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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/byteorder.h> |
| 18 | #include <asm/bug.h> |
| 19 | |
Roman Zippel | 3eb3c74 | 2007-01-10 14:45:28 +0100 | [diff] [blame] | 20 | extern const char linux_banner[]; |
| 21 | extern const char linux_proc_banner[]; |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #define INT_MAX ((int)(~0U>>1)) |
| 24 | #define INT_MIN (-INT_MAX - 1) |
| 25 | #define UINT_MAX (~0U) |
| 26 | #define LONG_MAX ((long)(~0UL>>1)) |
| 27 | #define LONG_MIN (-LONG_MAX - 1) |
| 28 | #define ULONG_MAX (~0UL) |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 29 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
| 30 | #define LLONG_MIN (-LLONG_MAX - 1) |
| 31 | #define ULLONG_MAX (~0ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #define STACK_MAGIC 0xdeadbeef |
| 34 | |
Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 35 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| 36 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
Matthew Wilcox | a83308e | 2007-09-11 15:23:47 -0700 | [diff] [blame] | 37 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
Linus Torvalds | 2ea5814 | 2006-11-26 19:05:22 -0800 | [diff] [blame] | 38 | |
Rusty Russell | c5e631cf | 2007-05-06 14:51:05 -0700 | [diff] [blame] | 39 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
| 40 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 41 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
Steven Whitehouse | 930631e | 2006-09-25 23:32:40 -0700 | [diff] [blame] | 42 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
David Howells | b4cac1a | 2006-07-10 04:44:54 -0700 | [diff] [blame] | 43 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Andrew Morton | 218e180 | 2007-05-10 03:15:18 -0700 | [diff] [blame] | 45 | /** |
| 46 | * upper_32_bits - return bits 32-63 of a number |
| 47 | * @n: the number we're accessing |
| 48 | * |
| 49 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
| 50 | * the "right shift count >= width of type" warning when that quantity is |
| 51 | * 32-bits. |
| 52 | */ |
| 53 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define KERN_EMERG "<0>" /* system is unusable */ |
| 56 | #define KERN_ALERT "<1>" /* action must be taken immediately */ |
| 57 | #define KERN_CRIT "<2>" /* critical conditions */ |
| 58 | #define KERN_ERR "<3>" /* error conditions */ |
| 59 | #define KERN_WARNING "<4>" /* warning conditions */ |
| 60 | #define KERN_NOTICE "<5>" /* normal but significant condition */ |
| 61 | #define KERN_INFO "<6>" /* informational */ |
| 62 | #define KERN_DEBUG "<7>" /* debug-level messages */ |
| 63 | |
| 64 | extern int console_printk[]; |
| 65 | |
| 66 | #define console_loglevel (console_printk[0]) |
| 67 | #define default_message_loglevel (console_printk[1]) |
| 68 | #define minimum_console_loglevel (console_printk[2]) |
| 69 | #define default_console_loglevel (console_printk[3]) |
| 70 | |
| 71 | struct completion; |
akpm@osdl.org | df2e71f | 2006-01-09 20:51:37 -0800 | [diff] [blame] | 72 | struct pt_regs; |
| 73 | struct user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | /** |
| 76 | * might_sleep - annotation for functions that can sleep |
| 77 | * |
| 78 | * this macro will print a stack trace if it is executed in an atomic |
| 79 | * context (spinlock, irq-handler, ...). |
| 80 | * |
| 81 | * 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] | 82 | * 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] | 83 | * supposed to. |
| 84 | */ |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 85 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
| 86 | extern int cond_resched(void); |
| 87 | # define might_resched() cond_resched() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | #else |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 89 | # define might_resched() do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | #endif |
| 91 | |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 92 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
| 93 | void __might_sleep(char *file, int line); |
| 94 | # define might_sleep() \ |
| 95 | do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) |
| 96 | #else |
| 97 | # define might_sleep() do { might_resched(); } while (0) |
| 98 | #endif |
| 99 | |
Hua Zhong | 368a5fa | 2006-06-23 02:05:42 -0700 | [diff] [blame] | 100 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #define abs(x) ({ \ |
| 103 | int __x = (x); \ |
| 104 | (__x < 0) ? -__x : __x; \ |
| 105 | }) |
