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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/kernel.h
1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
5 * 'kernel.h' contains some often-used function prototypes etc
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>
16 #include <asm/byteorder.h>
19 extern const char linux_banner
[];
21 #define INT_MAX ((int)(~0U>>1))
22 #define INT_MIN (-INT_MAX - 1)
23 #define UINT_MAX (~0U)
24 #define LONG_MAX ((long)(~0UL>>1))
25 #define LONG_MIN (-LONG_MAX - 1)
26 #define ULONG_MAX (~0UL)
28 #define STACK_MAGIC 0xdeadbeef
30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
31 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
33 #define KERN_EMERG "<0>" /* system is unusable */
34 #define KERN_ALERT "<1>" /* action must be taken immediately */
35 #define KERN_CRIT "<2>" /* critical conditions */
36 #define KERN_ERR "<3>" /* error conditions */
37 #define KERN_WARNING "<4>" /* warning conditions */
38 #define KERN_NOTICE "<5>" /* normal but significant condition */
39 #define KERN_INFO "<6>" /* informational */
40 #define KERN_DEBUG "<7>" /* debug-level messages */
42 extern int console_printk
[];
44 #define console_loglevel (console_printk[0])
45 #define default_message_loglevel (console_printk[1])
46 #define minimum_console_loglevel (console_printk[2])
47 #define default_console_loglevel (console_printk[3])
52 * might_sleep - annotation for functions that can sleep
54 * this macro will print a stack trace if it is executed in an atomic
55 * context (spinlock, irq-handler, ...).
57 * This is a useful debugging help to be able to catch problems early and not
58 * be biten later when the calling function happens to sleep when it is not
61 #ifdef CONFIG_PREEMPT_VOLUNTARY
62 extern int cond_resched(void);
63 # define might_resched() cond_resched()
65 # define might_resched() do { } while (0)
68 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
69 void __might_sleep(char *file
, int line
);
70 # define might_sleep() \
71 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
73 # define might_sleep() do { might_resched(); } while (0)
76 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
80 (__x < 0) ? -__x : __x; \
85 (__x < 0) ? -__x : __x; \
88 extern struct notifier_block
*panic_notifier_list
;
89 extern long (*panic_blink
)(long time
);
90 NORET_TYPE
void panic(const char * fmt
, ...)
91 __attribute__ ((NORET_AND
format (printf
, 1, 2)));
92 fastcall NORET_TYPE
void do_exit(long error_code
)
94 NORET_TYPE
void complete_and_exit(struct completion
*, long)
96 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
97 extern long simple_strtol(const char *,char **,unsigned int);
98 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
99 extern long long simple_strtoll(const char *,char **,unsigned int);
100 extern int sprintf(char * buf
, const char * fmt
, ...)
101 __attribute__ ((format (printf
, 2, 3)));
102 extern int vsprintf(char *buf
, const char *, va_list)
103 __attribute__ ((format (printf
, 2, 0)));
104 extern int snprintf(char * buf
, size_t size
, const char * fmt
, ...)
105 __attribute__ ((format (printf
, 3, 4)));
106 extern int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
107 __attribute__ ((format (printf
, 3, 0)));
108 extern int scnprintf(char * buf
, size_t size
, const char * fmt
, ...)
109 __attribute__ ((format (printf
, 3, 4)));
110 extern int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
111 __attribute__ ((format (printf
, 3, 0)));
113 extern int sscanf(const char *, const char *, ...)
114 __attribute__ ((format (scanf
, 2, 3)));
115 extern int vsscanf(const char *, const char *, va_list)
116 __attribute__ ((format (scanf
, 2, 0)));
118 extern int get_option(char **str
, int *pint
);
119 extern char *get_options(const char *str
, int nints
, int *ints
);
120 extern unsigned long long memparse(char *ptr
, char **retptr
);
122 extern int __kernel_text_address(unsigned long addr
);
123 extern int kernel_text_address(unsigned long addr
);
124 extern int session_of_pgrp(int pgrp
);
127 asmlinkage
int vprintk(const char *fmt
, va_list args
)
128 __attribute__ ((format (printf
, 1, 0)));
129 asmlinkage
int printk(const char * fmt
, ...)
130 __attribute__ ((format (printf
, 1, 2)));
132 static inline int vprintk(const char *s
, va_list args
)
133 __attribute__ ((format (printf
, 1, 0)));
134 static inline int vprintk(const char *s
, va_list args
) { return 0; }
135 static inline int printk(const char *s
, ...)
