1/*-
2 * Copyright (c) 2015-2020 Mellanox Technologies, Ltd.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef	_LINUXKPI_LINUX_SRCU_H_
28#define	_LINUXKPI_LINUX_SRCU_H_
29
30#include <linux/compiler.h>
31
32struct srcu_struct {
33};
34
35#define	srcu_dereference(p, srcu) \
36	((__typeof(*(p)) *)READ_ONCE(p))
37
38#define	DEFINE_STATIC_SRCU(name) \
39	static struct srcu_struct name
40
41/* prototypes */
42
43extern int srcu_read_lock(struct srcu_struct *);
44extern void srcu_read_unlock(struct srcu_struct *, int index);
45extern void synchronize_srcu(struct srcu_struct *);
46extern void srcu_barrier(struct srcu_struct *);
47extern int init_srcu_struct(struct srcu_struct *);
48extern void cleanup_srcu_struct(struct srcu_struct *);
49
50#define	synchronize_srcu_expedited(srcu) do {	\
51	synchronize_srcu(srcu);			\
52} while (0)
53
54#endif					/* _LINUXKPI_LINUX_SRCU_H_ */
55