert Xu | f10db62 | 2008-02-06 01:37:05 -0800 | [diff] [blame] | 44 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 45 | |
Rusty Russell | c5e631cf | 2007-05-06 14:51:05 -0700 | [diff] [blame] | 46 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
| 47 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 48 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
Steven Whitehouse | 930631e | 2006-09-25 23:32:40 -0700 | [diff] [blame] | 49 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
David Howells | b4cac1a | 2006-07-10 04:44:54 -0700 | [diff] [blame] | 50 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |
Darrick J. Wong | 9fe0608 | 2009-01-06 14:40:51 -0800 | [diff] [blame] | 51 | #define DIV_ROUND_CLOSEST(x, divisor)( \ |
| 52 | { \ |
| 53 | typeof(divisor) __divisor = divisor; \ |
| 54 | (((x) + ((__divisor) / 2)) / (__divisor)); \ |
| 55 | } \ |
| 56 | ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Eduard - Gabriel Munteanu | ca31e14 | 2008-07-05 12:14:23 +0300 | [diff] [blame] | 58 | #define _RET_IP_ (unsigned long)__builtin_return_address(0) |
| 59 | #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) |
| 60 | |
Bartlomiej Zolnierkiewicz | 90c699a | 2009-06-19 08:08:50 +0200 | [diff] [blame] | 61 | #ifdef CONFIG_LBDAF |
Jens Axboe | 2da96ac | 2007-10-12 12:40:38 +0200 | [diff] [blame] | 62 | # include <asm/div64.h> |
| 63 | # define sector_div(a, b) do_div(a, b) |
| 64 | #else |
| 65 | # define sector_div(n, b)( \ |
| 66 | { \ |
| 67 | int _res; \ |
| 68 | _res = (n) % (b); \ |
| 69 | (n) /= (b); \ |
| 70 | _res; \ |
| 71 | } \ |
| 72 | ) |
| 73 | #endif |
| 74 | |
Andrew Morton | 218e180 | 2007-05-10 03:15:18 -0700 | [diff] [blame] | 75 | /** |
| 76 | * upper_32_bits - return bits 32-63 of a number |
| 77 | * @n: the number we're accessing |
| 78 | * |
| 79 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
| 80 | * the "right shift count >= width of type" warning when that quantity is |
| 81 | * 32-bits. |
| 82 | */ |
| 83 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
| 84 | |
Joerg Roedel | 204b885 | 2008-07-29 22:33:42 -0700 | [diff] [blame] | 85 | /** |
| 86 | * lower_32_bits - return bits 0-31 of a number |
| 87 | * @n: the number we're accessing |
| 88 | */ |
| 89 | #define lower_32_bits(n) ((u32)(n)) |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | #define KERN_EMERG "<0>" /* system is unusable */ |
| 92 | #define KERN_ALERT "<1>" /* action must be taken immediately */ |
| 93 | #define KERN_CRIT "<2>" /* critical conditions */ |
| 94 | #define KERN_ERR "<3>" /* error conditions */ |
| 95 | #define KERN_WARNING "<4>" /* warning conditions */ |
| 96 | #define KERN_NOTICE "<5>" /* normal but significant condition */ |
| 97 | #define KERN_INFO "<6>" /* informational */ |
| 98 | #define KERN_DEBUG "<7>" /* debug-level messages */ |
| 99 | |
Linus Torvalds | e28d713 | 2009-06-16 11:02:28 -0700 | [diff] [blame] | 100 | /* Use the default kernel loglevel */ |
| 101 | #define KERN_DEFAULT "<d>" |
Ingo Molnar | 4749252 | 2007-10-16 23:30:29 -0700 | [diff] [blame] | 102 | /* |
| 103 | * Annotation for a "continued" line of log printout (only done after a |
| 104 | * line that had no enclosing \n). Only to be used by core/arch code |
| 105 | * during early bootup (a continued line is not SMP-safe otherwise). |
| 106 | */ |
Linus Torvalds | 5fd29d6 | 2009-06-16 10:57:02 -0700 | [diff] [blame] | 107 | #define KERN_CONT "<c>" |
Ingo Molnar | 4749252 | 2007-10-16 23:30:29 -0700 | [diff] [blame] | 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | extern int console_printk[]; |
| 110 | |
| 111 | #define console_loglevel (console_printk[0]) |
| 112 | #define default_message_loglevel (console_printk[1]) |
| 113 | #define minimum_console_loglevel (console_printk[2]) |
| 114 | #define default_console_loglevel (console_printk[3]) |
| 115 | |
| 116 | struct completion; |
akpm@osdl.org | df2e71f | 2006-01-09 20:51:37 -0800 | [diff] [blame] | 117 | struct pt_regs; |
| 118 | struct user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Uwe Kleine-König | 070cb06 | 2008-08-12 15:08:59 -0700 | [diff] [blame] | 120 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
| 121 | extern int _cond_resched(void); |
| 122 | # define might_resched() _cond_resched() |
| 123 | #else |
| 124 | # define might_resched() do { } while (0) |
| 125 | #endif |
| 126 | |
