[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 <linux/typecheck.h>
#include <linux/ratelimit.h>
#include <linux/dynamic_printk.h>
#include <asm/byteorder.h>
#include <asm/bug.h>

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

#define USHORT_MAX	((u16)(~0U))
#define SHORT_MAX	((s16)(USHORT_MAX>>1))
#define SHORT_MIN	(-SHORT_MAX - 1)
#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 PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
#define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)

#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))

#define _RET_IP_		(unsigned long)__builtin_return_address(0)
#define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })

#ifdef CONFIG_LBD
# include <asm/div64.h>
# define sector_div(a, b) do_div(a, b)
#else
# define sector_div(n, b)( \
{ \
	int _res; \
	_res = (n) % (b); \
	(n) /= (b); \
	_res; \
} \
)
#endif

/**
 * 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))

/**
 * lower_32_bits - return bits 0-31 of a number
 * @n: the number we're accessing
 */
#define lower_32_bits(n) ((u32)(n))

#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			*/

/*
 * Annotation for a "continued" line of log printout (only done after a
 * line that had no enclosing \n). Only to be used by core/arch code
 * during early bootup (a continued line is not SMP-safe otherwise).
 */
#define	KERN_CONT	""

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;

#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);
/**
 * 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.
 */
# 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;		\
	})

#ifdef CONFIG_PROVE_LOCKING
void might_fault(void);
#else
static inline void might_fault(void)
{
	might_sleep();
}
#endif

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))) __cold;
extern void oops_enter(void);
extern void oops_exit(void);
extern int oops_may_print(void);
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 strict_strtoul(const char *, unsigned int, unsigned long *);
extern int strict_strtol(const char *, unsigned int, long *);
extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
extern int strict_strtoll(const char *, unsigned int, long long *);
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(const 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 func_ptr_is_kernel_text(void *ptr);

struct pid;
extern struct pid *session_of_pgrp(struct pid *pgrp);

/*
 * FW_BUG
 * Add this to a message where you are sure the firmware is buggy or behaves
 * really stupid or out of spec. Be aware that the responsible BIOS developer
 * should be able to fix this issue or at least get a concrete idea of the
 * problem by reading your message without the need of looking at the kernel
 * code.
 * 
 * Use it for definite and high priority BIOS bugs.
 *
 * FW_WARN
 * Use it for not that clear (e.g. could the kernel messed up things already?)
 * and medium priority BIOS bugs.
 *
 * FW_INFO
 * Use this one if you want to tell the user or vendor about something
 * suspicious, but generally harmless related to the firmware.
 *
 * Use it for information or very low priority BIOS bugs.
 */
#define FW_BUG		"[Firmware Bug]: "
#define FW_WARN		"[Firmware Warn]: "
#define FW_INFO		"[Firmware Info]: "

#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))) __cold;

extern struct ratelimit_state printk_ratelimit_state;
extern int printk_ratelimit(void);
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
				   unsigned int interval_msec);
#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 __cold printk(const char *s, ...) { return 0; }
static inline int printk_ratelimit(void) { return 0; }
static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
					  unsigned int interval_msec)	\
		{ return false; }
#endif

extern int printk_needs_cpu(int cpu);
extern void printk_tick(void);

extern void asmlinkage __attribute__((format(printf, 1, 2)))
	early_printk(const char *fmt, ...);

unsigned long int_sqrt(unsigned long);

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 const char *print_tainted(void);
extern void add_taint(unsigned flag);
extern int test_taint(unsigned flag);
extern unsigned long get_taint(void);
extern int root_mountflags;

