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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3243 | Serge | 1 | #ifndef _LINUX_ERR_H |
| 2 | #define _LINUX_ERR_H |
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| 3 | |||
| 4 | #include |
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| 5 | |||
| 6 | #include |
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| 7 | |||
| 8 | /* |
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| 9 | * Kernel pointers have redundant information, so we can use a |
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| 10 | * scheme where we can return either an error code or a dentry |
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| 11 | * pointer with the same return value. |
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| 12 | * |
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| 13 | * This should be a per-architecture thing, to allow different |
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| 14 | * error and pointer decisions. |
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| 15 | */ |
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| 16 | #define MAX_ERRNO 4095 |
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| 17 | |||
| 18 | #ifndef __ASSEMBLY__ |
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| 19 | |||
| 20 | #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
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| 21 | |||
| 22 | static inline void * __must_check ERR_PTR(long error) |
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| 23 | { |
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| 24 | return (void *) error; |
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| 25 | } |
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| 26 | |||
| 4065 | Serge | 27 | static inline long __must_check PTR_ERR(__force const void *ptr) |
| 3243 | Serge | 28 | { |
| 29 | return (long) ptr; |
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| 30 | } |
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| 31 | |||
| 4065 | Serge | 32 | static inline long __must_check IS_ERR(__force const void *ptr) |
| 3243 | Serge | 33 | { |
| 34 | return IS_ERR_VALUE((unsigned long)ptr); |
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| 35 | } |
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| 36 | |||
| 4065 | Serge | 37 | static inline long __must_check IS_ERR_OR_NULL(__force const void *ptr) |
| 3243 | Serge | 38 | { |
| 39 | return !ptr || IS_ERR_VALUE((unsigned long)ptr); |
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| 40 | } |
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| 41 | |||
| 42 | /** |
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| 43 | * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type |
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| 44 | * @ptr: The pointer to cast. |
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| 45 | * |
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| 46 | * Explicitly cast an error-valued pointer to another pointer type in such a |
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| 47 | * way as to make it clear that's what's going on. |
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| 48 | */ |
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| 4065 | Serge | 49 | static inline void * __must_check ERR_CAST(__force const void *ptr) |
| 3243 | Serge | 50 | { |
| 51 | /* cast away the const */ |
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| 52 | return (void *) ptr; |
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| 53 | } |
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| 54 | |||
| 4103 | Serge | 55 | static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr) |
| 3243 | Serge | 56 | { |
| 57 | if (IS_ERR(ptr)) |
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| 58 | return PTR_ERR(ptr); |
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| 59 | else |
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| 60 | return 0; |
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| 61 | } |
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| 62 | |||
| 4103 | Serge | 63 | /* Deprecated */ |
| 64 | #define PTR_RET(p) PTR_ERR_OR_ZERO(p) |
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| 65 | |||
| 3243 | Serge | 66 | #endif |
| 67 | |||
| 68 | #endif /* _LINUX_ERR_H */ |