1/*-
2 * Copyright (c) 2022 Beckhoff Automation GmbH & Co. KG
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 */
26
27#ifndef _LINUXKPI_LINUX_MMAP_LOCK_H_
28#define	_LINUXKPI_LINUX_MMAP_LOCK_H_
29
30#include <linux/mm_types.h>
31#include <linux/rwsem.h>
32
33static inline void
34mmap_read_lock(struct mm_struct *mm)
35{
36
37	down_read(&mm->mmap_sem);
38}
39
40static inline void
41mmap_read_unlock(struct mm_struct *mm)
42{
43
44	up_read(&mm->mmap_sem);
45}
46
47static inline void
48mmap_write_lock_killable(struct mm_struct *mm)
49{
50
51	down_write_killable(&mm->mmap_sem);
52}
53
54#endif	/* _LINUXKPI_LINUX_MMAP_LOCK_H_ */
55