Randy Dunlap | 7106a27 | 2008-10-29 14:01:15 -0700 | [diff] [blame] | 127 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
Frederic Weisbecker | e4aafea | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 128 | void __might_sleep(char *file, int line, int preempt_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | /** |
| 130 | * might_sleep - annotation for functions that can sleep |
| 131 | * |
| 132 | * this macro will print a stack trace if it is executed in an atomic |
| 133 | * context (spinlock, irq-handler, ...). |
| 134 | * |
| 135 | * 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] | 136 | * 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] | 137 | * supposed to. |
| 138 | */ |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 139 | # define might_sleep() \ |
Frederic Weisbecker | e4aafea | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 140 | do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 141 | #else |
Frederic Weisbecker | e4aafea | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 142 | static inline void __might_sleep(char *file, int line, int preempt_offset) { } |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 143 | # define might_sleep() do { might_resched(); } while (0) |
| 144 | #endif |
| 145 | |
Hua Zhong | 368a5fa | 2006-06-23 02:05:42 -0700 | [diff] [blame] | 146 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | #define abs(x) ({ \ |
| 149 | int __x = (x); \ |
| 150 | (__x < 0) ? -__x : __x; \ |
| 151 | }) |
| 152 | |
Nick Piggin | 3ee1afa | 2008-09-10 13:37:17 +0200 | [diff] [blame] | 153 | #ifdef CONFIG_PROVE_LOCKING |
| 154 | void might_fault(void); |
| 155 | #else |
| 156 | static inline void might_fault(void) |
| 157 | { |
| 158 | might_sleep(); |
| 159 | } |
| 160 | #endif |
| 161 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 162 | extern struct atomic_notifier_head panic_notifier_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | extern long (*panic_blink)(long time); |
| 164 | NORET_TYPE void panic(const char * fmt, ...) |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 165 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 166 | extern void oops_enter(void); |
| 167 | extern void oops_exit(void); |
| 168 | extern int oops_may_print(void); |
Harvey Harrison | ec70158 | 2008-02-08 04:19:55 -0800 | [diff] [blame] | 169 | NORET_TYPE void do_exit(long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | ATTRIB_NORET; |
| 171 | NORET_TYPE void complete_and_exit(struct completion *, long) |
| 172 | ATTRIB_NORET; |
| 173 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
| 174 | extern long simple_strtol(const char *,char **,unsigned int); |
| 175 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
| 176 | extern long long simple_strtoll(const char *,char **,unsigned int); |
Yi Yang | 06b2a76 | 2008-02-08 04:21:57 -0800 | [diff] [blame] | 177 | extern int strict_strtoul(const char *, unsigned int, unsigned long *); |
| 178 | extern int strict_strtol(const char *, unsigned int, long *); |
| 179 | extern int strict_strtoull(const char *, unsigned int, unsigned long long *); |
| 180 | extern int strict_strtoll(const char *, unsigned int, long long *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | extern int sprintf(char * buf, const char * fmt, ...) |
| 182 | __attribute__ ((format (printf, 2, 3))); |
| 183 | extern int vsprintf(char *buf, const char *, va_list) |
| 184 | __attribute__ ((format (printf, 2, 0))); |
| 185 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
| 186 | __attribute__ ((format (printf, 3, 4))); |
| 187 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 188 | __attribute__ ((format (printf, 3, 0))); |
| 189 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
| 190 | __attribute__ ((format (printf, 3, 4))); |
| 191 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 192 | __attribute__ ((format (printf, 3, 0))); |
Jeremy Fitzhardinge | e905914 | 2006-06-25 05:49:17 -0700 | [diff] [blame] | 193 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
| 194 | __attribute__ ((format (printf, 2, 3))); |
Jeremy Fitzhardinge | 11443ec | 2007-04-30 15:09:56 -0700 | [diff] [blame] | 195 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | extern int sscanf(const char *, const char *, ...) |
| 198 | __attribute__ ((format (scanf, 2, 3))); |
| 199 | extern int vsscanf(const char *, const char *, va_list) |
