[net-next-2.6.git] / include / linux / kernel.h

#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H

/*
 * 'kernel.h' contains some often-used function prototypes etc
 */

#ifdef __KERNEL__

#include <stdarg.h>
#include <linux/linkage.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include <asm/byteorder.h>
#include <asm/bug.h>

extern const char linux_banner[];
extern const char linux_proc_banner[];

#define INT_MAX		((int)(~0U>>1))
#define INT_MIN		(-INT_MAX - 1)
#define UINT_MAX	(~0U)
#define LONG_MAX	((long)(~0UL>>1))
#define LONG_MIN	(-LONG_MAX - 1)
#define ULONG_MAX	(~0UL)
#define LLONG_MAX	((long long)(~0ULL>>1))
#define LLONG_MIN	(-LLONG_MAX - 1)
#define ULLONG_MAX	(~0ULL)

#define STACK_MAGIC	0xdeadbeef

#define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))

#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))

/**
 * upper_32_bits - return bits 32-63 of a number
 * @n: the number we're accessing
 *
 * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
 * the "right shift count >= width of type" warning when that quantity is
 * 32-bits.
 */
#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))

#define	KERN_EMERG	"<0>"	/* system is unusable			*/
#define	KERN_ALERT	"<1>"	/* action must be taken immediately	*/
#define	KERN_CRIT	"<2>"	/* critical conditions			*/
#define	KERN_ERR	"<3>"	/* error conditions			*/
#define	KERN_WARNING	"<4>"	/* warning conditions			*/
#define	KERN_NOTICE	"<5>"	/* normal but significant condition	*/
#define	KERN_INFO	"<6>"	/* informational			*/
#define	KERN_DEBUG	"<7>"	/* debug-level messages			*/

extern int console_printk[];

#define console_loglevel (console_printk[0])
#define default_message_loglevel (console_printk[1])
#define minimum_console_loglevel (console_printk[2])
#define default_console_loglevel (console_printk[3])

struct completion;
struct pt_regs;
struct user;

/**
 * might_sleep - annotation for functions that can sleep
 *
 * this macro will print a stack trace if it is executed in an atomic
 * context (spinlock, irq-handler, ...).
 *
 * This is a useful debugging help to be able to catch problems early and not
 * be bitten later when the calling function happens to sleep when it is not
 * supposed to.
 */
#ifdef CONFIG_PREEMPT_VOLUNTARY
extern int cond_resched(void);
# define might_resched() cond_resched()
#else
# define might_resched() do { } while (0)
#endif

#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
  void __might_sleep(char *file, int line);
# define might_sleep() \
	do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
#else
# define might_sleep() do { might_resched(); } while (0)
#endif

#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)

#define abs(x) ({				\
		int __x = (x);			\
		(__x < 0) ? -__x : __x;		\
	})

extern struct atomic_notifier_head panic_notifier_list;
extern long (*panic_blink)(long time);
NORET_TYPE void panic(const char * fmt, ...)
	__attribute__ ((NORET_AND format (printf, 1, 2)));
extern void oops_enter(void);
extern void oops_exit(void);
extern int oops_may_print(void);
fastcall NORET_TYPE void do_exit(long error_code)
	ATTRIB_NORET;
NORET_TYPE void complete_and_exit(struct completion *, long)
	ATTRIB_NORET;
extern unsigned long simple_strtoul(const char *,char **,unsigned int);
extern long simple_strtol(const char *,char **,unsigned int);
extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
extern long long simple_strtoll(const char *,char **,unsigned int);
extern int sprintf(char * buf, const char * fmt, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int vsprintf(char *buf, const char *, va_list)
	__attribute__ ((format (printf, 2, 0)));
extern int snprintf(char * buf, size_t size, const char * fmt, ...)
	__attribute__ ((format (printf, 3, 4)));
extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
	__attribute__ ((format (printf, 3, 0)));
extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
	__attribute__ ((format (printf, 3, 4)));
extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
	__attribute__ ((format (printf, 3, 0)));
extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
	__attribute__ ((format (printf, 2, 3)));
extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);

