[deliverable/linux.git] / include / linux / err.h

#ifndef _LINUX_ERR_H
#define _LINUX_ERR_H

#include <linux/compiler.h>

#include <asm/errno.h>

/*
 * Kernel pointers have redundant information, so we can use a
 * scheme where we can return either an error code or a dentry
 * pointer with the same return value.
 *
 * This should be a per-architecture thing, to allow different
 * error and pointer decisions.
 */
#define IS_ERR_VALUE(x) unlikely((x) > (unsigned long)-1000L)

static inline void *ERR_PTR(long error)
{
	return (void *) error;
}

static inline long PTR_ERR(const void *ptr)
{
	return (long) ptr;
}

static inline long IS_ERR(const void *ptr)
{
	return IS_ERR_VALUE((unsigned long)ptr);
}

#endif /* _LINUX_ERR_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_ERR_H
	2	#define _LINUX_ERR_H
	3
	4	#include <linux/compiler.h>
	5
	6	#include <asm/errno.h>
	7
	8	/*
	9	* Kernel pointers have redundant information, so we can use a
	10	* scheme where we can return either an error code or a dentry
	11	* pointer with the same return value.
	12	*
	13	* This should be a per-architecture thing, to allow different
	14	* error and pointer decisions.
	15	*/
07ab67c8 LT	16	#define IS_ERR_VALUE(x) unlikely((x) > (unsigned long)-1000L)
07ab67c8 LT	17
1da177e4 LT	18	static inline void *ERR_PTR(long error)
	19	{
	20	return (void *) error;
	21	}
	22
	23	static inline long PTR_ERR(const void *ptr)
	24	{
	25	return (long) ptr;
	26	}
	27
	28	static inline long IS_ERR(const void *ptr)
	29	{
07ab67c8	30	return IS_ERR_VALUE((unsigned long)ptr);
1da177e4 LT	31	}
	32
	33	#endif /* _LINUX_ERR_H */