| 200 | __attribute__ ((format (scanf, 2, 0))); |
| 201 | |
| 202 | extern int get_option(char **str, int *pint); |
| 203 | extern char *get_options(const char *str, int nints, int *ints); |
Jeremy Fitzhardinge | d974ae3 | 2008-07-24 16:27:46 -0700 | [diff] [blame] | 204 | extern unsigned long long memparse(const char *ptr, char **retptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 206 | extern int core_kernel_text(unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | extern int __kernel_text_address(unsigned long addr); |
| 208 | extern int kernel_text_address(unsigned long addr); |
Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 209 | extern int func_ptr_is_kernel_text(void *ptr); |
Arjan van de Ven | ab7476c | 2008-08-15 15:29:38 -0700 | [diff] [blame] | 210 | |
Eric W. Biederman | 04a2e6a | 2007-02-12 00:52:56 -0800 | [diff] [blame] | 211 | struct pid; |
| 212 | extern struct pid *session_of_pgrp(struct pid *pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Thomas Renninger | a0ad05c | 2008-09-01 14:27:02 +0200 | [diff] [blame] | 214 | /* |
| 215 | * FW_BUG |
| 216 | * Add this to a message where you are sure the firmware is buggy or behaves |
| 217 | * really stupid or out of spec. Be aware that the responsible BIOS developer |
| 218 | * should be able to fix this issue or at least get a concrete idea of the |
| 219 | * problem by reading your message without the need of looking at the kernel |
| 220 | * code. |
| 221 | * |
| 222 | * Use it for definite and high priority BIOS bugs. |
| 223 | * |
| 224 | * FW_WARN |
| 225 | * Use it for not that clear (e.g. could the kernel messed up things already?) |
| 226 | * and medium priority BIOS bugs. |
| 227 | * |
| 228 | * FW_INFO |
| 229 | * Use this one if you want to tell the user or vendor about something |
| 230 | * suspicious, but generally harmless related to the firmware. |
| 231 | * |
| 232 | * Use it for information or very low priority BIOS bugs. |
| 233 | */ |
| 234 | #define FW_BUG "[Firmware Bug]: " |
| 235 | #define FW_WARN "[Firmware Warn]: " |
| 236 | #define FW_INFO "[Firmware Info]: " |
| 237 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 238 | #ifdef CONFIG_PRINTK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | asmlinkage int vprintk(const char *fmt, va_list args) |
| 240 | __attribute__ ((format (printf, 1, 0))); |
| 241 | asmlinkage int printk(const char * fmt, ...) |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 242 | __attribute__ ((format (printf, 1, 2))) __cold; |
Joe Perches | 7ef3d2f | 2008-02-08 04:21:25 -0800 | [diff] [blame] | 243 | |
Dave Young | 717115e | 2008-07-25 01:45:58 -0700 | [diff] [blame] | 244 | extern struct ratelimit_state printk_ratelimit_state; |
Joe Perches | 7ef3d2f | 2008-02-08 04:21:25 -0800 | [diff] [blame] | 245 | extern int printk_ratelimit(void); |
Joe Perches | 7ef3d2f | 2008-02-08 04:21:25 -0800 | [diff] [blame] | 246 | extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, |
| 247 | unsigned int interval_msec); |
Ingo Molnar | f036be9 | 2009-02-05 13:45:43 +0100 | [diff] [blame] | 248 | |
| 249 | /* |
| 250 | * Print a one-time message (analogous to WARN_ONCE() et al): |
| 251 | */ |
| 252 | #define printk_once(x...) ({ \ |
| 253 | static int __print_once = 1; \ |
| 254 | \ |
| 255 | if (__print_once) { \ |
| 256 | __print_once = 0; \ |
| 257 | printk(x); \ |
| 258 | } \ |
| 259 | }) |
| 260 | |
Neil Horman | 04d491a | 2009-04-02 16:58:57 -0700 | [diff] [blame] | 261 | void log_buf_kexec_setup(void); |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 262 | #else |
| 263 | static inline int vprintk(const char *s, va_list args) |
| 264 | __attribute__ ((format (printf, 1, 0))); |
| 265 | static inline int vprintk(const char *s, va_list args) { return 0; } |
| 266 | static inline int printk(const char *s, ...) |
| 267 | __attribute__ ((format (printf, 1, 2))); |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 268 | static inline int __cold printk(const char *s, ...) { return 0; } |
Joe Perches | 7ef3d2f | 2008-02-08 04:21:25 -0800 | [diff] [blame] | 269 | static inline int printk_ratelimit(void) { return 0; } |
Joe Perches | 7ef3d2f | 2008-02-08 04:21:25 -0800 | [diff] [blame] | 270 | static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ |
| 271 | unsigned int interval_msec) \ |
| 272 | { return false; } |