/* 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	0
#define TAINT_FORCED_MODULE		1
#define TAINT_UNSAFE_SMP		2
#define TAINT_FORCED_RMMOD		3
#define TAINT_MACHINE_CHECK		4
#define TAINT_BAD_PAGE			5
#define TAINT_USER			6
#define TAINT_DIE			7
#define TAINT_OVERRIDDEN_ACPI_TABLE	8
#define TAINT_WARN			9
#define TAINT_CRAP			10

extern void dump_stack(void) __cold;

enum {
	DUMP_PREFIX_NONE,
	DUMP_PREFIX_ADDRESS,
	DUMP_PREFIX_OFFSET
};
extern void hex_dump_to_buffer(const void *buf, size_t len,
				int rowsize, int groupsize,
				char *linebuf, size_t linebuflen, bool ascii);
extern void print_hex_dump(const char *level, const char *prefix_str,
				int prefix_type, int rowsize, int groupsize,
				const void *buf, size_t len, bool ascii);
extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
			const void *buf, size_t len);

extern const char hex_asc[];
#define hex_asc_lo(x)	hex_asc[((x) & 0x0f)]
#define hex_asc_hi(x)	hex_asc[((x) & 0xf0) >> 4]

static inline char *pack_hex_byte(char *buf, u8 byte)
{
	*buf++ = hex_asc_hi(byte);
	*buf++ = hex_asc_lo(byte);
	return buf;
}

#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif

#define pr_emerg(fmt, ...) \
        printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
#define pr_alert(fmt, ...) \
        printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
#define pr_crit(fmt, ...) \
        printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
#define pr_err(fmt, ...) \
        printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warning(fmt, ...) \
        printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
#define pr_notice(fmt, ...) \
        printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
#define pr_info(fmt, ...) \
        printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)

/* If you are writing a driver, please use dev_dbg instead */
#if defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
#define pr_debug(fmt, ...) do { \
	dynamic_pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
	} while (0)
#elif defined(DEBUG)
#define pr_debug(fmt, ...) \
	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#else
#define pr_debug(fmt, ...) \
	({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
#endif

/*
 *      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"

#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()/clamp() macros that also do
 * strict type-checking.. See the
 * "unnecessary" pointer comparison.
 */
#define min(x, y) ({				\
	typeof(x) _min1 = (x);			\
	typeof(y) _min2 = (y);			\
	(void) (&_min1 == &_min2);		\
	_min1 < _min2 ? _min1 : _min2; })

#define max(x, y) ({				\
	typeof(x) _max1 = (x);			\
	typeof(y) _max2 = (y);			\
	(void) (&_max1 == &_max2);		\
	_max1 > _max2 ? _max1 : _max2; })

/**
 * clamp - return a value clamped to a given range with strict typechecking
 * @val: current value
 * @min: minimum allowable value
 * @max: maximum allowable value
 *
 * This macro does strict typechecking of min/max to make sure they are of the
 * same type as val.  See the unnecessary pointer comparisons.
 */
#define clamp(val, min, max) ({			\
	typeof(val) __val = (val);		\
	typeof(min) __min = (min);		\
	typeof(max) __max = (max);		\
	(void) (&__val == &__min);		\
	(void) (&__val == &__max);		\
	__val = __val < __min ? __min: __val;	\
	__val > __max ? __max: __val; })

/*
 * ..and if you can't take the strict
 * types, you can specify one yourself.
 *
 * Or not use min/max/clamp at all, of course.
 */
#define min_t(type, x, y) ({			\
	type __min1 = (x);			\
	type __min2 = (y);			\
	__min1 < __min2 ? __min1: __min2; })

#define max_t(type, x, y) ({			\
	type __max1 = (x);			\
	type __max2 = (y);			\
	__max1 > __max2 ? __max1: __max2; })

/**
 * clamp_t - return a value clamped to a given range using a given type
 * @type: the type of variable to use
 * @val: current value
 * @min: minimum allowable value
 * @max: maximum allowable value
 *
 * This macro does no typechecking and uses temporary variables of type
 * 'type' to make all the comparisons.
 */
#define clamp_t(type, val, min, max) ({		\
	type __val = (val);			\
	type __min = (min);			\
	type __max = (max);			\
	__val = __val < __min ? __min: __val;	\
	__val > __max ? __max: __val; })

