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