[mirror_ubuntu-bionic-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 <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 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))

#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))

#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;

/**
 * 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))) __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 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);

#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 int log_buf_get_len(void);
extern int log_buf_read(int idx);
extern int log_buf_copy(char *dest, int idx, int len);

extern int printk_ratelimit_jiffies;
extern int printk_ratelimit_burst;
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);
#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 log_buf_get_len(void) { return 0; }
static inline int log_buf_read(int idx) { return 0; }
static inline int log_buf_copy(char *dest, int idx, int len) { return 0; }
static inline int printk_ratelimit(void) { return 0; }
static inline int __printk_ratelimit(int ratelimit_jiffies, \
				     int ratelimit_burst) { return 0; }
static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
					  unsigned int interval_msec)	\
		{ return false; }
#endif

extern void __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 int tainted;
extern const char *print_tainted(void);
extern void add_taint(unsigned);
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	(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)
#define TAINT_DIE			(1<<7)
#define TAINT_OVERRIDDEN_ACPI_TABLE	(1<<8)

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);
#define hex_asc(x)	"0123456789abcdef"[x]

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

#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

/*
 *      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)
2ea58144 LT	36	#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
a83308e6	37	#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
f10db627	38	#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
2ea58144	39
c5e631cf RR	40	#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
c5e631cf RR	41
4552d5dc	42	#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
930631ed	43	#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
b4cac1a0	44	#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
1da177e4	45
2da96acd JA	46	#ifdef CONFIG_LBD
	47	# include <asm/div64.h>
	48	# define sector_div(a, b) do_div(a, b)
	49	#else
	50	# define sector_div(n, b)( \
	51	{ \
	52	int _res; \
	53	_res = (n) % (b); \
	54	(n) /= (b); \
	55	_res; \
	56	} \
	57	)
	58	#endif
	59
218e180e AM	60	/**
	61	* upper_32_bits - return bits 32-63 of a number
	62	* @n: the number we're accessing
	63	*
	64	* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
	65	* the "right shift count >= width of type" warning when that quantity is
	66	* 32-bits.
	67	*/
	68	#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
	69
1da177e4 LT	70	#define KERN_EMERG "<0>" /* system is unusable */
	71	#define KERN_ALERT "<1>" /* action must be taken immediately */
	72	#define KERN_CRIT "<2>" /* critical conditions */
	73	#define KERN_ERR "<3>" /* error conditions */
	74	#define KERN_WARNING "<4>" /* warning conditions */
	75	#define KERN_NOTICE "<5>" /* normal but significant condition */
	76	#define KERN_INFO "<6>" /* informational */
	77	#define KERN_DEBUG "<7>" /* debug-level messages */
	78
47492527 IM	79	/*
	80	* Annotation for a "continued" line of log printout (only done after a
	81	* line that had no enclosing \n). Only to be used by core/arch code
	82	* during early bootup (a continued line is not SMP-safe otherwise).
	83	*/
	84	#define KERN_CONT ""
	85
1da177e4 LT	86	extern int console_printk[];
	87
	88	#define console_loglevel (console_printk[0])
	89	#define default_message_loglevel (console_printk[1])
	90	#define minimum_console_loglevel (console_printk[2])
	91	#define default_console_loglevel (console_printk[3])
	92
	93	struct completion;
df2e71fb	94	struct pt_regs;
df2e71fb	95	struct user;
1da177e4 LT	96
	97	/**
	98	* might_sleep - annotation for functions that can sleep
	99	*
	100	* this macro will print a stack trace if it is executed in an atomic
	101	* context (spinlock, irq-handler, ...).
	102	*
