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Linux/tools/include/linux/err.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __TOOLS_LINUX_ERR_H
  3 #define __TOOLS_LINUX_ERR_H
  4 
  5 #include <linux/compiler.h>
  6 #include <linux/types.h>
  7 
  8 #include <asm/errno.h>
  9 
 10 /*
 11  * Original kernel header comment:
 12  *
 13  * Kernel pointers have redundant information, so we can use a
 14  * scheme where we can return either an error code or a normal
 15  * pointer with the same return value.
 16  *
 17  * This should be a per-architecture thing, to allow different
 18  * error and pointer decisions.
 19  *
 20  * Userspace note:
 21  * The same principle works for userspace, because 'error' pointers
 22  * fall down to the unused hole far from user space, as described
 23  * in Documentation/x86/x86_64/mm.txt for x86_64 arch:
 24  *
 25  * 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
 26  * ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
 27  *
 28  * It should be the same case for other architectures, because
 29  * this code is used in generic kernel code.
 30  */
 31 #define MAX_ERRNO       4095
 32 
 33 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 34 
 35 static inline void * __must_check ERR_PTR(long error_)
 36 {
 37         return (void *) error_;
 38 }
 39 
 40 static inline long __must_check PTR_ERR(__force const void *ptr)
 41 {
 42         return (long) ptr;
 43 }
 44 
 45 static inline bool __must_check IS_ERR(__force const void *ptr)
 46 {
 47         return IS_ERR_VALUE((unsigned long)ptr);
 48 }
 49 
 50 static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
 51 {
 52         return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
 53 }
 54 
 55 #endif /* _LINUX_ERR_H */
 56 

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