| 106 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 107 | extern struct atomic_notifier_head panic_notifier_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | extern long (*panic_blink)(long time); |
| 109 | NORET_TYPE void panic(const char * fmt, ...) |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 110 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 111 | extern void oops_enter(void); |
| 112 | extern void oops_exit(void); |
| 113 | extern int oops_may_print(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | fastcall NORET_TYPE void do_exit(long error_code) |
| 115 | ATTRIB_NORET; |
| 116 | NORET_TYPE void complete_and_exit(struct completion *, long) |
| 117 | ATTRIB_NORET; |
| 118 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
| 119 | extern long simple_strtol(const char *,char **,unsigned int); |
| 120 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
| 121 | extern long long simple_strtoll(const char *,char **,unsigned int); |
| 122 | extern int sprintf(char * buf, const char * fmt, ...) |
| 123 | __attribute__ ((format (printf, 2, 3))); |
| 124 | extern int vsprintf(char *buf, const char *, va_list) |
| 125 | __attribute__ ((format (printf, 2, 0))); |
| 126 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
| 127 | __attribute__ ((format (printf, 3, 4))); |
| 128 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 129 | __attribute__ ((format (printf, 3, 0))); |
| 130 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
| 131 | __attribute__ ((format (printf, 3, 4))); |
| 132 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 133 | __attribute__ ((format (printf, 3, 0))); |
Jeremy Fitzhardinge | e905914 | 2006-06-25 05:49:17 -0700 | [diff] [blame] | 134 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
| 135 | __attribute__ ((format (printf, 2, 3))); |
Jeremy Fitzhardinge | 11443ec | 2007-04-30 15:09:56 -0700 | [diff] [blame] | 136 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | extern int sscanf(const char *, const char *, ...) |
| 139 | __attribute__ ((format (scanf, 2, 3))); |
| 140 | extern int vsscanf(const char *, const char *, va_list) |
| 141 | __attribute__ ((format (scanf, 2, 0))); |
| 142 | |
| 143 | extern int get_option(char **str, int *pint); |
| 144 | extern char *get_options(const char *str, int nints, int *ints); |
| 145 | extern unsigned long long memparse(char *ptr, char **retptr); |
| 146 | |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 147 | extern int core_kernel_text(unsigned long addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | extern int __kernel_text_address(unsigned long addr); |
| 149 | extern int kernel_text_address(unsigned long addr); |
Eric W. Biederman | 04a2e6a | 2007-02-12 00:52:56 -0800 | [diff] [blame] | 150 | struct pid; |
| 151 | extern struct pid *session_of_pgrp(struct pid *pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
akpm@osdl.org | df2e71f | 2006-01-09 20:51:37 -0800 | [diff] [blame] | 153 | extern void dump_thread(struct pt_regs *regs, struct user *dump); |
| 154 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 155 | #ifdef CONFIG_PRINTK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | asmlinkage int vprintk(const char *fmt, va_list args) |
| 157 | __attribute__ ((format (printf, 1, 0))); |
| 158 | asmlinkage int printk(const char * fmt, ...) |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 159 | __attribute__ ((format (printf, 1, 2))) __cold; |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 160 | #else |
| 161 | static inline int vprintk(const char *s, va_list args) |
| 162 | __attribute__ ((format (printf, 1, 0))); |
| 163 | static inline int vprintk(const char *s, va_list args) { return 0; } |
| 164 | static inline int printk(const char *s, ...) |
| 165 | __attribute__ ((format (printf, 1, 2))); |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 166 | static inline int __cold printk(const char *s, ...) { return 0; } |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 167 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | unsigned long int_sqrt(unsigned long); |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | extern int printk_ratelimit(void); |
| 172 | extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); |
Andrew Morton | f46c483 | 2006-11-02 22:07:16 -0800 | [diff] [blame] | 173 | extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, |
| 174 | unsigned int interval_msec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
| 176 | static inline void console_silent(void) |
| 177 | { |
| 178 | console_loglevel = 0; |
| 179 | } |
| 180 | |
| 181 | static inline void console_verbose(void) |
| 182 | { |
| 183 | if (console_loglevel) |
| 184 | console_loglevel = 15; |
