1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUXKPI_LINUX_ERR_H_ 32 #define _LINUXKPI_LINUX_ERR_H_ 33 34 #include <sys/types.h> 35 36 #include <linux/compiler.h> 37 38 #define MAX_ERRNO 4095 39 40 #define IS_ERR_VALUE(x) unlikely((x) >= (uintptr_t)-MAX_ERRNO) 41 42 static inline void * 43 ERR_PTR(long error) 44 { 45 return (void *)(intptr_t)error; 46 } 47 48 static inline long 49 PTR_ERR(const void *ptr) 50 { 51 return (intptr_t)ptr; 52 } 53 54 static inline bool 55 IS_ERR(const void *ptr) 56 { 57 return IS_ERR_VALUE((uintptr_t)ptr); 58 } 59 60 static inline bool 61 IS_ERR_OR_NULL(const void *ptr) 62 { 63 return !ptr || IS_ERR_VALUE((uintptr_t)ptr); 64 } 65 66 static inline void * 67 ERR_CAST(const void *ptr) 68 { 69 return __DECONST(void *, ptr); 70 } 71 72 static inline int 73 PTR_ERR_OR_ZERO(const void *ptr) 74 { 75 if (IS_ERR(ptr)) 76 return PTR_ERR(ptr); 77 else 78 return 0; 79 } 80 81 #define PTR_RET(p) PTR_ERR_OR_ZERO(p) 82 83 #endif /* _LINUXKPI_LINUX_ERR_H_ */ 84