1#ifndef FIO_ERR_H
2#define FIO_ERR_H
3
4/*
5 * Kernel pointers have redundant information, so we can use a
6 * scheme where we can return either an error code or a dentry
7 * pointer with the same return value.
8 *
9 * This should be a per-architecture thing, to allow different
10 * error and pointer decisions.
11 */
12#define MAX_ERRNO	4095
13
14#define IS_ERR_VALUE(x) ((x) >= (uintptr_t)-MAX_ERRNO)
15
16static inline void *ERR_PTR(uintptr_t error)
17{
18	return (void *) error;
19}
20
21static inline uintptr_t PTR_ERR(const void *ptr)
22{
23	return (uintptr_t) ptr;
24}
25
26static inline uintptr_t IS_ERR(const void *ptr)
27{
28	return IS_ERR_VALUE((uintptr_t)ptr);
29}
30
31static inline uintptr_t IS_ERR_OR_NULL(const void *ptr)
32{
33	return !ptr || IS_ERR_VALUE((uintptr_t)ptr);
34}
35
36static inline int PTR_ERR_OR_ZERO(const void *ptr)
37{
38	if (IS_ERR(ptr))
39		return PTR_ERR(ptr);
40	else
41		return 0;
42}
43
44#endif
45