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  1. #ifndef _LINUX_ERR_H
  2. #define _LINUX_ERR_H
  3.  
  4. #include <linux/compiler.h>
  5.  
  6. #include <errno.h>
  7.  
  8. /*
  9.  * Kernel pointers have redundant information, so we can use a
  10.  * scheme where we can return either an error code or a dentry
  11.  * pointer with the same return value.
  12.  *
  13.  * This should be a per-architecture thing, to allow different
  14.  * error and pointer decisions.
  15.  */
  16. #define MAX_ERRNO       4095
  17.  
  18. #ifndef __ASSEMBLY__
  19.  
  20. #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  21.  
  22. static inline void * __must_check ERR_PTR(long error)
  23. {
  24.         return (void *) error;
  25. }
  26.  
  27. static inline long __must_check PTR_ERR(__force const void *ptr)
  28. {
  29.         return (long) ptr;
  30. }
  31.  
  32. static inline long __must_check IS_ERR(__force const void *ptr)
  33. {
  34.         return IS_ERR_VALUE((unsigned long)ptr);
  35. }
  36.  
  37. static inline long __must_check IS_ERR_OR_NULL(__force const void *ptr)
  38. {
  39.         return !ptr || IS_ERR_VALUE((unsigned long)ptr);
  40. }
  41.  
  42. /**
  43.  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
  44.  * @ptr: The pointer to cast.
  45.  *
  46.  * Explicitly cast an error-valued pointer to another pointer type in such a
  47.  * way as to make it clear that's what's going on.
  48.  */
  49. static inline void * __must_check ERR_CAST(__force const void *ptr)
  50. {
  51.         /* cast away the const */
  52.         return (void *) ptr;
  53. }
  54.  
  55. static inline int __must_check PTR_RET(__force const void *ptr)
  56. {
  57.         if (IS_ERR(ptr))
  58.                 return PTR_ERR(ptr);
  59.         else
  60.                 return 0;
  61. }
  62.  
  63. #endif
  64.  
  65. #endif /* _LINUX_ERR_H */
  66.