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 #ifndef _LINUXKPI_LINUX_ERR_H_
30 #define _LINUXKPI_LINUX_ERR_H_
31
32 #include <sys/types.h>
33
34 #include <linux/compiler.h>
35
36 #define MAX_ERRNO 4095
37
38 #define IS_ERR_VALUE(x) unlikely((x) >= (uintptr_t)-MAX_ERRNO)
39
40 static inline void *
ERR_PTR(long error)41 ERR_PTR(long error)
42 {
43 return (void *)(intptr_t)error;
44 }
45
46 static inline long
PTR_ERR(const void * ptr)47 PTR_ERR(const void *ptr)
48 {
49 return (intptr_t)ptr;
50 }
51
52 static inline bool
IS_ERR(const void * ptr)53 IS_ERR(const void *ptr)
54 {
55 return IS_ERR_VALUE((uintptr_t)ptr);
56 }
57
58 static inline bool
IS_ERR_OR_NULL(const void * ptr)59 IS_ERR_OR_NULL(const void *ptr)
60 {
61 return !ptr || IS_ERR_VALUE((uintptr_t)ptr);
62 }
63
64 static inline void *
ERR_CAST(const void * ptr)65 ERR_CAST(const void *ptr)
66 {
67 return __DECONST(void *, ptr);
68 }
69
70 static inline int
PTR_ERR_OR_ZERO(const void * ptr)71 PTR_ERR_OR_ZERO(const void *ptr)
72 {
73 if (IS_ERR(ptr))
74 return PTR_ERR(ptr);
75 else
76 return 0;
77 }
78
79 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
80
81 #endif /* _LINUXKPI_LINUX_ERR_H_ */
82