Ingo Molnar | f036be9 | 2009-02-05 13:45:43 +0100 | [diff] [blame] | 273 | |
| 274 | /* No effect, but we still get type checking even in the !PRINTK case: */ |
| 275 | #define printk_once(x...) printk(x) |
| 276 | |
Neil Horman | 04d491a | 2009-04-02 16:58:57 -0700 | [diff] [blame] | 277 | static inline void log_buf_kexec_setup(void) |
| 278 | { |
| 279 | } |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 280 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Ingo Molnar | ced9cd4 | 2008-08-11 14:38:12 +0200 | [diff] [blame] | 282 | extern int printk_needs_cpu(int cpu); |
| 283 | extern void printk_tick(void); |
| 284 | |
Jiri Slaby | e17ba73 | 2008-05-12 15:44:40 +0200 | [diff] [blame] | 285 | extern void asmlinkage __attribute__((format(printf, 1, 2))) |
Ingo Molnar | 076f977 | 2008-01-30 13:33:06 +0100 | [diff] [blame] | 286 | early_printk(const char *fmt, ...); |
| 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | unsigned long int_sqrt(unsigned long); |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | static inline void console_silent(void) |
| 291 | { |
| 292 | console_loglevel = 0; |
| 293 | } |
| 294 | |
| 295 | static inline void console_verbose(void) |
| 296 | { |
| 297 | if (console_loglevel) |
| 298 | console_loglevel = 15; |
| 299 | } |
| 300 | |
| 301 | extern void bust_spinlocks(int yes); |
Kirill Korotaev | e3e8a75 | 2007-02-10 01:46:19 -0800 | [diff] [blame] | 302 | extern void wake_up_klogd(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | 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] | 304 | extern int panic_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | extern int panic_on_oops; |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 306 | extern int panic_on_unrecovered_nmi; |
Kurt Garloff | 5211a24 | 2009-06-24 14:32:11 -0700 | [diff] [blame] | 307 | extern int panic_on_io_nmi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | extern const char *print_tainted(void); |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 309 | extern void add_taint(unsigned flag); |
| 310 | extern int test_taint(unsigned flag); |
| 311 | extern unsigned long get_taint(void); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 312 | extern int root_mountflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | /* Values used for system_state */ |
| 315 | extern enum system_states { |
| 316 | SYSTEM_BOOTING, |
| 317 | SYSTEM_RUNNING, |
| 318 | SYSTEM_HALT, |
| 319 | SYSTEM_POWER_OFF, |
| 320 | SYSTEM_RESTART, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 321 | SYSTEM_SUSPEND_DISK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } system_state; |
| 323 | |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 324 | #define TAINT_PROPRIETARY_MODULE 0 |
| 325 | #define TAINT_FORCED_MODULE 1 |
| 326 | #define TAINT_UNSAFE_SMP 2 |
| 327 | #define TAINT_FORCED_RMMOD 3 |
| 328 | #define TAINT_MACHINE_CHECK 4 |
| 329 | #define TAINT_BAD_PAGE 5 |
| 330 | #define TAINT_USER 6 |
| 331 | #define TAINT_DIE 7 |
| 332 | #define TAINT_OVERRIDDEN_ACPI_TABLE 8 |
| 333 | #define TAINT_WARN 9 |
Linus Torvalds | 26e9a39 | 2008-10-17 09:50:12 -0700 | [diff] [blame] | 334 | #define TAINT_CRAP 10 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 336 | extern void dump_stack(void) __cold; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 338 | enum { |
| 339 | DUMP_PREFIX_NONE, |
| 340 | DUMP_PREFIX_ADDRESS, |
| 341 | DUMP_PREFIX_OFFSET |
| 342 | }; |
Randy Dunlap | c790923 | 2007-06-08 13:47:04 -0700 | [diff] [blame] | 343 | extern void hex_dump_to_buffer(const void *buf, size_t len, |
| 344 | int rowsize, int groupsize, |
| 345 | char *linebuf, size_t linebuflen, bool ascii); |
| 346 | extern void print_hex_dump(const char *level, const char *prefix_str, |
| 347 | int prefix_type, int rowsize, int groupsize, |
Artem Bityutskiy | 6a0ed91 | 2007-08-07 23:43:14 +0300 | [diff] [blame] | 348 | const void *buf, size_t len, bool ascii); |
Randy Dunlap | c790923 | 2007-06-08 13:47:04 -0700 | [diff] [blame] | 349 | extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
Alan Stern | eb9a9a5 | 2007-08-10 13:01:07 -0700 | [diff] [blame] | 350 | const void *buf, size_t len); |
Harvey Harrison | 3fc9577 | 2008-05-14 16:05:49 -0700 | [diff] [blame] | 351 | |
| 352 | extern const char hex_asc[]; |
| 353 | #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] |
| 354 | #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |
