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
33 static inline void
mmap_read_lock(struct mm_struct * mm)34 mmap_read_lock(struct mm_struct *mm)
35 {
36
37 down_read(&mm->mmap_sem);
38 }
39
40 static inline void
mmap_read_unlock(struct mm_struct * mm)41 mmap_read_unlock(struct mm_struct *mm)
42 {
43
44 up_read(&mm->mmap_sem);
45 }
46
47 static inline void
mmap_write_lock_killable(struct mm_struct * mm)48 mmap_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