[mirror_ubuntu-hirsute-kernel.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 <asm/byteorder.h>
#include <asm/bug.h>

extern const char linux_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 ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
#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))

#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 biten 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;		\
	})

#define labs(x) ({				\
		long __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 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);
extern int session_of_pgrp(int 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);

static inline int __attribute_pure__ long_log2(unsigned long x)
{
	int r = 0;
	for (x >>= 1; x > 0; x >>= 1)
		r++;
	return r;
}

static inline unsigned long
__attribute_const__ roundup_pow_of_two(unsigned long x)
{
	return 1UL << fls_long(x - 1);
}

extern int printk_ratelimit(void);
extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);

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 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)

extern void dump_stack(void);

#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; \
})

#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>
	16	#include <asm/byteorder.h>
	17	#include <asm/bug.h>
	18
	19	extern const char linux_banner[];
	20
	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)
111ebb6e OH	27	#define LLONG_MAX ((long long)(~0ULL>>1))
	28	#define LLONG_MIN (-LLONG_MAX - 1)
	29	#define ULLONG_MAX (~0ULL)
1da177e4 LT	30
	31	#define STACK_MAGIC 0xdeadbeef
	32
	33	#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
4c8bd7ee	34	#define ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
4552d5dc	35	#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
930631ed	36	#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
b4cac1a0	37	#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
1da177e4 LT	38
	39	#define KERN_EMERG "<0>" /* system is unusable */
	40	#define KERN_ALERT "<1>" /* action must be taken immediately */
	41	#define KERN_CRIT "<2>" /* critical conditions */
	42	#define KERN_ERR "<3>" /* error conditions */
	43	#define KERN_WARNING "<4>" /* warning conditions */
	44	#define KERN_NOTICE "<5>" /* normal but significant condition */
	45	#define KERN_INFO "<6>" /* informational */
	46	#define KERN_DEBUG "<7>" /* debug-level messages */
	47
	48	extern int console_printk[];
	49
	50	#define console_loglevel (console_printk[0])
	51	#define default_message_loglevel (console_printk[1])
	52	#define minimum_console_loglevel (console_printk[2])
	53	#define default_console_loglevel (console_printk[3])
	54
	55	struct completion;
df2e71fb	56	struct pt_regs;
df2e71fb	57	struct user;
1da177e4 LT	58
	59	/**
	60	* might_sleep - annotation for functions that can sleep
	61	*
	62	* this macro will print a stack trace if it is executed in an atomic
	63	* context (spinlock, irq-handler, ...).
	64	*
	65	* This is a useful debugging help to be able to catch problems early and not
	66	* be biten later when the calling function happens to sleep when it is not
	67	* supposed to.
	68	*/
f8cbd99b IM	69	#ifdef CONFIG_PREEMPT_VOLUNTARY
	70	extern int cond_resched(void);
	71	# define might_resched() cond_resched()
	72	#else
	73	# define might_resched() do { } while (0)
	74	#endif
	75
1da177e4	76	#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
f8cbd99b IM	77	void __might_sleep(char *file, int line);
	78	# define might_sleep() \
	79	do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
1da177e4	80	#else
f8cbd99b	81	# define might_sleep() do { might_resched(); } while (0)
1da177e4 LT	82	#endif
1da177e4 LT	83
368a5fa1	84	#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
f8cbd99b	85
1da177e4 LT	86	#define abs(x) ({ \
	87	int __x = (x); \
	88	(__x < 0) ? -__x : __x; \
	89	})
	90
	91	#define labs(x) ({ \
	92	long __x = (x); \
	93	(__x < 0) ? -__x : __x; \
	94	})
	95
e041c683	96	extern struct atomic_notifier_head panic_notifier_list;
1da177e4 LT	97	extern long (*panic_blink)(long time);
	98	NORET_TYPE void panic(const char * fmt, ...)
	99	__attribute__ ((NORET_AND format (printf, 1, 2)));
dd287796 AM	100	extern void oops_enter(void);
	101	extern void oops_exit(void);
	102	extern int oops_may_print(void);
1da177e4 LT	103	fastcall NORET_TYPE void do_exit(long error_code)
	104	ATTRIB_NORET;
	105	NORET_TYPE void complete_and_exit(struct completion *, long)
	106	ATTRIB_NORET;
