4 #include <linux/compiler.h>
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.
13 * This should be a per-architecture thing, to allow different
14 * error and pointer decisions.
16 #define MAX_ERRNO 4095
20 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
22 static inline void *ERR_PTR(long error
)
24 return (void *) error
;
27 static inline long PTR_ERR(const void *ptr
)
32 static inline long IS_ERR(const void *ptr
)
34 return IS_ERR_VALUE((unsigned long)ptr
);
38 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
39 * @ptr: The pointer to cast.
41 * Explicitly cast an error-valued pointer to another pointer type in such a
42 * way as to make it clear that's what's going on.
44 static inline void *ERR_CAST(const void *ptr
)
46 /* cast away the const */
52 #endif /* _LINUX_ERR_H */
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