Commit | Line | Data |
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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 | */ | |
fa79837d RB |
16 | #define MAX_ERRNO 4095 |
17 | ||
ebba5f9f RD |
18 | #ifndef __ASSEMBLY__ |
19 | ||
fa79837d | 20 | #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
07ab67c8 | 21 | |
1da177e4 LT |
22 | static inline void *ERR_PTR(long error) |
23 | { | |
24 | return (void *) error; | |
25 | } | |
26 | ||
27 | static inline long PTR_ERR(const void *ptr) | |
28 | { | |
29 | return (long) ptr; | |
30 | } | |
31 | ||
32 | static inline long IS_ERR(const void *ptr) | |
33 | { | |
07ab67c8 | 34 | return IS_ERR_VALUE((unsigned long)ptr); |
1da177e4 LT |
35 | } |
36 | ||
ebba5f9f RD |
37 | #endif |
38 | ||
1da177e4 | 39 | #endif /* _LINUX_ERR_H */ |