	107	extern unsigned long simple_strtoul(const char ,char *,unsigned int);
	108	extern long simple_strtol(const char ,char *,unsigned int);
	109	extern unsigned long long simple_strtoull(const char ,char *,unsigned int);
	110	extern long long simple_strtoll(const char ,char *,unsigned int);
	111	extern int sprintf(char * buf, const char * fmt, ...)
	112	__attribute__ ((format (printf, 2, 3)));
	113	extern int vsprintf(char buf, const char , va_list)
	114	__attribute__ ((format (printf, 2, 0)));
	115	extern int snprintf(char * buf, size_t size, const char * fmt, ...)
	116	__attribute__ ((format (printf, 3, 4)));
	117	extern int vsnprintf(char buf, size_t size, const char fmt, va_list args)
	118	__attribute__ ((format (printf, 3, 0)));
	119	extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
	120	__attribute__ ((format (printf, 3, 4)));
	121	extern int vscnprintf(char buf, size_t size, const char fmt, va_list args)
	122	__attribute__ ((format (printf, 3, 0)));
e905914f JF	123	extern char kasprintf(gfp_t gfp, const char fmt, ...)
e905914f JF	124	__attribute__ ((format (printf, 2, 3)));
1da177e4 LT	125
	126	extern int sscanf(const char , const char , ...)
	127	__attribute__ ((format (scanf, 2, 3)));
	128	extern int vsscanf(const char , const char , va_list)
	129	__attribute__ ((format (scanf, 2, 0)));
	130
	131	extern int get_option(char *str, int pint);
	132	extern char get_options(const char str, int nints, int *ints);
	133	extern unsigned long long memparse(char ptr, char *retptr);
	134
5e376613	135	extern int core_kernel_text(unsigned long addr);
1da177e4 LT	136	extern int __kernel_text_address(unsigned long addr);
	137	extern int kernel_text_address(unsigned long addr);
	138	extern int session_of_pgrp(int pgrp);
	139
df2e71fb	140	extern void dump_thread(struct pt_regs regs, struct user dump);
df2e71fb	141
d59745ce	142	#ifdef CONFIG_PRINTK
1da177e4 LT	143	asmlinkage int vprintk(const char *fmt, va_list args)
	144	__attribute__ ((format (printf, 1, 0)));
	145	asmlinkage int printk(const char * fmt, ...)
	146	__attribute__ ((format (printf, 1, 2)));
d59745ce MM	147	#else
	148	static inline int vprintk(const char *s, va_list args)
	149	__attribute__ ((format (printf, 1, 0)));
	150	static inline int vprintk(const char *s, va_list args) { return 0; }
	151	static inline int printk(const char *s, ...)
	152	__attribute__ ((format (printf, 1, 2)));
	153	static inline int printk(const char *s, ...) { return 0; }
	154	#endif
1da177e4 LT	155
	156	unsigned long int_sqrt(unsigned long);
	157
	158	static inline int __attribute_pure__ long_log2(unsigned long x)
	159	{
	160	int r = 0;
	161	for (x >>= 1; x > 0; x >>= 1)
	162	r++;
	163	return r;
	164	}
	165
962749af AM	166	static inline unsigned long
962749af AM	167	__attribute_const__ roundup_pow_of_two(unsigned long x)
1da177e4	168	{
962749af	169	return 1UL << fls_long(x - 1);
1da177e4 LT	170	}
	171
	172	extern int printk_ratelimit(void);
	173	extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
	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);
	187	extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
aa727107	188	extern int panic_timeout;
1da177e4	189	extern int panic_on_oops;
8da5adda	190	extern int panic_on_unrecovered_nmi;
1da177e4 LT	191	extern int tainted;
	192	extern const char *print_tainted(void);
	193	extern void add_taint(unsigned);
	194
	195	/* Values used for system_state */
	196	extern enum system_states {
	197	SYSTEM_BOOTING,
	198	SYSTEM_RUNNING,
	199	SYSTEM_HALT,
	200	SYSTEM_POWER_OFF,
	201	SYSTEM_RESTART,
729b4d4c	202	SYSTEM_SUSPEND_DISK,
1da177e4 LT	203	} system_state;
	204
	205	#define TAINT_PROPRIETARY_MODULE (1<<0)
	206	#define TAINT_FORCED_MODULE (1<<1)
	207	#define TAINT_UNSAFE_SMP (1<<2)
	208	#define TAINT_FORCED_RMMOD (1<<3)
	209	#define TAINT_MACHINE_CHECK (1<<4)
	210	#define TAINT_BAD_PAGE (1<<5)
	211
	212	extern void dump_stack(void);
	213
	214	#ifdef DEBUG
1cc6daf2	215	/* If you are writing a driver, please use dev_dbg instead */
1da177e4 LT	216	#define pr_debug(fmt,arg...) \
	217	printk(KERN_DEBUG fmt,##arg)
	218	#else
8b2a1fd1 ZB	219	static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
	220	{
	221	return 0;
	222	}
1da177e4 LT	223	#endif
	224
	225	#define pr_info(fmt,arg...) \
	226	printk(KERN_INFO fmt,##arg)
	227
	228	/*
	229	* Display an IP address in readable format.
	230	*/
	231
	232	#define NIPQUAD(addr) \
	233	((unsigned char *)&addr)[0], \
	234	((unsigned char *)&addr)[1], \
	235	((unsigned char *)&addr)[2], \