/**
 * clamp_val - return a value clamped to a given range using val's type
 * @val: current value
 * @min: minimum allowable value
 * @max: maximum allowable value
 *
 * This macro does no typechecking and uses temporary variables of whatever
 * type the input argument 'val' is.  This is useful when val is an unsigned
 * type and min and max are literals that will otherwise be assigned a signed
 * integer type.
 */
#define clamp_val(val, min, max) ({		\
	typeof(val) __val = (val);		\
	typeof(val) __min = (min);		\
	typeof(val) __max = (max);		\
	__val = __val < __min ? __min: __val;	\
	__val > __max ? __max: __val; })

/**
 * 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) );})

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

/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
#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>
e0deaff4	17	#include <linux/typecheck.h>
717115e1	18	#include <linux/ratelimit.h>
346e15be	19	#include <linux/dynamic_printk.h>
1da177e4 LT	20	#include <asm/byteorder.h>
	21	#include <asm/bug.h>
	22
3eb3c740 RZ	23	extern const char linux_banner[];
	24	extern const char linux_proc_banner[];
	25
44f564a4 ZY	26	#define USHORT_MAX ((u16)(~0U))
	27	#define SHORT_MAX ((s16)(USHORT_MAX>>1))
	28	#define SHORT_MIN (-SHORT_MAX - 1)
1da177e4 LT	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)
111ebb6e OH	35	#define LLONG_MAX ((long long)(~0ULL>>1))
	36	#define LLONG_MIN (-LLONG_MAX - 1)
	37	#define ULLONG_MAX (~0ULL)
1da177e4 LT	38
	39	#define STACK_MAGIC 0xdeadbeef
	40
2ea58144 LT	41	#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
2ea58144 LT	42	#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
a83308e6	43	#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
f10db627	44	#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
2ea58144	45
c5e631cf RR	46	#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
c5e631cf RR	47
4552d5dc	48	#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
930631ed	49	#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
b4cac1a0	50	#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
1da177e4	51
ca31e146 EGM	52	#define _RET_IP_ (unsigned long)__builtin_return_address(0)
	53	#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
	54
2da96acd JA	55	#ifdef CONFIG_LBD
	56	# include <asm/div64.h>
	57	# define sector_div(a, b) do_div(a, b)
	58	#else
	59	# define sector_div(n, b)( \
	60	{ \
	61	int _res; \
	62	_res = (n) % (b); \
	63	(n) /= (b); \
	64	_res; \
	65	} \
	66	)
	67	#endif
	68
218e180e AM	69	/**
	70	* upper_32_bits - return bits 32-63 of a number
	71	* @n: the number we're accessing
	72	*
	73	* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
	74	* the "right shift count >= width of type" warning when that quantity is
	75	* 32-bits.
	76	*/
	77	#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
	78
204b885e JR	79	/**
	80	* lower_32_bits - return bits 0-31 of a number
	81	* @n: the number we're accessing
	82	*/
	83	#define lower_32_bits(n) ((u32)(n))
	84
1da177e4 LT	85	#define KERN_EMERG "<0>" /* system is unusable */
	86	#define KERN_ALERT "<1>" /* action must be taken immediately */
	87	#define KERN_CRIT "<2>" /* critical conditions */
	88	#define KERN_ERR "<3>" /* error conditions */
	89	#define KERN_WARNING "<4>" /* warning conditions */
	90	#define KERN_NOTICE "<5>" /* normal but significant condition */
	91	#define KERN_INFO "<6>" /* informational */