	103	* This is a useful debugging help to be able to catch problems early and not
e20ec991	104	* be bitten later when the calling function happens to sleep when it is not
1da177e4 LT	105	* supposed to.
1da177e4 LT	106	*/
f8cbd99b	107	#ifdef CONFIG_PREEMPT_VOLUNTARY
02b67cc3 HX	108	extern int _cond_resched(void);
02b67cc3 HX	109	# define might_resched() _cond_resched()
f8cbd99b IM	110	#else
	111	# define might_resched() do { } while (0)
	112	#endif
	113
1da177e4	114	#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
f8cbd99b IM	115	void __might_sleep(char *file, int line);
	116	# define might_sleep() \
	117	do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
1da177e4	118	#else
f8cbd99b	119	# define might_sleep() do { might_resched(); } while (0)
1da177e4 LT	120	#endif
1da177e4 LT	121
368a5fa1	122	#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
f8cbd99b	123
1da177e4 LT	124	#define abs(x) ({ \
	125	int __x = (x); \
	126	(__x < 0) ? -__x : __x; \
	127	})
	128
e041c683	129	extern struct atomic_notifier_head panic_notifier_list;
1da177e4 LT	130	extern long (*panic_blink)(long time);
1da177e4 LT	131	NORET_TYPE void panic(const char * fmt, ...)
a586df06	132	__attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
dd287796 AM	133	extern void oops_enter(void);
	134	extern void oops_exit(void);
	135	extern int oops_may_print(void);
ec701584	136	NORET_TYPE void do_exit(long error_code)
1da177e4 LT	137	ATTRIB_NORET;
	138	NORET_TYPE void complete_and_exit(struct completion *, long)
	139	ATTRIB_NORET;
	140	extern unsigned long simple_strtoul(const char ,char *,unsigned int);
	141	extern long simple_strtol(const char ,char *,unsigned int);
	142	extern unsigned long long simple_strtoull(const char ,char *,unsigned int);
	143	extern long long simple_strtoll(const char ,char *,unsigned int);
	144	extern int sprintf(char * buf, const char * fmt, ...)
	145	__attribute__ ((format (printf, 2, 3)));
	146	extern int vsprintf(char buf, const char , va_list)
	147	__attribute__ ((format (printf, 2, 0)));
	148	extern int snprintf(char * buf, size_t size, const char * fmt, ...)
	149	__attribute__ ((format (printf, 3, 4)));
	150	extern int vsnprintf(char buf, size_t size, const char fmt, va_list args)
	151	__attribute__ ((format (printf, 3, 0)));
	152	extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
	153	__attribute__ ((format (printf, 3, 4)));
	154	extern int vscnprintf(char buf, size_t size, const char fmt, va_list args)
	155	__attribute__ ((format (printf, 3, 0)));
e905914f JF	156	extern char kasprintf(gfp_t gfp, const char fmt, ...)
e905914f JF	157	__attribute__ ((format (printf, 2, 3)));
11443ec7	158	extern char kvasprintf(gfp_t gfp, const char fmt, va_list args);
1da177e4 LT	159
	160	extern int sscanf(const char , const char , ...)
	161	__attribute__ ((format (scanf, 2, 3)));
	162	extern int vsscanf(const char , const char , va_list)
	163	__attribute__ ((format (scanf, 2, 0)));
	164
	165	extern int get_option(char *str, int pint);
	166	extern char get_options(const char str, int nints, int *ints);
	167	extern unsigned long long memparse(char ptr, char *retptr);
	168
5e376613	169	extern int core_kernel_text(unsigned long addr);
1da177e4 LT	170	extern int __kernel_text_address(unsigned long addr);
1da177e4 LT	171	extern int kernel_text_address(unsigned long addr);
04a2e6a5 EB	172	struct pid;
04a2e6a5 EB	173	extern struct pid session_of_pgrp(struct pid pgrp);
1da177e4	174
d59745ce	175	#ifdef CONFIG_PRINTK
1da177e4 LT	176	asmlinkage int vprintk(const char *fmt, va_list args)
	177	__attribute__ ((format (printf, 1, 0)));
	178	asmlinkage int printk(const char * fmt, ...)
a586df06	179	__attribute__ ((format (printf, 1, 2))) __cold;
0b15d04a MF	180	extern int log_buf_get_len(void);
	181	extern int log_buf_read(int idx);
	182	extern int log_buf_copy(char *dest, int idx, int len);
7ef3d2fd JP	183
	184	extern int printk_ratelimit_jiffies;
	185	extern int printk_ratelimit_burst;
	186	extern int printk_ratelimit(void);
	187	extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
	188	extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
	189	unsigned int interval_msec);
d59745ce MM	190	#else
	191	static inline int vprintk(const char *s, va_list args)
	192	__attribute__ ((format (printf, 1, 0)));
	193	static inline int vprintk(const char *s, va_list args) { return 0; }