136 __attribute__ ((format (printf
, 1, 2)));
137 static inline int printk(const char *s
, ...) { return 0; }
140 unsigned long int_sqrt(unsigned long);
142 static inline int __attribute_pure__
long_log2(unsigned long x
)
145 for (x
>>= 1; x
> 0; x
>>= 1)
150 static inline unsigned long __attribute_const__
roundup_pow_of_two(unsigned long x
)
152 return (1UL << fls(x
- 1));
155 extern int printk_ratelimit(void);
156 extern int __printk_ratelimit(int ratelimit_jiffies
, int ratelimit_burst
);
158 static inline void console_silent(void)
160 console_loglevel
= 0;
163 static inline void console_verbose(void)
165 if (console_loglevel
)
166 console_loglevel
= 15;
169 extern void bust_spinlocks(int yes
);
170 extern int oops_in_progress
; /* If set, an oops, panic(), BUG() or die() is in progress */
171 extern int panic_timeout
;
172 extern int panic_on_oops
;
174 extern const char *print_tainted(void);
175 extern void add_taint(unsigned);
177 /* Values used for system_state */
178 extern enum system_states
{
186 #define TAINT_PROPRIETARY_MODULE (1<<0)
187 #define TAINT_FORCED_MODULE (1<<1)
188 #define TAINT_UNSAFE_SMP (1<<2)
189 #define TAINT_FORCED_RMMOD (1<<3)
190 #define TAINT_MACHINE_CHECK (1<<4)
191 #define TAINT_BAD_PAGE (1<<5)
193 extern void dump_stack(void);
196 #define pr_debug(fmt,arg...) \
197 printk(KERN_DEBUG fmt,##arg)
199 #define pr_debug(fmt,arg...) \
203 #define pr_info(fmt,arg...) \
204 printk(KERN_INFO fmt,##arg)
207 * Display an IP address in readable format.
210 #define NIPQUAD(addr) \
211 ((unsigned char *)&addr)[0], \
212 ((unsigned char *)&addr)[1], \
213 ((unsigned char *)&addr)[2], \
214 ((unsigned char *)&addr)[3]
217 ntohs((addr).s6_addr16[0]), \
218 ntohs((addr).s6_addr16[1]), \
219 ntohs((addr).s6_addr16[2]), \
220 ntohs((addr).s6_addr16[3]), \
221 ntohs((addr).s6_addr16[4]), \
222 ntohs((addr).s6_addr16[5]), \
223 ntohs((addr).s6_addr16[6]), \
224 ntohs((addr).s6_addr16[7])
226 #if defined(__LITTLE_ENDIAN)
227 #define HIPQUAD(addr) \
228 ((unsigned char *)&addr)[3], \
229 ((unsigned char *)&addr)[2], \
230 ((unsigned char *)&addr)[1], \
231 ((unsigned char *)&addr)[0]
232 #elif defined(__BIG_ENDIAN)
233 #define HIPQUAD NIPQUAD
235 #error "Please fix asm/byteorder.h"
236 #endif /* __LITTLE_ENDIAN */
239 * min()/max() macros that also do
240 * strict type-checking.. See the
241 * "unnecessary" pointer comparison.
243 #define min(x,y) ({ \
244 typeof(x) _x = (x); \
245 typeof(y) _y = (y); \
246 (void) (&_x == &_y); \
247 _x < _y ? _x : _y; })
249 #define max(x,y) ({ \
250 typeof(x) _x = (x); \
251 typeof(y) _y = (y); \
252 (void) (&_x == &_y); \
253 _x > _y ? _x : _y; })
256 * ..and if you can't take the strict
257 * types, you can specify one yourself.
259 * Or not use min/max at all, of course.
261 #define min_t(type,x,y) \
262 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
263 #define max_t(type,x,y) \
264 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
268 * container_of - cast a member of a structure out to the containing structure
270 * @ptr: the pointer to the member.
271 * @type: the type of the container struct this is embedded in.
272 * @member: the name of the member within the struct.
275 #define container_of(ptr, type, member) ({ \
276 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
277 (type *)( (char *)__mptr - offsetof(type,member) );})
280 * Check at compile time that something is of a particular type.
281 * Always evaluates to 1 so you may use it easily in comparisons.
283 #define typecheck(type,x) \
285 typeof(x) __dummy2; \
286 (void)(&__dummy == &__dummy2); \
290 #endif /* __KERNEL__ */
292 #define SI_LOAD_SHIFT 16
294 long uptime
; /* Seconds since boot */
295 unsigned long loads
[3]; /* 1, 5, and 15 minute load averages */
296 unsigned long totalram
; /* Total usable main memory size */
297 unsigned long freeram
; /* Available memory size */
298 unsigned long sharedram
; /* Amount of shared memory */
299 unsigned long bufferram
; /* Memory used by buffers */
300 unsigned long totalswap
; /* Total swap space size */
301 unsigned long freeswap
; /* swap space still available */
302 unsigned short procs
; /* Number of current processes */
303 unsigned short pad
; /* explicit padding for m68k */
304 unsigned long totalhigh
; /* Total high memory size */
305 unsigned long freehigh
; /* Available high memory size */
306 unsigned int mem_unit
; /* Memory unit size in bytes */
307 char _f
[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
310 extern void BUILD_BUG(void);
311 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
314 extern int randomize_va_space
;
316 #define randomize_va_space 1
319 /* Trap pasters of __FUNCTION__ at compile-time */
320 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
321 #define __FUNCTION__ (__func__)