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  1. #ifndef _LINUX_ERR_H
  2. #define _LINUX_ERR_H
  3.  
  4. #include <linux/compiler.h>
  5. #include <linux/types.h>
  6.  
  7. #include <asm/errno.h>
  8.  
  9. /*
  10.  * Kernel pointers have redundant information, so we can use a
  11.  * scheme where we can return either an error code or a normal
  12.  * pointer with the same return value.
  13.  *
  14.  * This should be a per-architecture thing, to allow different
  15.  * error and pointer decisions.
  16.  */
  17. #define MAX_ERRNO       4095
  18.  
  19. #ifndef __ASSEMBLY__
  20.  
  21. #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  22.  
  23. static inline void * __must_check ERR_PTR(long error)
  24. {
  25.         return (void *) error;
  26. }
  27.  
  28. static inline long __must_check PTR_ERR(__force const void *ptr)
  29. {
  30.         return (long) ptr;
  31. }
  32.  
  33. static inline bool __must_check IS_ERR(__force const void *ptr)
  34. {
  35.         return IS_ERR_VALUE((unsigned long)ptr);
  36. }
  37.  
  38. static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
  39. {
  40.         return !ptr || IS_ERR_VALUE((unsigned long)ptr);
  41. }
  42.  
  43. /**
  44.  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
  45.  * @ptr: The pointer to cast.
  46.  *
  47.  * Explicitly cast an error-valued pointer to another pointer type in such a
  48.  * way as to make it clear that's what's going on.
  49.  */
  50. static inline void * __must_check ERR_CAST(__force const void *ptr)
  51. {
  52.         /* cast away the const */
  53.         return (void *) ptr;
  54. }
  55.  
  56. static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
  57. {
  58.         if (IS_ERR(ptr))
  59.                 return PTR_ERR(ptr);
  60.         else
  61.                 return 0;
  62. }
  63.  
  64. /* Deprecated */
  65. #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
  66.  
  67. #endif
  68.  
  69. #endif /* _LINUX_ERR_H */
  70.