	194	static inline int printk(const char *s, ...)
	195	__attribute__ ((format (printf, 1, 2)));
a586df06	196	static inline int __cold printk(const char *s, ...) { return 0; }
0b15d04a MF	197	static inline int log_buf_get_len(void) { return 0; }
	198	static inline int log_buf_read(int idx) { return 0; }
	199	static inline int log_buf_copy(char *dest, int idx, int len) { return 0; }
7ef3d2fd JP	200	static inline int printk_ratelimit(void) { return 0; }
	201	static inline int __printk_ratelimit(int ratelimit_jiffies, \
	202	int ratelimit_burst) { return 0; }
	203	static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
	204	unsigned int interval_msec) \
	205	{ return false; }
d59745ce	206	#endif
1da177e4	207
076f9776 IM	208	extern void __attribute__((format(printf, 1, 2)))
	209	early_printk(const char *fmt, ...);
	210
1da177e4 LT	211	unsigned long int_sqrt(unsigned long);
1da177e4 LT	212
1da177e4 LT	213	static inline void console_silent(void)
	214	{
	215	console_loglevel = 0;
	216	}
	217
	218	static inline void console_verbose(void)
	219	{
	220	if (console_loglevel)
	221	console_loglevel = 15;
	222	}
	223
	224	extern void bust_spinlocks(int yes);
e3e8a75d	225	extern void wake_up_klogd(void);
1da177e4	226	extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
aa727107	227	extern int panic_timeout;
1da177e4	228	extern int panic_on_oops;
8da5adda	229	extern int panic_on_unrecovered_nmi;
1da177e4 LT	230	extern int tainted;
	231	extern const char *print_tainted(void);
	232	extern void add_taint(unsigned);
b920de1b	233	extern int root_mountflags;
1da177e4 LT	234
	235	/* Values used for system_state */
	236	extern enum system_states {
	237	SYSTEM_BOOTING,
	238	SYSTEM_RUNNING,
	239	SYSTEM_HALT,
	240	SYSTEM_POWER_OFF,
	241	SYSTEM_RESTART,
729b4d4c	242	SYSTEM_SUSPEND_DISK,
1da177e4 LT	243	} system_state;
	244
	245	#define TAINT_PROPRIETARY_MODULE (1<<0)
	246	#define TAINT_FORCED_MODULE (1<<1)
	247	#define TAINT_UNSAFE_SMP (1<<2)
	248	#define TAINT_FORCED_RMMOD (1<<3)
	249	#define TAINT_MACHINE_CHECK (1<<4)
	250	#define TAINT_BAD_PAGE (1<<5)
34f5a398	251	#define TAINT_USER (1<<6)
bcdcd8e7	252	#define TAINT_DIE (1<<7)
6ed31e92	253	#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
1da177e4	254
a586df06	255	extern void dump_stack(void) __cold;
1da177e4	256
99eaf3c4 RD	257	enum {
	258	DUMP_PREFIX_NONE,
	259	DUMP_PREFIX_ADDRESS,
	260	DUMP_PREFIX_OFFSET
	261	};
c7909234 RD	262	extern void hex_dump_to_buffer(const void *buf, size_t len,
	263	int rowsize, int groupsize,
	264	char *linebuf, size_t linebuflen, bool ascii);
	265	extern void print_hex_dump(const char level, const char prefix_str,
	266	int prefix_type, int rowsize, int groupsize,
6a0ed91e	267	const void *buf, size_t len, bool ascii);
c7909234	268	extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
eb9a9a56	269	const void *buf, size_t len);
99eaf3c4 RD	270	#define hex_asc(x) "0123456789abcdef"[x]
99eaf3c4 RD	271
1f7c8234 EM	272	#define pr_emerg(fmt, arg...) \
	273	printk(KERN_EMERG fmt, ##arg)
	274	#define pr_alert(fmt, arg...) \
	275	printk(KERN_ALERT fmt, ##arg)
	276	#define pr_crit(fmt, arg...) \
	277	printk(KERN_CRIT fmt, ##arg)
	278	#define pr_err(fmt, arg...) \
	279	printk(KERN_ERR fmt, ##arg)
	280	#define pr_warning(fmt, arg...) \
	281	printk(KERN_WARNING fmt, ##arg)
	282	#define pr_notice(fmt, arg...) \
	283	printk(KERN_NOTICE fmt, ##arg)
	284	#define pr_info(fmt, arg...) \
	285	printk(KERN_INFO fmt, ##arg)
	286
1da177e4	287	#ifdef DEBUG
1cc6daf2	288	/* If you are writing a driver, please use dev_dbg instead */
1f7c8234 EM	289	#define pr_debug(fmt, arg...) \
1f7c8234 EM	290	printk(KERN_DEBUG fmt, ##arg)
1da177e4	291	#else
8b2a1fd1 ZB	292	static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
	293	{
	294	return 0;
	295	}
1da177e4 LT	296	#endif
1da177e4 LT	297
1da177e4 LT	298	/*
	299	* Display an IP address in readable format.
	300	*/
	301
	302	#define NIPQUAD(addr) \
	303	((unsigned char *)&addr)[0], \
	304	((unsigned char *)&addr)[1], \
	305	((unsigned char *)&addr)[2], \
	306	((unsigned char *)&addr)[3]
46b86a2d	307	#define NIPQUAD_FMT "%u.%u.%u.%u"
1da177e4 LT	308
	309	#define NIP6(addr) \
	310	ntohs((addr).s6_addr16[0]), \
	311	ntohs((addr).s6_addr16[1]), \
	312	ntohs((addr).s6_addr16[2]), \
	313	ntohs((addr).s6_addr16[3]), \
