1 #ifndef _LINUX_ERR_H 2 #define _LINUX_ERR_H 3 4 /* XXX U-BOOT XXX */ 5 #if 0 6 #include <linux/compiler.h> 7 #else 8 #include <linux/mtd/compat.h> 9 #endif 10 11 #include <asm/errno.h> 12 13 14 /* 15 * Kernel pointers have redundant information, so we can use a 16 * scheme where we can return either an error code or a dentry 17 * pointer with the same return value. 18 * 19 * This should be a per-architecture thing, to allow different 20 * error and pointer decisions. 21 */ 22 #define MAX_ERRNO 4095 23 24 #ifndef __ASSEMBLY__ 25 26 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) 27 28 static inline void *ERR_PTR(long error) 29 { 30 return (void *) error; 31 } 32 33 static inline long PTR_ERR(const void *ptr) 34 { 35 return (long) ptr; 36 } 37 38 static inline long IS_ERR(const void *ptr) 39 { 40 return IS_ERR_VALUE((unsigned long)ptr); 41 } 42 43 #endif 44 45 #endif /* _LINUX_ERR_H */ 46