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 MAX_ERRNO 4095 17 18#ifndef __ASSEMBLY__ 19 20#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) 21 22static inline void *ERR_PTR(long error) 23{ 24 return (void *) error; 25} 26 27static inline long PTR_ERR(const void *ptr) 28{ 29 return (long) ptr; 30} 31 32static inline long IS_ERR(const void *ptr) 33{ 34 return IS_ERR_VALUE((unsigned long)ptr); 35} 36 37#endif 38 39#endif /* _LINUX_ERR_H */ 40