4 #include <linux/compiler.h>
5 #include <linux/types.h>
10 * Kernel pointers have redundant information, so we can use a
11 * scheme where we can return either an error code or a normal
12 * pointer with the same return value.
14 * This should be a per-architecture thing, to allow different
15 * error and pointer decisions.
17 #define MAX_ERRNO 4095
21 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
23 static inline void * __must_check
ERR_PTR(long error
)
25 return (void *) error
;
28 static inline long __must_check
PTR_ERR(__force
const void *ptr
)
33 static inline bool __must_check
IS_ERR(__force
const void *ptr
)
35 return IS_ERR_VALUE((unsigned long)ptr
);
38 static inline bool __must_check
IS_ERR_OR_NULL(__force
const void *ptr
)
40 return !ptr
|| IS_ERR_VALUE((unsigned long)ptr
);
44 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
45 * @ptr: The pointer to cast.
47 * Explicitly cast an error-valued pointer to another pointer type in such a
48 * way as to make it clear that's what's going on.
50 static inline void * __must_check
ERR_CAST(__force
const void *ptr
)
52 /* cast away the const */
56 static inline int __must_check
PTR_ERR_OR_ZERO(__force
const void *ptr
)
65 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
69 #endif /* _LINUX_ERR_H */
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