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 * __must_check
ERR_PTR(long error
)
24 return (void *) error
;
27 static inline long __must_check
PTR_ERR(const void *ptr
)
32 static inline long __must_check
IS_ERR(const void *ptr
)
34 return IS_ERR_VALUE((unsigned long)ptr
);
37 static inline long __must_check
IS_ERR_OR_NULL(const void *ptr
)
39 return !ptr
|| IS_ERR_VALUE((unsigned long)ptr
);
43 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
44 * @ptr: The pointer to cast.
46 * Explicitly cast an error-valued pointer to another pointer type in such a
47 * way as to make it clear that's what's going on.
49 static inline void * __must_check
ERR_CAST(const void *ptr
)
51 /* cast away the const */
55 static inline int __must_check
PTR_RET(const void *ptr
)
65 #endif /* _LINUX_ERR_H */
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