| 185 | } |
| 186 | |
| 187 | extern void bust_spinlocks(int yes); |
Kirill Korotaev | e3e8a75 | 2007-02-10 01:46:19 -0800 | [diff] [blame] | 188 | extern void wake_up_klogd(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | 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] | 190 | extern int panic_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | extern int panic_on_oops; |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 192 | extern int panic_on_unrecovered_nmi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | extern int tainted; |
| 194 | extern const char *print_tainted(void); |
| 195 | extern void add_taint(unsigned); |
| 196 | |
| 197 | /* Values used for system_state */ |
| 198 | extern enum system_states { |
| 199 | SYSTEM_BOOTING, |
| 200 | SYSTEM_RUNNING, |
| 201 | SYSTEM_HALT, |
| 202 | SYSTEM_POWER_OFF, |
| 203 | SYSTEM_RESTART, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 204 | SYSTEM_SUSPEND_DISK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } system_state; |
| 206 | |
| 207 | #define TAINT_PROPRIETARY_MODULE (1<<0) |
| 208 | #define TAINT_FORCED_MODULE (1<<1) |
| 209 | #define TAINT_UNSAFE_SMP (1<<2) |
| 210 | #define TAINT_FORCED_RMMOD (1<<3) |
| 211 | #define TAINT_MACHINE_CHECK (1<<4) |
| 212 | #define TAINT_BAD_PAGE (1<<5) |
Theodore Ts'o | 34f5a39 | 2007-02-10 01:45:24 -0800 | [diff] [blame] | 213 | #define TAINT_USER (1<<6) |
Pavel Emelianov | bcdcd8e | 2007-07-17 04:03:42 -0700 | [diff] [blame] | 214 | #define TAINT_DIE (1<<7) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Andi Kleen | a586df0 | 2007-07-21 17:10:00 +0200 | [diff] [blame] | 216 | extern void dump_stack(void) __cold; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 218 | enum { |
| 219 | DUMP_PREFIX_NONE, |
| 220 | DUMP_PREFIX_ADDRESS, |
| 221 | DUMP_PREFIX_OFFSET |
| 222 | }; |
Randy Dunlap | c790923 | 2007-06-08 13:47:04 -0700 | [diff] [blame] | 223 | extern void hex_dump_to_buffer(const void *buf, size_t len, |
| 224 | int rowsize, int groupsize, |
| 225 | char *linebuf, size_t linebuflen, bool ascii); |
| 226 | extern void print_hex_dump(const char *level, const char *prefix_str, |
| 227 | int prefix_type, int rowsize, int groupsize, |
Artem Bityutskiy | 6a0ed91 | 2007-08-07 23:43:14 +0300 | [diff] [blame] | 228 | const void *buf, size_t len, bool ascii); |
Randy Dunlap | c790923 | 2007-06-08 13:47:04 -0700 | [diff] [blame] | 229 | 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] | 230 | const void *buf, size_t len); |
Randy Dunlap | 99eaf3c | 2007-05-10 22:22:39 -0700 | [diff] [blame] | 231 | #define hex_asc(x) "0123456789abcdef"[x] |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | #ifdef DEBUG |
Pavel Machek | 1cc6daf | 2006-08-08 01:37:15 +0200 | [diff] [blame] | 234 | /* If you are writing a driver, please use dev_dbg instead */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | #define pr_debug(fmt,arg...) \ |
| 236 | printk(KERN_DEBUG fmt,##arg) |
| 237 | #else |
Zach Brown | 8b2a1fd | 2006-10-03 01:16:15 -0700 | [diff] [blame] | 238 | static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...) |
| 239 | { |
| 240 | return 0; |
| 241 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | #endif |
| 243 | |
| 244 | #define pr_info(fmt,arg...) \ |
| 245 | printk(KERN_INFO fmt,##arg) |
| 246 | |
| 247 | /* |
| 248 | * Display an IP address in readable format. |
| 249 | */ |
| 250 | |
| 251 | #define NIPQUAD(addr) \ |
| 252 | ((unsigned char *)&addr)[0], \ |
| 253 | ((unsigned char *)&addr)[1], \ |
| 254 | ((unsigned char *)&addr)[2], \ |
| 255 | ((unsigned char *)&addr)[3] |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 256 | #define NIPQUAD_FMT "%u.%u.%u.%u" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
| 258 | #define NIP6(addr) \ |
| 259 | ntohs((addr).s6_addr16[0]), \ |
| 260 | ntohs((addr).s6_addr16[1]), \ |
| 261 | ntohs((addr).s6_addr16[2]), \ |
| 262 | ntohs((addr).s6_addr16[3]), \ |
| 263 | ntohs((addr).s6_addr16[4]), \ |
| 264 | ntohs((addr).s6_addr16[5]), \ |
| 265 | ntohs((addr).s6_addr16[6]), \ |
| 266 | ntohs((addr).s6_addr16[7]) |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 267 | #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" |
YOSHIFUJI Hideaki | 9343e79 | 2006-01-17 02:10:53 -0800 | [diff] [blame] | 268 | #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | #if defined(__LITTLE_ENDIAN) |
| 271 | #define HIPQUAD(addr) \ |
| 272 | ((unsigned char *)&addr)[3], \ |
| 273 | ((unsigned char *)&addr)[2], \ |
| 274 | ((unsigned char *)&addr)[1], \ |
| 275 | ((unsigned char *)&addr)[0] |
| 276 | #elif defined(__BIG_ENDIAN) |
| 277 | #define HIPQUAD NIPQUAD |
