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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/err.h
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(__force
const void *ptr
)
32 static inline long __must_check
IS_ERR(__force
const void *ptr
)
34 return IS_ERR_VALUE((unsigned long)ptr
);
37 static inline long __must_check
IS_ERR_OR_NULL(__force
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(__force
const void *ptr
)
51 /* cast away the const */
55 static inline int __must_check
PTR_ERR_OR_ZERO(__force
const void *ptr
)
64 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
68 #endif /* _LINUX_ERR_H */