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 */
16#define MAX_ERRNO	4095
17
18#ifndef __ASSEMBLY__
19
20#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
21
22static inline void *ERR_PTR(long error)
23{
24	return (void *) error;
25}
26
27static inline long PTR_ERR(const void *ptr)
28{
29	return (long) ptr;
30}
31
32static inline long IS_ERR(const void *ptr)
33{
34	return IS_ERR_VALUE((unsigned long)ptr);
35}
36
37#endif
38
39#endif /* _LINUX_ERR_H */
40