	92	#define KERN_DEBUG "<7>" /* debug-level messages */
	93
47492527 IM	94	/*
	95	* Annotation for a "continued" line of log printout (only done after a
	96	* line that had no enclosing \n). Only to be used by core/arch code
	97	* during early bootup (a continued line is not SMP-safe otherwise).
	98	*/
	99	#define KERN_CONT ""
	100
1da177e4 LT	101	extern int console_printk[];
	102
	103	#define console_loglevel (console_printk[0])
	104	#define default_message_loglevel (console_printk[1])
	105	#define minimum_console_loglevel (console_printk[2])
	106	#define default_console_loglevel (console_printk[3])
	107
	108	struct completion;
df2e71fb AM	109	struct pt_regs;
df2e71fb AM	110	struct user;
1da177e4	111
070cb065 UKK	112	#ifdef CONFIG_PREEMPT_VOLUNTARY
	113	extern int _cond_resched(void);
	114	# define might_resched() _cond_resched()
	115	#else
	116	# define might_resched() do { } while (0)
	117	#endif
	118
7106a27b RD	119	#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
7106a27b RD	120	void __might_sleep(char *file, int line);
1da177e4 LT	121	/**
	122	* might_sleep - annotation for functions that can sleep
	123	*
	124	* this macro will print a stack trace if it is executed in an atomic
	125	* context (spinlock, irq-handler, ...).
	126	*
	127	* This is a useful debugging help to be able to catch problems early and not
e20ec991	128	* be bitten later when the calling function happens to sleep when it is not
1da177e4 LT	129	* supposed to.
1da177e4 LT	130	*/
f8cbd99b IM	131	# define might_sleep() \
f8cbd99b IM	132	do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
1da177e4	133	#else
f8cbd99b	134	# define might_sleep() do { might_resched(); } while (0)
1da177e4 LT	135	#endif
1da177e4 LT	136
368a5fa1	137	#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
f8cbd99b	138
1da177e4 LT	139	#define abs(x) ({ \
	140	int __x = (x); \
	141	(__x < 0) ? -__x : __x; \
	142	})
	143
3ee1afa3 NP	144	#ifdef CONFIG_PROVE_LOCKING
	145	void might_fault(void);
	146	#else
	147	static inline void might_fault(void)
	148	{
	149	might_sleep();
	150	}
	151	#endif
	152
e041c683	153	extern struct atomic_notifier_head panic_notifier_list;
1da177e4 LT	154	extern long (*panic_blink)(long time);
1da177e4 LT	155	NORET_TYPE void panic(const char * fmt, ...)
a586df06	156	__attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
dd287796 AM	157	extern void oops_enter(void);
	158	extern void oops_exit(void);
	159	extern int oops_may_print(void);
ec701584	160	NORET_TYPE void do_exit(long error_code)
1da177e4 LT	161	ATTRIB_NORET;
	162	NORET_TYPE void complete_and_exit(struct completion *, long)
	163	ATTRIB_NORET;
	164	extern unsigned long simple_strtoul(const char ,char *,unsigned int);
	165	extern long simple_strtol(const char ,char *,unsigned int);
	166	extern unsigned long long simple_strtoull(const char ,char *,unsigned int);
	167	extern long long simple_strtoll(const char ,char *,unsigned int);
06b2a76d YY	168	extern int strict_strtoul(const char , unsigned int, unsigned long );
	169	extern int strict_strtol(const char , unsigned int, long );
	170	extern int strict_strtoull(const char , unsigned int, unsigned long long );
	171	extern int strict_strtoll(const char , unsigned int, long long );
1da177e4 LT	172	extern int sprintf(char * buf, const char * fmt, ...)
	173	__attribute__ ((format (printf, 2, 3)));
	174	extern int vsprintf(char buf, const char , va_list)
	175	__attribute__ ((format (printf, 2, 0)));
