1 #ifndef _LINUX_ERR_H 2 #define _LINUX_ERR_H 3 4 #include <linux/compiler.h> 5 6 #include <asm/errno.h> 7 8 /* 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. 12 * 13 * This should be a per-architecture thing, to allow different 14 * error and pointer decisions. 15 */ 16 #define IS_ERR_VALUE(x) unlikely((x) > (unsigned long)-1000L) 17 18 static inline void *ERR_PTR(long error) 19 { 20 return (void *) error; 21 } 22 23 static inline long PTR_ERR(const void *ptr) 24 { 25 return (long) ptr; 26 } 27 28 static inline long IS_ERR(const void *ptr) 29 { 30 return IS_ERR_VALUE((unsigned long)ptr); 31 } 32 33 #endif /* _LINUX_ERR_H */ 34