extern int sscanf(const char *, const char *, ...)
	__attribute__ ((format (scanf, 2, 3)));
extern int vsscanf(const char *, const char *, va_list)
	__attribute__ ((format (scanf, 2, 0)));

extern int get_option(char **str, int *pint);
extern char *get_options(const char *str, int nints, int *ints);
extern unsigned long long memparse(char *ptr, char **retptr);

extern int core_kernel_text(unsigned long addr);
extern int __kernel_text_address(unsigned long addr);
extern int kernel_text_address(unsigned long addr);
struct pid;
extern struct pid *session_of_pgrp(struct pid *pgrp);

extern void dump_thread(struct pt_regs *regs, struct user *dump);

#ifdef CONFIG_PRINTK
asmlinkage int vprintk(const char *fmt, va_list args)
	__attribute__ ((format (printf, 1, 0)));
asmlinkage int printk(const char * fmt, ...)
	__attribute__ ((format (printf, 1, 2)));
#else
static inline int vprintk(const char *s, va_list args)
	__attribute__ ((format (printf, 1, 0)));
static inline int vprintk(const char *s, va_list args) { return 0; }
static inline int printk(const char *s, ...)
	__attribute__ ((format (printf, 1, 2)));
static inline int printk(const char *s, ...) { return 0; }
#endif

unsigned long int_sqrt(unsigned long);

extern int printk_ratelimit(void);
extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
				unsigned int interval_msec);

static inline void console_silent(void)
{
	console_loglevel = 0;
}

static inline void console_verbose(void)
{
	if (console_loglevel)
		console_loglevel = 15;
}

extern void bust_spinlocks(int yes);
extern void wake_up_klogd(void);
extern int oops_in_progress;		/* If set, an oops, panic(), BUG() or die() is in progress */
extern int panic_timeout;
extern int panic_on_oops;
extern int panic_on_unrecovered_nmi;
extern int tainted;
extern const char *print_tainted(void);
extern void add_taint(unsigned);

/* Values used for system_state */
extern enum system_states {
	SYSTEM_BOOTING,
	SYSTEM_RUNNING,
	SYSTEM_HALT,
	SYSTEM_POWER_OFF,
	SYSTEM_RESTART,
	SYSTEM_SUSPEND_DISK,
} system_state;

#define TAINT_PROPRIETARY_MODULE	(1<<0)
#define TAINT_FORCED_MODULE		(1<<1)
#define TAINT_UNSAFE_SMP		(1<<2)
#define TAINT_FORCED_RMMOD		(1<<3)
#define TAINT_MACHINE_CHECK		(1<<4)
#define TAINT_BAD_PAGE			(1<<5)
#define TAINT_USER			(1<<6)

extern void dump_stack(void);

enum {
	DUMP_PREFIX_NONE,
	DUMP_PREFIX_ADDRESS,
	DUMP_PREFIX_OFFSET
};
extern void hex_dump_to_buffer(const void *buf, size_t len, char *linebuf,
				size_t linebuflen);
extern void print_hex_dump(const char *level, int prefix_type,
				void *buf, size_t len);
#define hex_asc(x)	"0123456789abcdef"[x]

#ifdef DEBUG
/* If you are writing a driver, please use dev_dbg instead */
#define pr_debug(fmt,arg...) \
	printk(KERN_DEBUG fmt,##arg)
#else
static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
{
	return 0;
}
#endif

#define pr_info(fmt,arg...) \
	printk(KERN_INFO fmt,##arg)

/*
 *      Display an IP address in readable format.
 */

#define NIPQUAD(addr) \
	((unsigned char *)&addr)[0], \
	((unsigned char *)&addr)[1], \
	((unsigned char *)&addr)[2], \
	((unsigned char *)&addr)[3]
#define NIPQUAD_FMT "%u.%u.%u.%u"