	314	ntohs((addr).s6_addr16[4]), \
	315	ntohs((addr).s6_addr16[5]), \
	316	ntohs((addr).s6_addr16[6]), \
	317	ntohs((addr).s6_addr16[7])
46b86a2d	318	#define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
9343e79a	319	#define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
1da177e4 LT	320
	321	#if defined(__LITTLE_ENDIAN)
	322	#define HIPQUAD(addr) \
	323	((unsigned char *)&addr)[3], \
	324	((unsigned char *)&addr)[2], \
	325	((unsigned char *)&addr)[1], \
	326	((unsigned char *)&addr)[0]
	327	#elif defined(__BIG_ENDIAN)
	328	#define HIPQUAD NIPQUAD
	329	#else
	330	#error "Please fix asm/byteorder.h"
	331	#endif /* __LITTLE_ENDIAN */
	332
	333	/*
	334	* min()/max() macros that also do
	335	* strict type-checking.. See the
	336	* "unnecessary" pointer comparison.
	337	*/
	338	#define min(x,y) ({ \
	339	typeof(x) _x = (x); \
	340	typeof(y) _y = (y); \
	341	(void) (&_x == &_y); \
	342	_x < _y ? _x : _y; })
	343
	344	#define max(x,y) ({ \
	345	typeof(x) _x = (x); \
	346	typeof(y) _y = (y); \
	347	(void) (&_x == &_y); \
	348	_x > _y ? _x : _y; })
	349
	350	/*
	351	* ..and if you can't take the strict
	352	* types, you can specify one yourself.
	353	*
	354	* Or not use min/max at all, of course.
	355	*/
	356	#define min_t(type,x,y) \
	357	({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
	358	#define max_t(type,x,y) \
	359	({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
	360
	361
	362	/**
	363	* container_of - cast a member of a structure out to the containing structure
1da177e4 LT	364	* @ptr: the pointer to the member.
	365	* @type: the type of the container struct this is embedded in.
	366	* @member: the name of the member within the struct.
	367	*
	368	*/
	369	#define container_of(ptr, type, member) ({ \
78db2ad6 DW	370	const typeof( ((type )0)->member ) __mptr = (ptr); \
78db2ad6 DW	371	(type )( (char )__mptr - offsetof(type,member) );})
1da177e4 LT	372
	373	/*
	374	* Check at compile time that something is of a particular type.
	375	* Always evaluates to 1 so you may use it easily in comparisons.
	376	*/
	377	#define typecheck(type,x) \
	378	({ type __dummy; \
	379	typeof(x) __dummy2; \
	380	(void)(&__dummy == &__dummy2); \
	381	1; \
	382	})
	383
711a660d CE	384	/*
	385	* Check at compile time that 'function' is a certain type, or is a pointer
	386	* to that type (needs to use typedef for the function type.)
	387	*/
	388	#define typecheck_fn(type,function) \
	389	({ typeof(type) __tmp = function; \
	390	(void)__tmp; \
	391	})
	392
d4d23add KM	393	struct sysinfo;
	394	extern int do_sysinfo(struct sysinfo *info);
	395
1da177e4 LT	396	#endif /* __KERNEL__ */
	397
	398	#define SI_LOAD_SHIFT 16
	399	struct sysinfo {
	400	long uptime; /* Seconds since boot */
	401	unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
	402	unsigned long totalram; /* Total usable main memory size */
	403	unsigned long freeram; /* Available memory size */
	404	unsigned long sharedram; /* Amount of shared memory */
	405	unsigned long bufferram; /* Memory used by buffers */
	406	unsigned long totalswap; /* Total swap space size */
	407	unsigned long freeswap; /* swap space still available */
	408	unsigned short procs; /* Number of current processes */
	409	unsigned short pad; /* explicit padding for m68k */
	410	unsigned long totalhigh; /* Total high memory size */
	411	unsigned long freehigh; /* Available high memory size */
	412	unsigned int mem_unit; /* Memory unit size in bytes */
	413	char _f[20-2sizeof(long)-sizeof(int)]; / Padding: libc5 uses this.. */
	414	};
	415
c0398ee6	416	/* Force a compilation error if condition is true */
921717a2	417	#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
1da177e4	418
4552d5dc JB	419	/* Force a compilation error if condition is true, but also produce a
	420	result (of value 0 and type size_t), so the expression can be used
	421	e.g. in a structure initializer (or where-ever else comma expressions
	422	aren't permitted). */
	423	#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
	424
1da177e4	425	/* Trap pasters of __FUNCTION__ at compile-time */
1da177e4	426	#define __FUNCTION__ (__func__)
1da177e4	427
08e0f6a9 CL	428	/* This helps us to avoid #ifdef CONFIG_NUMA */
	429	#ifdef CONFIG_NUMA
	430	#define NUMA_BUILD 1
	431	#else
	432	#define NUMA_BUILD 0
	433	#endif
	434
1da177e4	435	#endif