	176	extern int snprintf(char * buf, size_t size, const char * fmt, ...)
	177	__attribute__ ((format (printf, 3, 4)));
	178	extern int vsnprintf(char buf, size_t size, const char fmt, va_list args)
	179	__attribute__ ((format (printf, 3, 0)));
	180	extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
	181	__attribute__ ((format (printf, 3, 4)));
	182	extern int vscnprintf(char buf, size_t size, const char fmt, va_list args)
	183	__attribute__ ((format (printf, 3, 0)));
e905914f JF	184	extern char kasprintf(gfp_t gfp, const char fmt, ...)
e905914f JF	185	__attribute__ ((format (printf, 2, 3)));
11443ec7	186	extern char kvasprintf(gfp_t gfp, const char fmt, va_list args);
1da177e4 LT	187
	188	extern int sscanf(const char , const char , ...)
	189	__attribute__ ((format (scanf, 2, 3)));
	190	extern int vsscanf(const char , const char , va_list)
	191	__attribute__ ((format (scanf, 2, 0)));
	192
	193	extern int get_option(char *str, int pint);
	194	extern char get_options(const char str, int nints, int *ints);
d974ae37	195	extern unsigned long long memparse(const char ptr, char *retptr);
1da177e4	196
5e376613	197	extern int core_kernel_text(unsigned long addr);
1da177e4 LT	198	extern int __kernel_text_address(unsigned long addr);
1da177e4 LT	199	extern int kernel_text_address(unsigned long addr);
ab7476cf	200	extern int func_ptr_is_kernel_text(void *ptr);
ab7476cf	201
04a2e6a5 EB	202	struct pid;
04a2e6a5 EB	203	extern struct pid session_of_pgrp(struct pid pgrp);
1da177e4	204
a0ad05c7 TR	205	/*
	206	* FW_BUG
	207	* Add this to a message where you are sure the firmware is buggy or behaves
	208	* really stupid or out of spec. Be aware that the responsible BIOS developer
	209	* should be able to fix this issue or at least get a concrete idea of the
	210	* problem by reading your message without the need of looking at the kernel
	211	* code.
	212	*
	213	* Use it for definite and high priority BIOS bugs.
	214	*
	215	* FW_WARN
	216	* Use it for not that clear (e.g. could the kernel messed up things already?)
	217	* and medium priority BIOS bugs.
	218	*
	219	* FW_INFO
	220	* Use this one if you want to tell the user or vendor about something
	221	* suspicious, but generally harmless related to the firmware.
	222	*
	223	* Use it for information or very low priority BIOS bugs.
	224	*/
	225	#define FW_BUG "[Firmware Bug]: "
	226	#define FW_WARN "[Firmware Warn]: "
	227	#define FW_INFO "[Firmware Info]: "
	228
d59745ce	229	#ifdef CONFIG_PRINTK
1da177e4 LT	230	asmlinkage int vprintk(const char *fmt, va_list args)
	231	__attribute__ ((format (printf, 1, 0)));
	232	asmlinkage int printk(const char * fmt, ...)
a586df06	233	__attribute__ ((format (printf, 1, 2))) __cold;
7ef3d2fd	234
717115e1	235	extern struct ratelimit_state printk_ratelimit_state;
7ef3d2fd	236	extern int printk_ratelimit(void);
7ef3d2fd JP	237	extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
7ef3d2fd JP	238	unsigned int interval_msec);
d59745ce MM	239	#else
	240	static inline int vprintk(const char *s, va_list args)
	241	__attribute__ ((format (printf, 1, 0)));
	242	static inline int vprintk(const char *s, va_list args) { return 0; }
	243	static inline int printk(const char *s, ...)
	244	__attribute__ ((format (printf, 1, 2)));
a586df06	245	static inline int __cold printk(const char *s, ...) { return 0; }
7ef3d2fd	246	static inline int printk_ratelimit(void) { return 0; }
7ef3d2fd JP	247	static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
