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Rev | Author | Line No. | Line |
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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 | |||
4065 | Serge | 55 | static inline int __must_check PTR_RET(__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 | |||
63 | #endif |
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64 | |||
65 | #endif /* _LINUX_ERR_H */ |