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Linux/tools/include/linux/err.h

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  1 #ifndef __TOOLS_LINUX_ERR_H
  2 #define __TOOLS_LINUX_ERR_H
  3 
  4 #include <linux/compiler.h>
  5 #include <linux/types.h>
  6 
  7 #include <asm/errno.h>
  8 
  9 /*
 10  * Original kernel header comment:
 11  *
 12  * Kernel pointers have redundant information, so we can use a
 13  * scheme where we can return either an error code or a normal
 14  * pointer with the same return value.
 15  *
 16  * This should be a per-architecture thing, to allow different
 17  * error and pointer decisions.
 18  *
 19  * Userspace note:
 20  * The same principle works for userspace, because 'error' pointers
 21  * fall down to the unused hole far from user space, as described
 22  * in Documentation/x86/x86_64/mm.txt for x86_64 arch:
 23  *
 24  * 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
 25  * ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
 26  *
 27  * It should be the same case for other architectures, because
 28  * this code is used in generic kernel code.
 29  */
 30 #define MAX_ERRNO       4095
 31 
 32 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 33 
 34 static inline void * __must_check ERR_PTR(long error_)
 35 {
 36         return (void *) error_;
 37 }
 38 
 39 static inline long __must_check PTR_ERR(__force const void *ptr)
 40 {
 41         return (long) ptr;
 42 }
 43 
 44 static inline bool __must_check IS_ERR(__force const void *ptr)
 45 {
 46         return IS_ERR_VALUE((unsigned long)ptr);
 47 }
 48 
 49 #endif /* _LINUX_ERR_H */
 50 

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