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
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 {
34 return IS_ERR_VALUE((unsigned long)ptr);
35 }
36
37 /**
38 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
39 * @ptr: The pointer to cast.
40 *
41 * Explicitly cast an error-valued pointer to another pointer type in such a
42 * way as to make it clear that's what's going on.
43 */
44 static inline void *ERR_CAST(const void *ptr)
45 {
46 /* cast away the const */
47 return (void *) ptr;
48 }
49
50 #endif
51
52 #endif /* _LINUX_ERR_H */
53
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