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1 | #ifndef _ERR_H |
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2 | #define _ERR_H |
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3 | |
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4 | #include <errno.h> |
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5 | |
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6 | /* |
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7 | * Kernel pointers have redundant information, so we can use a |
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8 | * scheme where we can return either an error code or a dentry |
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9 | * pointer with the same return value. |
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10 | * |
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11 | * This should be a per-architecture thing, to allow different |
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12 | * error and pointer decisions. |
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13 | */ |
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14 | #define IS_ERR_VALUE(x) ((x) > (unsigned long)-1000L) |
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15 | |
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16 | static inline void *ERR_PTR(long error) |
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17 | { |
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18 | return (void *) error; |
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19 | } |
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20 | |
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21 | static inline long PTR_ERR(const void *ptr) |
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22 | { |
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23 | return (long) ptr; |
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24 | } |
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25 | |
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26 | static inline long IS_ERR(const void *ptr) |
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27 | { |
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28 | return IS_ERR_VALUE((unsigned long)ptr); |
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29 | } |
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30 | |
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31 | #endif /* _LINUX_ERR_H */ |
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