include/linux/err.h

   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 */