#define NIP6(addr) \
	ntohs((addr).s6_addr16[0]), \
	ntohs((addr).s6_addr16[1]), \
	ntohs((addr).s6_addr16[2]), \
	ntohs((addr).s6_addr16[3]), \
	ntohs((addr).s6_addr16[4]), \
	ntohs((addr).s6_addr16[5]), \
	ntohs((addr).s6_addr16[6]), \
	ntohs((addr).s6_addr16[7])
#define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
#define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"

#if defined(__LITTLE_ENDIAN)
#define HIPQUAD(addr) \
	((unsigned char *)&addr)[3], \
	((unsigned char *)&addr)[2], \
	((unsigned char *)&addr)[1], \
	((unsigned char *)&addr)[0]
#elif defined(__BIG_ENDIAN)
#define HIPQUAD	NIPQUAD
#else
#error "Please fix asm/byteorder.h"
#endif /* __LITTLE_ENDIAN */

/*
 * min()/max() macros that also do
 * strict type-checking.. See the
 * "unnecessary" pointer comparison.
 */
#define min(x,y) ({ \
	typeof(x) _x = (x);	\
	typeof(y) _y = (y);	\
	(void) (&_x == &_y);		\
	_x < _y ? _x : _y; })

#define max(x,y) ({ \
	typeof(x) _x = (x);	\
	typeof(y) _y = (y);	\
	(void) (&_x == &_y);		\
	_x > _y ? _x : _y; })

/*
 * ..and if you can't take the strict
 * types, you can specify one yourself.
 *
 * Or not use min/max at all, of course.
 */
#define min_t(type,x,y) \
	({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
#define max_t(type,x,y) \
	({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })


/**
 * container_of - cast a member of a structure out to the containing structure
 * @ptr:	the pointer to the member.
 * @type:	the type of the container struct this is embedded in.
 * @member:	the name of the member within the struct.
 *
 */
#define container_of(ptr, type, member) ({			\
        const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
        (type *)( (char *)__mptr - offsetof(type,member) );})

/*
 * Check at compile time that something is of a particular type.
 * Always evaluates to 1 so you may use it easily in comparisons.
 */
#define typecheck(type,x) \
({	type __dummy; \
	typeof(x) __dummy2; \
	(void)(&__dummy == &__dummy2); \
	1; \
})

/*
 * Check at compile time that 'function' is a certain type, or is a pointer
 * to that type (needs to use typedef for the function type.)
 */
#define typecheck_fn(type,function) \
({	typeof(type) __tmp = function; \
	(void)__tmp; \
})

struct sysinfo;
extern int do_sysinfo(struct sysinfo *info);

#endif /* __KERNEL__ */

#define SI_LOAD_SHIFT	16
struct sysinfo {
	long uptime;			/* Seconds since boot */
	unsigned long loads[3];		/* 1, 5, and 15 minute load averages */
	unsigned long totalram;		/* Total usable main memory size */
	unsigned long freeram;		/* Available memory size */
	unsigned long sharedram;	/* Amount of shared memory */
	unsigned long bufferram;	/* Memory used by buffers */
	unsigned long totalswap;	/* Total swap space size */
	unsigned long freeswap;		/* swap space still available */
	unsigned short procs;		/* Number of current processes */
	unsigned short pad;		/* explicit padding for m68k */
	unsigned long totalhigh;	/* Total high memory size */
	unsigned long freehigh;		/* Available high memory size */
	unsigned int mem_unit;		/* Memory unit size in bytes */
	char _f[20-2*sizeof(long)-sizeof(int)];	/* Padding: libc5 uses this.. */
};

/* Force a compilation error if condition is true */
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

/* Force a compilation error if condition is true, but also produce a
   result (of value 0 and type size_t), so the expression can be used
   e.g. in a structure initializer (or where-ever else comma expressions
   aren't permitted). */
#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)

/* Trap pasters of __FUNCTION__ at compile-time */
#define __FUNCTION__ (__func__)

