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 static inline void *ERR_PTR(long error) 17 { 18 return (void *) error; 19 } 20 21 static inline long PTR_ERR(const void *ptr) 22 { 23 return (long) ptr; 24 } 25 26 static inline long IS_ERR(const void *ptr) 27 { 28 return unlikely((unsigned long)ptr > (unsigned long)-1000L); 29 } 30 31 #endif /* _LINUX_ERR_H */ 32