Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_ERR_H
2#define _LINUX_ERR_H
3
4#include <linux/compiler.h>
5
6#include <asm/errno.h>
7
8/*
9 * Kernel pointers have redundant information, so we can use a
10 * scheme where we can return either an error code or a dentry
11 * pointer with the same return value.
12 *
13 * This should be a per-architecture thing, to allow different
14 * error and pointer decisions.
15 */
16#define MAX_ERRNO 4095
17
18#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
19
20static inline void *ERR_PTR(long error)
21{
22 return (void *) error;
23}
24
25static inline long PTR_ERR(const void *ptr)
26{
27 return (long) ptr;
28}
29
30static inline long IS_ERR(const void *ptr)
31{
32 return IS_ERR_VALUE((unsigned long)ptr);
33}
34
35#endif /* _LINUX_ERR_H */