/* This helps us to avoid #ifdef CONFIG_NUMA */
#ifdef CONFIG_NUMA
#define NUMA_BUILD 1
#else
#define NUMA_BUILD 0
#endif

#endif
Commit	Line	Data
1da177e4 LT	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>
f0d1b0b3	16	#include <linux/log2.h>
1da177e4 LT	17	#include <asm/byteorder.h>
	18	#include <asm/bug.h>
	19
3eb3c740 RZ	20	extern const char linux_banner[];
	21	extern const char linux_proc_banner[];
	22
1da177e4 LT	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)
111ebb6e OH	29	#define LLONG_MAX ((long long)(~0ULL>>1))
	30	#define LLONG_MIN (-LLONG_MAX - 1)
	31	#define ULLONG_MAX (~0ULL)
1da177e4 LT	32
	33	#define STACK_MAGIC 0xdeadbeef
	34
2ea58144 LT	35	#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
	36	#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
	37
c5e631cf RR	38	#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
c5e631cf RR	39
4552d5dc	40	#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
930631ed	41	#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
b4cac1a0	42	#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
1da177e4	43
218e180e AM	44	/**
	45	* upper_32_bits - return bits 32-63 of a number
	46	* @n: the number we're accessing
	47	*
	48	* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
	49	* the "right shift count >= width of type" warning when that quantity is
	50	* 32-bits.
	51	*/
	52	#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
	53
1da177e4 LT	54	#define KERN_EMERG "<0>" /* system is unusable */
	55	#define KERN_ALERT "<1>" /* action must be taken immediately */
	56	#define KERN_CRIT "<2>" /* critical conditions */
	57	#define KERN_ERR "<3>" /* error conditions */
	58	#define KERN_WARNING "<4>" /* warning conditions */
	59	#define KERN_NOTICE "<5>" /* normal but significant condition */
	60	#define KERN_INFO "<6>" /* informational */
	61	#define KERN_DEBUG "<7>" /* debug-level messages */
	62
	63	extern int console_printk[];
	64
	65	#define console_loglevel (console_printk[0])
	66	#define default_message_loglevel (console_printk[1])
	67	#define minimum_console_loglevel (console_printk[2])
	68	#define default_console_loglevel (console_printk[3])
	69
	70	struct completion;
df2e71fb AM	71	struct pt_regs;
df2e71fb AM	72	struct user;
1da177e4 LT	73
	74	/**
	75	* might_sleep - annotation for functions that can sleep
	76	*
	77	* this macro will print a stack trace if it is executed in an atomic
	78	* context (spinlock, irq-handler, ...).
	79	*
	80	* This is a useful debugging help to be able to catch problems early and not
e20ec991	81	* be bitten later when the calling function happens to sleep when it is not
1da177e4 LT	82	* supposed to.
1da177e4 LT	83	*/
f8cbd99b IM	84	#ifdef CONFIG_PREEMPT_VOLUNTARY
	85	extern int cond_resched(void);
	86	# define might_resched() cond_resched()
	87	#else
	88	# define might_resched() do { } while (0)
	89	#endif
	90
1da177e4	91	#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
f8cbd99b IM	92	void __might_sleep(char *file, int line);
	93	# define might_sleep() \
	94	do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
1da177e4	95	#else
f8cbd99b	96	# define might_sleep() do { might_resched(); } while (0)
1da177e4 LT	97	#endif
1da177e4 LT	98
368a5fa1	99	#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
f8cbd99b	100
1da177e4 LT	101	#define abs(x) ({ \
	102	int __x = (x); \
	103	(__x < 0) ? -__x : __x; \
	104	})
	105
