1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/*
* Adopted from linux kernel
*/
#ifndef __CR_COMMON_ERR_H__
#define __CR_COMMON_ERR_H__
#include "common/compiler.h"
/*
* The address of a block returned by malloc or realloc in GNU
* systems is always a multiple of eight (or sixteen on 64-bit systems).
*
* Thus we may encode error number in low bits.
*/
#define MAX_ERRNO 4095
#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
static inline void *ERR_PTR(long error)
{
return (void *)error;
}
static inline long PTR_ERR(const void *ptr)
{
return (long)ptr;
}
static inline long IS_ERR(const void *ptr)
{
return IS_ERR_VALUE((unsigned long)ptr);
}
static inline long IS_ERR_OR_NULL(const void *ptr)
{
return !ptr || IS_ERR_VALUE((unsigned long)ptr);
}
static inline void *ERR_CAST(const void *ptr)
{
/* cast away the const */
return (void *)ptr;
}
static inline int PTR_RET(const void *ptr)
{
if (IS_ERR(ptr))
return PTR_ERR(ptr);
else
return 0;
}
#endif /* __CR_ERR_H__ */
|