| 355 | |
| 356 | static inline char *pack_hex_byte(char *buf, u8 byte) |
| 357 | { |
| 358 | *buf++ = hex_asc_hi(byte); |
| 359 | *buf++ = hex_asc_lo(byte); |
| 360 | return buf; |
| 361 | } |
Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 362 | |
Martin Schwidefsky | d091c2f | 2008-11-12 21:16:43 +0100 | [diff] [blame] | 363 | #ifndef pr_fmt |
| 364 | #define pr_fmt(fmt) fmt |
| 365 | #endif |
| 366 | |
| 367 | #define pr_emerg(fmt, ...) \ |
| 368 | printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) |
| 369 | #define pr_alert(fmt, ...) \ |
| 370 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) |
| 371 | #define pr_crit(fmt, ...) \ |
| 372 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) |
| 373 | #define pr_err(fmt, ...) \ |
| 374 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) |
| 375 | #define pr_warning(fmt, ...) \ |
| 376 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) |
| 377 | #define pr_notice(fmt, ...) \ |
| 378 | printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) |
| 379 | #define pr_info(fmt, ...) \ |
| 380 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) |
Cyrill Gorcunov | 311d076 | 2009-03-31 15:23:51 -0700 | [diff] [blame] | 381 | #define pr_cont(fmt, ...) \ |
| 382 | printk(KERN_CONT fmt, ##__VA_ARGS__) |
Emil Medve | 1f7c823 | 2007-10-16 23:29:48 -0700 | [diff] [blame] | 383 | |
Michael Ellerman | 4ccb457 | 2009-04-09 14:48:24 -0700 | [diff] [blame] | 384 | /* pr_devel() should produce zero code unless DEBUG is defined */ |
| 385 | #ifdef DEBUG |
| 386 | #define pr_devel(fmt, ...) \ |
| 387 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
| 388 | #else |
| 389 | #define pr_devel(fmt, ...) \ |
| 390 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) |
| 391 | #endif |
| 392 | |
Pavel Machek | 1cc6daf | 2006-08-08 01:37:15 +0200 | [diff] [blame] | 393 | /* If you are writing a driver, please use dev_dbg instead */ |
Cornelia Huck | d0d85ff | 2008-12-04 16:55:47 +0100 | [diff] [blame] | 394 | #if defined(DEBUG) |
| 395 | #define pr_debug(fmt, ...) \ |
| 396 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 397 | #elif defined(CONFIG_DYNAMIC_DEBUG) |
Greg Banks | e6e66b0 | 2009-03-11 21:07:28 +1100 | [diff] [blame] | 398 | /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ |
Jason Baron | 346e15b | 2008-08-12 16:46:19 -0400 | [diff] [blame] | 399 | #define pr_debug(fmt, ...) do { \ |
Greg Banks | e6e66b0 | 2009-03-11 21:07:28 +1100 | [diff] [blame] | 400 | dynamic_pr_debug(fmt, ##__VA_ARGS__); \ |
Jason Baron | 346e15b | 2008-08-12 16:46:19 -0400 | [diff] [blame] | 401 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | #else |
Martin Schwidefsky | d091c2f | 2008-11-12 21:16:43 +0100 | [diff] [blame] | 403 | #define pr_debug(fmt, ...) \ |
| 404 | ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | #endif |
| 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | /* |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 408 | * General tracing related utility functions - trace_printk(), |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 409 | * tracing_on/tracing_off and tracing_start()/tracing_stop |
| 410 | * |
| 411 | * Use tracing_on/tracing_off when you want to quickly turn on or off |
| 412 | * tracing. It simply enables or disables the recording of the trace events. |
GeunSik Lim | 156f5a7 | 2009-06-02 15:01:37 +0900 | [diff] [blame] | 413 | * 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] | 414 | * file, which gives a means for the kernel and userspace to interact. |
| 415 | * Place a tracing_off() in the kernel where you want tracing to end. |
| 416 | * From user space, examine the trace, and then echo 1 > tracing_on |
| 417 | * to continue tracing. |
| 418 | * |
| 419 | * tracing_stop/tracing_start has slightly more overhead. It is used |
| 420 | * by things like suspend to ram where disabling the recording of the |
| 421 | * trace is not enough, but tracing must actually stop because things |
| 422 | * like calling smp_processor_id() may crash the system. |
| 423 | * |
| 424 | * Most likely, you want to use tracing_on/tracing_off. |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 425 | */ |
Steven Rostedt | 2002c25 | 2009-03-05 10:35:56 -0500 | [diff] [blame] | 426 | #ifdef CONFIG_RING_BUFFER |
| 427 | void tracing_on(void); |
| 428 | void tracing_off(void); |
