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#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 MAX_ERRNO	4095
 
#ifndef __ASSEMBLY__
 
#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 
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
 
#endif /* _LINUX_ERR_H */