	236	((unsigned char *)&addr)[3]
46b86a2d	237	#define NIPQUAD_FMT "%u.%u.%u.%u"
1da177e4 LT	238
	239	#define NIP6(addr) \
	240	ntohs((addr).s6_addr16[0]), \
	241	ntohs((addr).s6_addr16[1]), \
	242	ntohs((addr).s6_addr16[2]), \
	243	ntohs((addr).s6_addr16[3]), \
	244	ntohs((addr).s6_addr16[4]), \
	245	ntohs((addr).s6_addr16[5]), \
	246	ntohs((addr).s6_addr16[6]), \
	247	ntohs((addr).s6_addr16[7])
46b86a2d	248	#define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
9343e79a	249	#define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
1da177e4 LT	250
	251	#if defined(__LITTLE_ENDIAN)
	252	#define HIPQUAD(addr) \
	253	((unsigned char *)&addr)[3], \
	254	((unsigned char *)&addr)[2], \
	255	((unsigned char *)&addr)[1], \
	256	((unsigned char *)&addr)[0]
	257	#elif defined(__BIG_ENDIAN)
	258	#define HIPQUAD NIPQUAD
	259	#else
	260	#error "Please fix asm/byteorder.h"
	261	#endif /* __LITTLE_ENDIAN */
	262
	263	/*
	264	* min()/max() macros that also do
	265	* strict type-checking.. See the
	266	* "unnecessary" pointer comparison.
	267	*/
	268	#define min(x,y) ({ \
	269	typeof(x) _x = (x); \
	270	typeof(y) _y = (y); \
	271	(void) (&_x == &_y); \
	272	_x < _y ? _x : _y; })
	273
	274	#define max(x,y) ({ \
	275	typeof(x) _x = (x); \
	276	typeof(y) _y = (y); \
	277	(void) (&_x == &_y); \
	278	_x > _y ? _x : _y; })
	279
	280	/*
	281	* ..and if you can't take the strict
	282	* types, you can specify one yourself.
	283	*
	284	* Or not use min/max at all, of course.
	285	*/
	286	#define min_t(type,x,y) \
	287	({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
	288	#define max_t(type,x,y) \
	289	({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
	290
	291
	292	/**
	293	* container_of - cast a member of a structure out to the containing structure
1da177e4 LT	294	* @ptr: the pointer to the member.
	295	* @type: the type of the container struct this is embedded in.
	296	* @member: the name of the member within the struct.
	297	*
	298	*/
	299	#define container_of(ptr, type, member) ({ \
	300	const typeof( ((type )0)->member ) __mptr = (ptr); \
	301	(type )( (char )__mptr - offsetof(type,member) );})
	302
	303	/*
	304	* Check at compile time that something is of a particular type.
	305	* Always evaluates to 1 so you may use it easily in comparisons.
	306	*/
	307	#define typecheck(type,x) \
	308	({ type __dummy; \
	309	typeof(x) __dummy2; \
	310	(void)(&__dummy == &__dummy2); \
	311	1; \
	312	})
	313
711a660d CE	314	/*
	315	* Check at compile time that 'function' is a certain type, or is a pointer
	316	* to that type (needs to use typedef for the function type.)
	317	*/
	318	#define typecheck_fn(type,function) \
	319	({ typeof(type) __tmp = function; \
	320	(void)__tmp; \
	321	})
	322
1da177e4 LT	323	#endif /* __KERNEL__ */
	324
	325	#define SI_LOAD_SHIFT 16
	326	struct sysinfo {
	327	long uptime; /* Seconds since boot */
	328	unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
	329	unsigned long totalram; /* Total usable main memory size */
	330	unsigned long freeram; /* Available memory size */
	331	unsigned long sharedram; /* Amount of shared memory */
	332	unsigned long bufferram; /* Memory used by buffers */
	333	unsigned long totalswap; /* Total swap space size */
	334	unsigned long freeswap; /* swap space still available */
	335	unsigned short procs; /* Number of current processes */
	336	unsigned short pad; /* explicit padding for m68k */
	337	unsigned long totalhigh; /* Total high memory size */
	338	unsigned long freehigh; /* Available high memory size */
	339	unsigned int mem_unit; /* Memory unit size in bytes */
	340	char _f[20-2sizeof(long)-sizeof(int)]; / Padding: libc5 uses this.. */
	341	};
	342
c0398ee6	343	/* Force a compilation error if condition is true */
921717a2	344	#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
1da177e4	345
4552d5dc JB	346	/* Force a compilation error if condition is true, but also produce a
	347	result (of value 0 and type size_t), so the expression can be used
	348	e.g. in a structure initializer (or where-ever else comma expressions
	349	aren't permitted). */
	350	#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
	351
1da177e4	352	/* Trap pasters of __FUNCTION__ at compile-time */
1da177e4	353	#define __FUNCTION__ (__func__)
1da177e4	354
08e0f6a9 CL	355	/* This helps us to avoid #ifdef CONFIG_NUMA */
	356	#ifdef CONFIG_NUMA
	357	#define NUMA_BUILD 1
	358	#else
	359	#define NUMA_BUILD 0
	360	#endif
	361
1da177e4	362	#endif