	248	unsigned int interval_msec) \
	249	{ return false; }
d59745ce	250	#endif
1da177e4	251
ced9cd40 IM	252	extern int printk_needs_cpu(int cpu);
	253	extern void printk_tick(void);
	254
e17ba73b	255	extern void asmlinkage __attribute__((format(printf, 1, 2)))
076f9776 IM	256	early_printk(const char *fmt, ...);
076f9776 IM	257
1da177e4 LT	258	unsigned long int_sqrt(unsigned long);
1da177e4 LT	259
1da177e4 LT	260	static inline void console_silent(void)
	261	{
	262	console_loglevel = 0;
	263	}
	264
	265	static inline void console_verbose(void)
	266	{
	267	if (console_loglevel)
	268	console_loglevel = 15;
	269	}
	270
	271	extern void bust_spinlocks(int yes);
e3e8a75d	272	extern void wake_up_klogd(void);
1da177e4	273	extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
aa727107	274	extern int panic_timeout;
1da177e4	275	extern int panic_on_oops;
8da5adda	276	extern int panic_on_unrecovered_nmi;
1da177e4	277	extern const char *print_tainted(void);
25ddbb18 AK	278	extern void add_taint(unsigned flag);
	279	extern int test_taint(unsigned flag);
	280	extern unsigned long get_taint(void);
b920de1b	281	extern int root_mountflags;
1da177e4 LT	282
	283	/* Values used for system_state */
	284	extern enum system_states {
	285	SYSTEM_BOOTING,
	286	SYSTEM_RUNNING,
	287	SYSTEM_HALT,
	288	SYSTEM_POWER_OFF,
	289	SYSTEM_RESTART,
729b4d4c	290	SYSTEM_SUSPEND_DISK,
1da177e4 LT	291	} system_state;
1da177e4 LT	292
25ddbb18 AK	293	#define TAINT_PROPRIETARY_MODULE 0
	294	#define TAINT_FORCED_MODULE 1
	295	#define TAINT_UNSAFE_SMP 2
	296	#define TAINT_FORCED_RMMOD 3
	297	#define TAINT_MACHINE_CHECK 4
	298	#define TAINT_BAD_PAGE 5
	299	#define TAINT_USER 6
	300	#define TAINT_DIE 7
	301	#define TAINT_OVERRIDDEN_ACPI_TABLE 8
	302	#define TAINT_WARN 9
26e9a397	303	#define TAINT_CRAP 10
1da177e4	304
a586df06	305	extern void dump_stack(void) __cold;
1da177e4	306
99eaf3c4 RD	307	enum {
	308	DUMP_PREFIX_NONE,
	309	DUMP_PREFIX_ADDRESS,
	310	DUMP_PREFIX_OFFSET
	311	};
c7909234 RD	312	extern void hex_dump_to_buffer(const void *buf, size_t len,
	313	int rowsize, int groupsize,
	314	char *linebuf, size_t linebuflen, bool ascii);
	315	extern void print_hex_dump(const char level, const char prefix_str,
	316	int prefix_type, int rowsize, int groupsize,
6a0ed91e	317	const void *buf, size_t len, bool ascii);
c7909234	318	extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
eb9a9a56	319	const void *buf, size_t len);
3fc95772 HH	320
	321	extern const char hex_asc[];
	322	#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
	323	#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
	324
	325	static inline char pack_hex_byte(char buf, u8 byte)
	326	{
	327	*buf++ = hex_asc_hi(byte);
	328	*buf++ = hex_asc_lo(byte);
	329	return buf;
	330	}
99eaf3c4	331
d091c2f5 MS	332	#ifndef pr_fmt
	333	#define pr_fmt(fmt) fmt
	334	#endif
	335
	336	#define pr_emerg(fmt, ...) \
	337	printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
	338	#define pr_alert(fmt, ...) \
	339	printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
	340	#define pr_crit(fmt, ...) \
	341	printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
	342	#define pr_err(fmt, ...) \
	343	printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
	344	#define pr_warning(fmt, ...) \
	345	printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
	346	#define pr_notice(fmt, ...) \
	347	printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
