1 #ifndef ERR_H 2 #define ERR_H 3 #define MAX_ERRNO 4095 4 5 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) 6 7 static inline void * __must_check ERR_PTR(long error) 8 { 9 return (void *) error; 10 } 11 12 static inline long __must_check PTR_ERR(const void *ptr) 13 { 14 return (long) ptr; 15 } 16 17 static inline long __must_check IS_ERR(const void *ptr) 18 { 19 return IS_ERR_VALUE((unsigned long)ptr); 20 } 21 22 static inline long __must_check IS_ERR_OR_NULL(const void *ptr) 23 { 24 return !ptr || IS_ERR_VALUE((unsigned long)ptr); 25 } 26 #endif /* ERR_H */ 27