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TOMOYO Linux Cross Reference
Linux/include/linux/err.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_ERR_H
  3 #define _LINUX_ERR_H
  4 
  5 #include <linux/compiler.h>
  6 #include <linux/types.h>
  7 
  8 #include <asm/errno.h>
  9 
 10 /*
 11  * Kernel pointers have redundant information, so we can use a
 12  * scheme where we can return either an error code or a normal
 13  * pointer with the same return value.
 14  *
 15  * This should be a per-architecture thing, to allow different
 16  * error and pointer decisions.
 17  */
 18 #define MAX_ERRNO       4095
 19 
 20 #ifndef __ASSEMBLY__
 21 
 22 #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
 23 
 24 static inline void * __must_check ERR_PTR(long error)
 25 {
 26         return (void *) error;
 27 }
 28 
 29 static inline long __must_check PTR_ERR(__force const void *ptr)
 30 {
 31         return (long) ptr;
 32 }
 33 
 34 static inline bool __must_check IS_ERR(__force const void *ptr)
 35 {
 36         return IS_ERR_VALUE((unsigned long)ptr);
 37 }
 38 
 39 static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
 40 {
 41         return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
 42 }
 43 
 44 /**
 45  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
 46  * @ptr: The pointer to cast.
 47  *
 48  * Explicitly cast an error-valued pointer to another pointer type in such a
 49  * way as to make it clear that's what's going on.
 50  */
 51 static inline void * __must_check ERR_CAST(__force const void *ptr)
 52 {
 53         /* cast away the const */
 54         return (void *) ptr;
 55 }
 56 
 57 static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
 58 {
 59         if (IS_ERR(ptr))
 60                 return PTR_ERR(ptr);
 61         else
 62                 return 0;
 63 }
 64 
 65 /* Deprecated */
 66 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
 67 
 68 #endif
 69 
 70 #endif /* _LINUX_ERR_H */
 71 

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