| 429 | /* trace_off_permanent stops recording with no way to bring it back */ |
| 430 | void tracing_off_permanent(void); |
| 431 | int tracing_is_on(void); |
| 432 | #else |
| 433 | static inline void tracing_on(void) { } |
| 434 | static inline void tracing_off(void) { } |
| 435 | static inline void tracing_off_permanent(void) { } |
| 436 | static inline int tracing_is_on(void) { return 0; } |
| 437 | #endif |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 438 | #ifdef CONFIG_TRACING |
| 439 | extern void tracing_start(void); |
| 440 | extern void tracing_stop(void); |
| 441 | extern void ftrace_off_permanent(void); |
| 442 | |
| 443 | extern void |
| 444 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); |
| 445 | |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 446 | static inline void __attribute__ ((format (printf, 1, 2))) |
| 447 | ____trace_printk_check_format(const char *fmt, ...) |
| 448 | { |
| 449 | } |
| 450 | #define __trace_printk_check_format(fmt, args...) \ |
| 451 | do { \ |
| 452 | if (0) \ |
| 453 | ____trace_printk_check_format(fmt, ##args); \ |
| 454 | } while (0) |
| 455 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 456 | /** |
| 457 | * trace_printk - printf formatting in the ftrace buffer |
| 458 | * @fmt: the printf format for printing |
| 459 | * |
| 460 | * Note: __trace_printk is an internal function for trace_printk and |
| 461 | * the @ip is passed in via the trace_printk macro. |
| 462 | * |
| 463 | * This function allows a kernel developer to debug fast path sections |
| 464 | * that printk is not appropriate for. By scattering in various |
| 465 | * printk like tracing in the code, a developer can quickly see |
| 466 | * where problems are occurring. |
| 467 | * |
| 468 | * This is intended as a debugging tool for the developer only. |
| 469 | * Please refrain from leaving trace_printks scattered around in |
| 470 | * your code. |
| 471 | */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 472 | |
| 473 | #define trace_printk(fmt, args...) \ |
| 474 | do { \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 475 | __trace_printk_check_format(fmt, ##args); \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 476 | if (__builtin_constant_p(fmt)) { \ |
| 477 | static const char *trace_printk_fmt \ |
| 478 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 479 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
| 480 | \ |
| 481 | __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
| 482 | } else \ |
| 483 | __trace_printk(_THIS_IP_, fmt, ##args); \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 484 | } while (0) |
| 485 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 486 | extern int |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 487 | __trace_bprintk(unsigned long ip, const char *fmt, ...) |
| 488 | __attribute__ ((format (printf, 2, 3))); |
| 489 | |
| 490 | extern int |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 491 | __trace_printk(unsigned long ip, const char *fmt, ...) |
| 492 | __attribute__ ((format (printf, 2, 3))); |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 493 | |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 494 | /* |
| 495 | * The double __builtin_constant_p is because gcc will give us an error |
| 496 | * if we try to allocate the static variable to fmt if it is not a |
| 497 | * constant. Even with the outer if statement. |
| 498 | */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 499 | #define ftrace_vprintk(fmt, vargs) \ |
| 500 | do { \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 501 | if (__builtin_constant_p(fmt)) { \ |
| 502 | static const char *trace_printk_fmt \ |
| 503 | __attribute__((section("__trace_printk_fmt"))) = \ |
| 504 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
Ingo Molnar | 7bffc23 | 2009-03-09 10:11:36 +0100 | [diff] [blame] | 505 | \ |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 506 | __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
| 507 | } else \ |
| 508 | __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 509 | } while (0) |
| 510 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 511 | extern int |
Frederic Weisbecker | 48ead02 | 2009-03-12 18:24:49 +0100 | [diff] [blame] | 512 | __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
| 513 | |
