sys/dev/drm/include/linux/err.h

   1 /*-
   2  * Copyright (c) 2010 Isilon Systems, Inc.
   3  * Copyright (c) 2010 iX Systems, Inc.
   4  * Copyright (c) 2010 Panasas, Inc.
   5  * Copyright (c) 2016 François Tigeot
   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
  30 #ifndef _LINUX_ERR_H_
  31 #define _LINUX_ERR_H_
  32
  33 #define MAX_ERRNO       4095
  34
  35 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
  36
  37 static inline void *
  38 ERR_PTR(long error)
  39 {
  40         return (void *)error;
  41 }
  42
  43 static inline long
  44 PTR_ERR(const void *ptr)
  45 {
  46         return (long)ptr;
  47 }
  48
  49 static inline long
  50 IS_ERR(const void *ptr)
  51 {
  52         return IS_ERR_VALUE((unsigned long)ptr);
  53 }
  54
  55 static inline long
  56 IS_ERR_OR_NULL(const void *ptr)
  57 {
  58         return !ptr || IS_ERR_VALUE((unsigned long)ptr);
  59 }
  60
  61 static inline void *
  62 ERR_CAST(void *ptr)
  63 {
  64         return (void *)ptr;
  65 }
  66
  67 static inline int PTR_ERR_OR_ZERO( const void *ptr)
  68 {
  69         if (IS_ERR(ptr))
  70                 return PTR_ERR(ptr);
  71
  72         return 0;
  73 }
  74
  75 #endif  /* _LINUX_ERR_H_ */