e041c683	106	extern struct atomic_notifier_head panic_notifier_list;
1da177e4 LT	107	extern long (*panic_blink)(long time);
	108	NORET_TYPE void panic(const char * fmt, ...)
	109	__attribute__ ((NORET_AND format (printf, 1, 2)));
dd287796 AM	110	extern void oops_enter(void);
	111	extern void oops_exit(void);
	112	extern int oops_may_print(void);
1da177e4 LT	113	fastcall NORET_TYPE void do_exit(long error_code)
	114	ATTRIB_NORET;
	115	NORET_TYPE void complete_and_exit(struct completion *, long)
	116	ATTRIB_NORET;
	117	extern unsigned long simple_strtoul(const char ,char *,unsigned int);
	118	extern long simple_strtol(const char ,char *,unsigned int);
	119	extern unsigned long long simple_strtoull(const char ,char *,unsigned int);
	120	extern long long simple_strtoll(const char ,char *,unsigned int);
	121	extern int sprintf(char * buf, const char * fmt, ...)
	122	__attribute__ ((format (printf, 2, 3)));
	123	extern int vsprintf(char buf, const char , va_list)
	124	__attribute__ ((format (printf, 2, 0)));
	125	extern int snprintf(char * buf, size_t size, const char * fmt, ...)
	126	__attribute__ ((format (printf, 3, 4)));
	127	extern int vsnprintf(char buf, size_t size, const char fmt, va_list args)
	128	__attribute__ ((format (printf, 3, 0)));
	129	extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
	130	__attribute__ ((format (printf, 3, 4)));
	131	extern int vscnprintf(char buf, size_t size, const char fmt, va_list args)
	132	__attribute__ ((format (printf, 3, 0)));
e905914f JF	133	extern char kasprintf(gfp_t gfp, const char fmt, ...)
e905914f JF	134	__attribute__ ((format (printf, 2, 3)));
11443ec7	135	extern char kvasprintf(gfp_t gfp, const char fmt, va_list args);
1da177e4 LT	136
	137	extern int sscanf(const char , const char , ...)
	138	__attribute__ ((format (scanf, 2, 3)));
	139	extern int vsscanf(const char , const char , va_list)
	140	__attribute__ ((format (scanf, 2, 0)));
	141
	142	extern int get_option(char *str, int pint);
	143	extern char get_options(const char str, int nints, int *ints);
	144	extern unsigned long long memparse(char ptr, char *retptr);
	145
5e376613	146	extern int core_kernel_text(unsigned long addr);
1da177e4 LT	147	extern int __kernel_text_address(unsigned long addr);
1da177e4 LT	148	extern int kernel_text_address(unsigned long addr);
04a2e6a5 EB	149	struct pid;
04a2e6a5 EB	150	extern struct pid session_of_pgrp(struct pid pgrp);
1da177e4	151
df2e71fb AM	152	extern void dump_thread(struct pt_regs regs, struct user dump);
df2e71fb AM	153
d59745ce	154	#ifdef CONFIG_PRINTK
1da177e4 LT	155	asmlinkage int vprintk(const char *fmt, va_list args)
	156	__attribute__ ((format (printf, 1, 0)));
	157	asmlinkage int printk(const char * fmt, ...)
	158	__attribute__ ((format (printf, 1, 2)));
d59745ce MM	159	#else
	160	static inline int vprintk(const char *s, va_list args)
	161	__attribute__ ((format (printf, 1, 0)));
	162	static inline int vprintk(const char *s, va_list args) { return 0; }
	163	static inline int printk(const char *s, ...)
	164	__attribute__ ((format (printf, 1, 2)));
	165	static inline int printk(const char *s, ...) { return 0; }
	166	#endif
1da177e4 LT	167
	168	unsigned long int_sqrt(unsigned long);
	169
1da177e4 LT	170	extern int printk_ratelimit(void);
1da177e4 LT	171	extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
f46c4833 AM	172	extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
