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59 lines
1.2 KiB
59 lines
1.2 KiB
#ifndef _LINUX_ERR_H |
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#define _LINUX_ERR_H |
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#include <linux/compiler.h> |
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#include <linux/compat.h> |
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#include <linux/errno.h> |
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/* |
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* Kernel pointers have redundant information, so we can use a |
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* scheme where we can return either an error code or a dentry |
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* pointer with the same return value. |
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* |
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* This should be a per-architecture thing, to allow different |
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* error and pointer decisions. |
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*/ |
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#define MAX_ERRNO 4095 |
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#ifndef __ASSEMBLY__ |
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#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
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static inline void *ERR_PTR(long error) |
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{ |
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return (void *) error; |
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} |
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static inline long PTR_ERR(const void *ptr) |
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{ |
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return (long) ptr; |
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} |
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static inline long IS_ERR(const void *ptr) |
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{ |
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return IS_ERR_VALUE((unsigned long)ptr); |
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} |
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static inline bool IS_ERR_OR_NULL(const void *ptr) |
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{ |
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return !ptr || IS_ERR_VALUE((unsigned long)ptr); |
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} |
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/** |
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* ERR_CAST - Explicitly cast an error-valued pointer to another pointer type |
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* @ptr: The pointer to cast. |
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* |
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* Explicitly cast an error-valued pointer to another pointer type in such a |
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* way as to make it clear that's what's going on. |
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*/ |
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static inline void * __must_check ERR_CAST(__force const void *ptr) |
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{ |
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/* cast away the const */ |
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return (void *) ptr; |
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} |
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#endif |
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#endif /* _LINUX_ERR_H */
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