| #include <linux/compiler.h> |
| * Kernel pointers have redundant information, so we can use a |
| * scheme where we can return either an error code or a dentry |
| * pointer with the same return value. |
| * This should be a per-architecture thing, to allow different |
| * error and pointer decisions. |
| #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
| static inline void *ERR_PTR(long error) |
| static inline long PTR_ERR(const void *ptr) |
| static inline long IS_ERR(const void *ptr) |
| return IS_ERR_VALUE((unsigned long)ptr); |
| static inline long IS_ERR_OR_NULL(const void *ptr) |
| return !ptr || IS_ERR_VALUE((unsigned long)ptr); |
| * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type |
| * @ptr: The pointer to cast. |
| * Explicitly cast an error-valued pointer to another pointer type in such a |
| * way as to make it clear that's what's going on. |
| static inline void *ERR_CAST(const void *ptr) |
| /* cast away the const */ |
| #endif /* _LINUX_ERR_H */ |