	348	#define pr_info(fmt, ...) \
	349	printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
1f7c8234	350
1cc6daf2	351	/* If you are writing a driver, please use dev_dbg instead */
346e15be JB	352	#if defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
346e15be JB	353	#define pr_debug(fmt, ...) do { \
d091c2f5	354	dynamic_pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
346e15be JB	355	} while (0)
346e15be JB	356	#elif defined(DEBUG)
d091c2f5 MS	357	#define pr_debug(fmt, ...) \
d091c2f5 MS	358	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1da177e4	359	#else
d091c2f5 MS	360	#define pr_debug(fmt, ...) \
d091c2f5 MS	361	({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
1da177e4 LT	362	#endif
1da177e4 LT	363
1da177e4 LT	364	/*
	365	* Display an IP address in readable format.
	366	*/
	367
	368	#define NIPQUAD(addr) \
	369	((unsigned char *)&addr)[0], \
	370	((unsigned char *)&addr)[1], \
	371	((unsigned char *)&addr)[2], \
	372	((unsigned char *)&addr)[3]
46b86a2d	373	#define NIPQUAD_FMT "%u.%u.%u.%u"
1da177e4	374
1da177e4 LT	375	#if defined(__LITTLE_ENDIAN)
	376	#define HIPQUAD(addr) \
	377	((unsigned char *)&addr)[3], \
	378	((unsigned char *)&addr)[2], \
	379	((unsigned char *)&addr)[1], \
	380	((unsigned char *)&addr)[0]
	381	#elif defined(__BIG_ENDIAN)
	382	#define HIPQUAD NIPQUAD
	383	#else
	384	#error "Please fix asm/byteorder.h"
	385	#endif /* __LITTLE_ENDIAN */
	386
	387	/*
bdf4bbaa	388	* min()/max()/clamp() macros that also do
1da177e4 LT	389	* strict type-checking.. See the
	390	* "unnecessary" pointer comparison.
	391	*/
bdf4bbaa HH	392	#define min(x, y) ({ \
	393	typeof(x) _min1 = (x); \
	394	typeof(y) _min2 = (y); \
	395	(void) (&_min1 == &_min2); \
	396	_min1 < _min2 ? _min1 : _min2; })
	397
	398	#define max(x, y) ({ \
	399	typeof(x) _max1 = (x); \
	400	typeof(y) _max2 = (y); \
	401	(void) (&_max1 == &_max2); \
	402	_max1 > _max2 ? _max1 : _max2; })
	403
	404	/**
	405	* clamp - return a value clamped to a given range with strict typechecking
	406	* @val: current value
	407	* @min: minimum allowable value
	408	* @max: maximum allowable value
	409	*
	410	* This macro does strict typechecking of min/max to make sure they are of the
	411	* same type as val. See the unnecessary pointer comparisons.
	412	*/
	413	#define clamp(val, min, max) ({ \
	414	typeof(val) __val = (val); \
	415	typeof(min) __min = (min); \
	416	typeof(max) __max = (max); \
	417	(void) (&__val == &__min); \
	418	(void) (&__val == &__max); \
	419	__val = __val < __min ? __min: __val; \
	420	__val > __max ? __max: __val; })
1da177e4 LT	421
	422	/*
	423	* ..and if you can't take the strict
	424	* types, you can specify one yourself.
	425	*
bdf4bbaa HH	426	* Or not use min/max/clamp at all, of course.
	427	*/
	428	#define min_t(type, x, y) ({ \
	429	type __min1 = (x); \
	430	type __min2 = (y); \
	431	__min1 < __min2 ? __min1: __min2; })
	432
	433	#define max_t(type, x, y) ({ \
	434	type __max1 = (x); \
	435	type __max2 = (y); \
	436	__max1 > __max2 ? __max1: __max2; })
	437
	438	/**
	439	* clamp_t - return a value clamped to a given range using a given type
	440	* @type: the type of variable to use
	441	* @val: current value
	442	* @min: minimum allowable value
	443	* @max: maximum allowable value
	444	*
	445	* This macro does no typechecking and uses temporary variables of type
	446	* 'type' to make all the comparisons.
1da177e4	447	*/