f46c4833 AM	173	unsigned int interval_msec);
1da177e4 LT	174
	175	static inline void console_silent(void)
	176	{
	177	console_loglevel = 0;
	178	}
	179
	180	static inline void console_verbose(void)
	181	{
	182	if (console_loglevel)
	183	console_loglevel = 15;
	184	}
	185
	186	extern void bust_spinlocks(int yes);
e3e8a75d	187	extern void wake_up_klogd(void);
1da177e4	188	extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
aa727107	189	extern int panic_timeout;
1da177e4	190	extern int panic_on_oops;
8da5adda	191	extern int panic_on_unrecovered_nmi;
1da177e4 LT	192	extern int tainted;
	193	extern const char *print_tainted(void);
	194	extern void add_taint(unsigned);
	195
	196	/* Values used for system_state */
	197	extern enum system_states {
	198	SYSTEM_BOOTING,
	199	SYSTEM_RUNNING,
	200	SYSTEM_HALT,
	201	SYSTEM_POWER_OFF,
	202	SYSTEM_RESTART,
729b4d4c	203	SYSTEM_SUSPEND_DISK,
1da177e4 LT	204	} system_state;
	205
	206	#define TAINT_PROPRIETARY_MODULE (1<<0)
	207	#define TAINT_FORCED_MODULE (1<<1)
	208	#define TAINT_UNSAFE_SMP (1<<2)
	209	#define TAINT_FORCED_RMMOD (1<<3)
	210	#define TAINT_MACHINE_CHECK (1<<4)
	211	#define TAINT_BAD_PAGE (1<<5)
34f5a398	212	#define TAINT_USER (1<<6)
1da177e4 LT	213
	214	extern void dump_stack(void);
	215
99eaf3c4 RD	216	enum {
	217	DUMP_PREFIX_NONE,
	218	DUMP_PREFIX_ADDRESS,
	219	DUMP_PREFIX_OFFSET
	220	};
	221	extern void hex_dump_to_buffer(const void buf, size_t len, char linebuf,
	222	size_t linebuflen);
	223	extern void print_hex_dump(const char *level, int prefix_type,
	224	void *buf, size_t len);
	225	#define hex_asc(x) "0123456789abcdef"[x]
	226
1da177e4	227	#ifdef DEBUG
1cc6daf2	228	/* If you are writing a driver, please use dev_dbg instead */
1da177e4 LT	229	#define pr_debug(fmt,arg...) \
	230	printk(KERN_DEBUG fmt,##arg)
	231	#else
8b2a1fd1 ZB	232	static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
	233	{
	234	return 0;
	235	}
1da177e4 LT	236	#endif
	237
	238	#define pr_info(fmt,arg...) \
	239	printk(KERN_INFO fmt,##arg)
	240
	241	/*
	242	* Display an IP address in readable format.
	243	*/
	244
	245	#define NIPQUAD(addr) \
	246	((unsigned char *)&addr)[0], \
	247	((unsigned char *)&addr)[1], \
	248	((unsigned char *)&addr)[2], \
	249	((unsigned char *)&addr)[3]
46b86a2d	250	#define NIPQUAD_FMT "%u.%u.%u.%u"
1da177e4 LT	251
	252	#define NIP6(addr) \
	253	ntohs((addr).s6_addr16[0]), \
	254	ntohs((addr).s6_addr16[1]), \
	255	ntohs((addr).s6_addr16[2]), \
	256	ntohs((addr).s6_addr16[3]), \
	257	ntohs((addr).s6_addr16[4]), \
	258	ntohs((addr).s6_addr16[5]), \
	259	ntohs((addr).s6_addr16[6]), \
	260	ntohs((addr).s6_addr16[7])
46b86a2d	261	#define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
9343e79a	262	#define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
1da177e4 LT	263
	264	#if defined(__LITTLE_ENDIAN)
	265	#define HIPQUAD(addr) \
	266	((unsigned char *)&addr)[3], \
	267	((unsigned char *)&addr)[2], \
	268	((unsigned char *)&addr)[1], \
	269	((unsigned char *)&addr)[0]
	270	#elif defined(__BIG_ENDIAN)
	271	#define HIPQUAD NIPQUAD
	272	#else
	273	#error "Please fix asm/byteorder.h"
	274	#endif /* __LITTLE_ENDIAN */
	275
	276	/*
	277	* min()/max() macros that also do
	278	* strict type-checking.. See the
	279	* "unnecessary" pointer comparison.
	280	*/
	281	#define min(x,y) ({ \
	282	typeof(x) _x = (x); \
	283	typeof(y) _y = (y); \
	284	(void) (&_x == &_y); \