| 514 | extern int |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 515 | __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 516 | |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 517 | extern void ftrace_dump(void); |
| 518 | #else |
| 519 | static inline void |
| 520 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } |
| 521 | static inline int |
| 522 | trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); |
| 523 | |
| 524 | static inline void tracing_start(void) { } |
| 525 | static inline void tracing_stop(void) { } |
| 526 | static inline void ftrace_off_permanent(void) { } |
| 527 | static inline int |
| 528 | trace_printk(const char *fmt, ...) |
| 529 | { |
| 530 | return 0; |
| 531 | } |
| 532 | static inline int |
| 533 | ftrace_vprintk(const char *fmt, va_list ap) |
| 534 | { |
| 535 | return 0; |
| 536 | } |
| 537 | static inline void ftrace_dump(void) { } |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 538 | #endif /* CONFIG_TRACING */ |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 539 | |
| 540 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | * Display an IP address in readable format. |
| 542 | */ |
| 543 | |
| 544 | #define NIPQUAD(addr) \ |
| 545 | ((unsigned char *)&addr)[0], \ |
| 546 | ((unsigned char *)&addr)[1], \ |
| 547 | ((unsigned char *)&addr)[2], \ |
| 548 | ((unsigned char *)&addr)[3] |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 549 | #define NIPQUAD_FMT "%u.%u.%u.%u" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | /* |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 552 | * min()/max()/clamp() macros that also do |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | * strict type-checking.. See the |
| 554 | * "unnecessary" pointer comparison. |
| 555 | */ |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 556 | #define min(x, y) ({ \ |
| 557 | typeof(x) _min1 = (x); \ |
| 558 | typeof(y) _min2 = (y); \ |
| 559 | (void) (&_min1 == &_min2); \ |
| 560 | _min1 < _min2 ? _min1 : _min2; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 562 | #define max(x, y) ({ \ |
| 563 | typeof(x) _max1 = (x); \ |
| 564 | typeof(y) _max2 = (y); \ |
| 565 | (void) (&_max1 == &_max2); \ |
| 566 | _max1 > _max2 ? _max1 : _max2; }) |
| 567 | |
| 568 | /** |
| 569 | * clamp - return a value clamped to a given range with strict typechecking |
| 570 | * @val: current value |
| 571 | * @min: minimum allowable value |
| 572 | * @max: maximum allowable value |
| 573 | * |
| 574 | * This macro does strict typechecking of min/max to make sure they are of the |
| 575 | * same type as val. See the unnecessary pointer comparisons. |
| 576 | */ |
| 577 | #define clamp(val, min, max) ({ \ |
| 578 | typeof(val) __val = (val); \ |
| 579 | typeof(min) __min = (min); \ |
| 580 | typeof(max) __max = (max); \ |
| 581 | (void) (&__val == &__min); \ |
| 582 | (void) (&__val == &__max); \ |
| 583 | __val = __val < __min ? __min: __val; \ |
| 584 | __val > __max ? __max: __val; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | /* |
| 587 | * ..and if you can't take the strict |
| 588 | * types, you can specify one yourself. |
| 589 | * |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 590 | * Or not use min/max/clamp at all, of course. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | */ |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 592 | #define min_t(type, x, y) ({ \ |
| 593 | type __min1 = (x); \ |
| 594 | type __min2 = (y); \ |
| 595 | __min1 < __min2 ? __min1: __min2; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Harvey Harrison | bdf4bba | 2008-04-30 00:54:55 -0700 | [diff] [blame] | 597 | #define max_t(type, x, y) ({ \ |
| 598 | type __max1 = (x); \ |
| 599 | type __max2 = (y); \ |
| 600 | __max1 > __max2 ? __max1: __max2; }) |
| 601 | |
| 602 | /** |
| 603 | * clamp_t - return a value clamped to a given range using a given type |
| 604 | * @type: the type of variable to use |
| 605 | * @val: current value |
| 606 | * @min: minimum allowable value |
| 607 | * @max: maximum allowable value |
| 608 | * |
| 609 | * This macro does no typechecking and uses temporary variables of type |
| 610 | * 'type' to make all the comparisons. |
| 611 | */ |
| 612 | #define clamp_t(type, val, min, max) ({ \ |
| 613 | type __val = (val); \ |
| 614 | type __min = (min); \ |
| 615 | type __max = (max); \ |
| 616 | __val = __val < __min ? __min: __val; \ |
| 617 | __val > __max ? __max: __val; }) |
