source: GPL/trunk/include/linux/kernel.h

#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H

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

#ifdef __KERNEL__

#include <stdlib.h>
#include <stdarg.h>
//#include <linux/linkage.h>
#include <linux/bitops.h>
#include <linux/gfp.h>
#include <linux/types.h>
#include <linux/log2.h>
#include <linux/string.h>
#include <linux/math.h>
#include <linux/minmax.h>
#include <linux/export.h>

/* Optimization barrier */
/* The "volatile" is due to gcc bugs */
//#define barrier() __asm__ __volatile__("": : :"memory")
#define barrier()

#define STACK_MAGIC     0xdeadbeef

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

#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                 */

# define NORET_TYPE    /**/
# define ATTRIB_NORET  __attribute__((noreturn))
# define NORET_AND     noreturn,

#ifdef __i386__
#define FASTCALL(x)     x __attribute__((regparm(3)))
#else
#define FASTCALL(x)     x
#endif

extern void math_error(void);
extern struct notifier_block *panic_notifier_list;
NORET_TYPE void panic(const char * fmt, ...);

NORET_TYPE void do_exit(long error_code);

#define simple_strtoul strtoul
extern long simple_strtol(const char *,char **,unsigned int);
extern int sprintf(char * buf, const char * fmt, ...);
extern int vsprintf(char *buf, const char *, va_list);
extern int get_option(char **str, int *pint);
extern char *get_options(char *str, int nints, int *ints);

extern int session_of_pgrp(int pgrp);

int cdecl printk(const char * fmt, ...);


/*
 *      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]

#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 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.. */
};

static void complete_and_exit(struct completion *, long);
#define printk_ratelimit()      1
#define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
#define dump_stack()
#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
int strict_strtoul(const char *, unsigned int, unsigned long *);

#define BUG_ON(condition)
#define WARN_ON(condition) (void)0
#define WARN_ON_ONCE(condition) (void)0
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#define SIZE_MAX        (~(size_t)0)
_WCRTLINK extern int     vsnprintf( char *__s, size_t __bufsize,
                                    const char *__format, __va_list __arg );
char *kasprintf(gfp_t gfp, const char *fmt, ...);

char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
extern int hex_to_bin(char ch);
#define __ALIGN_MASK(x, mask)   __ALIGN_KERNEL_MASK((x), (mask))
#define __ALIGN_KERNEL_MASK(x, mask)    (((x) + (mask)) & ~(mask))

/**
 * 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) \
( (type *)( (char *)ptr - offsetof(type,member) ) )

_WCRTLINK extern int    sscanf( const char *__s, const char *__format, ... );
typedef void *acpi_handle;      /* Actually a ptr to a NS Node */
typedef
void (*acpi_notify_handler) (acpi_handle device, u32 value, void *context);
#endif