	285	_x < _y ? _x : _y; })
	286
	287	#define max(x,y) ({ \
	288	typeof(x) _x = (x); \
	289	typeof(y) _y = (y); \
	290	(void) (&_x == &_y); \
	291	_x > _y ? _x : _y; })
	292
	293	/*
	294	* ..and if you can't take the strict
	295	* types, you can specify one yourself.
	296	*
	297	* Or not use min/max at all, of course.
	298	*/
	299	#define min_t(type,x,y) \
	300	({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
	301	#define max_t(type,x,y) \
	302	({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
	303
	304
	305	/**
	306	* container_of - cast a member of a structure out to the containing structure
1da177e4 LT	307	* @ptr: the pointer to the member.
	308	* @type: the type of the container struct this is embedded in.
	309	* @member: the name of the member within the struct.
	310	*
	311	*/
	312	#define container_of(ptr, type, member) ({ \
	313	const typeof( ((type )0)->member ) __mptr = (ptr); \
	314	(type )( (char )__mptr - offsetof(type,member) );})
	315
	316	/*
	317	* Check at compile time that something is of a particular type.
	318	* Always evaluates to 1 so you may use it easily in comparisons.
	319	*/
	320	#define typecheck(type,x) \
	321	({ type __dummy; \
	322	typeof(x) __dummy2; \
	323	(void)(&__dummy == &__dummy2); \
	324	1; \
	325	})
	326
711a660d CE	327	/*
	328	* Check at compile time that 'function' is a certain type, or is a pointer
	329	* to that type (needs to use typedef for the function type.)
	330	*/
	331	#define typecheck_fn(type,function) \
	332	({ typeof(type) __tmp = function; \
	333	(void)__tmp; \
	334	})
	335
d4d23add KM	336	struct sysinfo;
	337	extern int do_sysinfo(struct sysinfo *info);
	338
1da177e4 LT	339	#endif /* __KERNEL__ */
	340
	341	#define SI_LOAD_SHIFT 16
	342	struct sysinfo {
	343	long uptime; /* Seconds since boot */
	344	unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
	345	unsigned long totalram; /* Total usable main memory size */
	346	unsigned long freeram; /* Available memory size */
	347	unsigned long sharedram; /* Amount of shared memory */
	348	unsigned long bufferram; /* Memory used by buffers */
	349	unsigned long totalswap; /* Total swap space size */
	350	unsigned long freeswap; /* swap space still available */
	351	unsigned short procs; /* Number of current processes */
	352	unsigned short pad; /* explicit padding for m68k */
	353	unsigned long totalhigh; /* Total high memory size */
	354	unsigned long freehigh; /* Available high memory size */
	355	unsigned int mem_unit; /* Memory unit size in bytes */
	356	char _f[20-2sizeof(long)-sizeof(int)]; / Padding: libc5 uses this.. */
	357	};
	358
c0398ee6	359	/* Force a compilation error if condition is true */
921717a2	360	#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
1da177e4	361
4552d5dc JB	362	/* Force a compilation error if condition is true, but also produce a
	363	result (of value 0 and type size_t), so the expression can be used
	364	e.g. in a structure initializer (or where-ever else comma expressions
	365	aren't permitted). */
	366	#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
	367
1da177e4	368	/* Trap pasters of __FUNCTION__ at compile-time */
1da177e4	369	#define __FUNCTION__ (__func__)
1da177e4	370
08e0f6a9 CL	371	/* This helps us to avoid #ifdef CONFIG_NUMA */
	372	#ifdef CONFIG_NUMA
	373	#define NUMA_BUILD 1
	374	#else
	375	#define NUMA_BUILD 0
	376	#endif
	377
1da177e4	378	#endif