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git.ipfire.org Git - people/ms/u-boot.git/blob - include/linux/err.h
4 #include <linux/compiler.h>
5 #include <linux/compat.h>
7 #include <linux/errno.h>
11 * Kernel pointers have redundant information, so we can use a
12 * scheme where we can return either an error code or a dentry
13 * pointer with the same return value.
15 * This should be a per-architecture thing, to allow different
16 * error and pointer decisions.
18 #define MAX_ERRNO 4095
22 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
24 static inline void *ERR_PTR(long error
)
26 return (void *) error
;
29 static inline long PTR_ERR(const void *ptr
)
34 static inline long IS_ERR(const void *ptr
)
36 return IS_ERR_VALUE((unsigned long)ptr
);
40 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
41 * @ptr: The pointer to cast.
43 * Explicitly cast an error-valued pointer to another pointer type in such a
44 * way as to make it clear that's what's going on.
46 static inline void * __must_check
ERR_CAST(__force
const void *ptr
)
48 /* cast away the const */
54 #endif /* _LINUX_ERR_H */