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Merge tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg...
[mirror_ubuntu-bionic-kernel.git] / include / linux / err.h
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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 */
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16#define MAX_ERRNO 4095
17
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18#ifndef __ASSEMBLY__
19
fa79837d 20#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
07ab67c8 21
e47103b1 22static inline void * __must_check ERR_PTR(long error)
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23{
24 return (void *) error;
25}
26
e7152b97 27static inline long __must_check PTR_ERR(__force const void *ptr)
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28{
29 return (long) ptr;
30}
31
e7152b97 32static inline long __must_check IS_ERR(__force const void *ptr)
1da177e4 33{
07ab67c8 34 return IS_ERR_VALUE((unsigned long)ptr);
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35}
36
e7152b97 37static inline long __must_check IS_ERR_OR_NULL(__force const void *ptr)
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38{
39 return !ptr || IS_ERR_VALUE((unsigned long)ptr);
40}
41
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42/**
43 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
44 * @ptr: The pointer to cast.
45 *
46 * Explicitly cast an error-valued pointer to another pointer type in such a
47 * way as to make it clear that's what's going on.
48 */
e7152b97 49static inline void * __must_check ERR_CAST(__force const void *ptr)
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50{
51 /* cast away the const */
52 return (void *) ptr;
53}
54
6e8b8726 55static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
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56{
57 if (IS_ERR(ptr))
58 return PTR_ERR(ptr);
59 else
60 return 0;
61}
62
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63/* Deprecated */
64#define PTR_RET(p) PTR_ERR_OR_ZERO(p)
65
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66#endif
67
1da177e4 68#endif /* _LINUX_ERR_H */