| 618 | |
| 619 | /** |
| 620 | * clamp_val - return a value clamped to a given range using val's type |
| 621 | * @val: current value |
| 622 | * @min: minimum allowable value |
| 623 | * @max: maximum allowable value |
| 624 | * |
| 625 | * This macro does no typechecking and uses temporary variables of whatever |
| 626 | * type the input argument 'val' is. This is useful when val is an unsigned |
| 627 | * type and min and max are literals that will otherwise be assigned a signed |
| 628 | * integer type. |
| 629 | */ |
| 630 | #define clamp_val(val, min, max) ({ \ |
| 631 | typeof(val) __val = (val); \ |
| 632 | typeof(val) __min = (min); \ |
| 633 | typeof(val) __max = (max); \ |
| 634 | __val = __val < __min ? __min: __val; \ |
| 635 | __val > __max ? __max: __val; }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 637 | |
| 638 | /* |
| 639 | * swap - swap value of @a and @b |
| 640 | */ |
Peter Zijlstra | ac7b900 | 2009-02-04 15:11:59 -0800 | [diff] [blame] | 641 | #define swap(a, b) \ |
| 642 | do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) |
Wu Fengguang | 91f68b7 | 2009-01-07 18:09:12 -0800 | [diff] [blame] | 643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | /** |
| 645 | * 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] | 646 | * @ptr: the pointer to the member. |
| 647 | * @type: the type of the container struct this is embedded in. |
| 648 | * @member: the name of the member within the struct. |
| 649 | * |
| 650 | */ |
| 651 | #define container_of(ptr, type, member) ({ \ |
Daniel Walker | 78db2ad | 2007-05-12 16:28:35 -0700 | [diff] [blame] | 652 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 653 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Kyle McMartin | d4d23ad | 2007-02-10 01:46:00 -0800 | [diff] [blame] | 655 | struct sysinfo; |
| 656 | extern int do_sysinfo(struct sysinfo *info); |
| 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | #endif /* __KERNEL__ */ |
| 659 | |
| 660 | #define SI_LOAD_SHIFT 16 |
| 661 | struct sysinfo { |
| 662 | long uptime; /* Seconds since boot */ |
| 663 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
| 664 | unsigned long totalram; /* Total usable main memory size */ |
| 665 | unsigned long freeram; /* Available memory size */ |
| 666 | unsigned long sharedram; /* Amount of shared memory */ |
| 667 | unsigned long bufferram; /* Memory used by buffers */ |
| 668 | unsigned long totalswap; /* Total swap space size */ |
| 669 | unsigned long freeswap; /* swap space still available */ |
| 670 | unsigned short procs; /* Number of current processes */ |
| 671 | unsigned short pad; /* explicit padding for m68k */ |
| 672 | unsigned long totalhigh; /* Total high memory size */ |
| 673 | unsigned long freehigh; /* Available high memory size */ |
| 674 | unsigned int mem_unit; /* Memory unit size in bytes */ |
| 675 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
| 676 | }; |
| 677 | |
Nikita Danilov | c0398ee | 2005-10-30 15:03:10 -0800 | [diff] [blame] | 678 | /* Force a compilation error if condition is true */ |
Andi Kleen | 921717a | 2005-09-13 01:25:13 -0700 | [diff] [blame] | 679 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 681 | /* Force a compilation error if condition is true, but also produce a |
| 682 | result (of value 0 and type size_t), so the expression can be used |
| 683 | e.g. in a structure initializer (or where-ever else comma expressions |
| 684 | aren't permitted). */ |
| 685 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) |
| 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | /* Trap pasters of __FUNCTION__ at compile-time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | #define __FUNCTION__ (__func__) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Christoph Lameter | 08e0f6a | 2006-09-27 01:50:06 -0700 | [diff] [blame] | 690 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
| 691 | #ifdef CONFIG_NUMA |
| 692 | #define NUMA_BUILD 1 |
| 693 | #else |
| 694 | #define NUMA_BUILD 0 |
| 695 | #endif |
| 696 | |
Steven Rostedt | 29e71ab | 2008-08-14 15:45:10 -0400 | [diff] [blame] | 697 | /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
| 698 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 699 | # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
| 700 | #endif |
| 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | #endif |