bdf4bbaa HH	448	#define clamp_t(type, val, min, max) ({ \
	449	type __val = (val); \
	450	type __min = (min); \
	451	type __max = (max); \
	452	__val = __val < __min ? __min: __val; \
	453	__val > __max ? __max: __val; })
1da177e4	454
bdf4bbaa HH	455	/**
	456	* clamp_val - return a value clamped to a given range using val's type
	457	* @val: current value
	458	* @min: minimum allowable value
	459	* @max: maximum allowable value
	460	*
	461	* This macro does no typechecking and uses temporary variables of whatever
	462	* type the input argument 'val' is. This is useful when val is an unsigned
	463	* type and min and max are literals that will otherwise be assigned a signed
	464	* integer type.
	465	*/
	466	#define clamp_val(val, min, max) ({ \
	467	typeof(val) __val = (val); \
	468	typeof(val) __min = (min); \
	469	typeof(val) __max = (max); \
	470	__val = __val < __min ? __min: __val; \
	471	__val > __max ? __max: __val; })
1da177e4 LT	472
	473	/**
	474	* container_of - cast a member of a structure out to the containing structure
1da177e4 LT	475	* @ptr: the pointer to the member.
	476	* @type: the type of the container struct this is embedded in.
	477	* @member: the name of the member within the struct.
	478	*
	479	*/
	480	#define container_of(ptr, type, member) ({ \
78db2ad6 DW	481	const typeof( ((type )0)->member ) __mptr = (ptr); \
78db2ad6 DW	482	(type )( (char )__mptr - offsetof(type,member) );})
1da177e4	483
d4d23add KM	484	struct sysinfo;
	485	extern int do_sysinfo(struct sysinfo *info);
	486
1da177e4 LT	487	#endif /* __KERNEL__ */
	488
	489	#define SI_LOAD_SHIFT 16
	490	struct sysinfo {
	491	long uptime; /* Seconds since boot */
	492	unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
	493	unsigned long totalram; /* Total usable main memory size */
	494	unsigned long freeram; /* Available memory size */
	495	unsigned long sharedram; /* Amount of shared memory */
	496	unsigned long bufferram; /* Memory used by buffers */
	497	unsigned long totalswap; /* Total swap space size */
	498	unsigned long freeswap; /* swap space still available */
	499	unsigned short procs; /* Number of current processes */
	500	unsigned short pad; /* explicit padding for m68k */
	501	unsigned long totalhigh; /* Total high memory size */
	502	unsigned long freehigh; /* Available high memory size */
	503	unsigned int mem_unit; /* Memory unit size in bytes */
	504	char _f[20-2sizeof(long)-sizeof(int)]; / Padding: libc5 uses this.. */
	505	};
	506
c0398ee6	507	/* Force a compilation error if condition is true */
921717a2	508	#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
1da177e4	509
4552d5dc JB	510	/* Force a compilation error if condition is true, but also produce a
	511	result (of value 0 and type size_t), so the expression can be used
	512	e.g. in a structure initializer (or where-ever else comma expressions
	513	aren't permitted). */
	514	#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
	515
1da177e4	516	/* Trap pasters of __FUNCTION__ at compile-time */
1da177e4	517	#define __FUNCTION__ (__func__)
1da177e4	518
08e0f6a9 CL	519	/* This helps us to avoid #ifdef CONFIG_NUMA */
	520	#ifdef CONFIG_NUMA
	521	#define NUMA_BUILD 1
	522	#else
	523	#define NUMA_BUILD 0
	524	#endif
	525
29e71abf SR	526	/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
	527	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
	528	# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
	529	#endif
	530
1da177e4	531	#endif