| 278 | #else |
| 279 | #error "Please fix asm/byteorder.h" |
| 280 | #endif /* __LITTLE_ENDIAN */ |
| 281 | |
| 282 | /* |
| 283 | * min()/max() macros that also do |
| 284 | * strict type-checking.. See the |
| 285 | * "unnecessary" pointer comparison. |
| 286 | */ |
| 287 | #define min(x,y) ({ \ |
| 288 | typeof(x) _x = (x); \ |
| 289 | typeof(y) _y = (y); \ |
| 290 | (void) (&_x == &_y); \ |
| 291 | _x < _y ? _x : _y; }) |
| 292 | |
| 293 | #define max(x,y) ({ \ |
| 294 | typeof(x) _x = (x); \ |
| 295 | typeof(y) _y = (y); \ |
| 296 | (void) (&_x == &_y); \ |
| 297 | _x > _y ? _x : _y; }) |
| 298 | |
| 299 | /* |
| 300 | * ..and if you can't take the strict |
| 301 | * types, you can specify one yourself. |
| 302 | * |
| 303 | * Or not use min/max at all, of course. |
| 304 | */ |
| 305 | #define min_t(type,x,y) \ |
| 306 | ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) |
| 307 | #define max_t(type,x,y) \ |
| 308 | ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) |
| 309 | |
| 310 | |
| 311 | /** |
| 312 | * 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] | 313 | * @ptr: the pointer to the member. |
| 314 | * @type: the type of the container struct this is embedded in. |
| 315 | * @member: the name of the member within the struct. |
| 316 | * |
| 317 | */ |
| 318 | #define container_of(ptr, type, member) ({ \ |
Daniel Walker | 78db2ad | 2007-05-12 16:28:35 -0700 | [diff] [blame] | 319 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 320 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | /* |
| 323 | * Check at compile time that something is of a particular type. |
| 324 | * Always evaluates to 1 so you may use it easily in comparisons. |
| 325 | */ |
| 326 | #define typecheck(type,x) \ |
| 327 | ({ type __dummy; \ |
| 328 | typeof(x) __dummy2; \ |
| 329 | (void)(&__dummy == &__dummy2); \ |
| 330 | 1; \ |
| 331 | }) |
| 332 | |
Chuck Ebbert | 711a660 | 2006-01-09 15:59:17 -0800 | [diff] [blame] | 333 | /* |
| 334 | * Check at compile time that 'function' is a certain type, or is a pointer |
| 335 | * to that type (needs to use typedef for the function type.) |
| 336 | */ |
| 337 | #define typecheck_fn(type,function) \ |
| 338 | ({ typeof(type) __tmp = function; \ |
| 339 | (void)__tmp; \ |
| 340 | }) |
| 341 | |
Kyle McMartin | d4d23ad | 2007-02-10 01:46:00 -0800 | [diff] [blame] | 342 | struct sysinfo; |
| 343 | extern int do_sysinfo(struct sysinfo *info); |
| 344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | #endif /* __KERNEL__ */ |
| 346 | |
| 347 | #define SI_LOAD_SHIFT 16 |
| 348 | struct sysinfo { |
| 349 | long uptime; /* Seconds since boot */ |
| 350 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
| 351 | unsigned long totalram; /* Total usable main memory size */ |
| 352 | unsigned long freeram; /* Available memory size */ |
| 353 | unsigned long sharedram; /* Amount of shared memory */ |
| 354 | unsigned long bufferram; /* Memory used by buffers */ |
| 355 | unsigned long totalswap; /* Total swap space size */ |
| 356 | unsigned long freeswap; /* swap space still available */ |
| 357 | unsigned short procs; /* Number of current processes */ |
| 358 | unsigned short pad; /* explicit padding for m68k */ |
| 359 | unsigned long totalhigh; /* Total high memory size */ |
| 360 | unsigned long freehigh; /* Available high memory size */ |
| 361 | unsigned int mem_unit; /* Memory unit size in bytes */ |
| 362 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
| 363 | }; |
| 364 | |
Nikita Danilov | c0398ee | 2005-10-30 15:03:10 -0800 | [diff] [blame] | 365 | /* Force a compilation error if condition is true */ |
Andi Kleen | 921717a | 2005-09-13 01:25:13 -0700 | [diff] [blame] | 366 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 368 | /* Force a compilation error if condition is true, but also produce a |
| 369 | result (of value 0 and type size_t), so the expression can be used |
| 370 | e.g. in a structure initializer (or where-ever else comma expressions |
| 371 | aren't permitted). */ |
| 372 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) |
| 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | /* Trap pasters of __FUNCTION__ at compile-time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | #define __FUNCTION__ (__func__) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Christoph Lameter | 08e0f6a | 2006-09-27 01:50:06 -0700 | [diff] [blame] | 377 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
| 378 | #ifdef CONFIG_NUMA |
| 379 | #define NUMA_BUILD 1 |
| 380 | #else |
| 381 | #define NUMA_BUILD 0 |
| 382 | #endif |
| 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | #endif |