xref: /freebsd-11-stable/sys/compat/linuxkpi/common/include/linux/srcu.h

/*-
 * Copyright (c) 2015-2020 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/srcu.h 361924 2020-06-08 09:39:16Z hselasky $
 */

#ifndef	_LINUX_SRCU_H_
#define	_LINUX_SRCU_H_

#include <linux/compiler.h>

struct srcu_struct {
};

#define	srcu_dereference(p, srcu) \
	((__typeof(*(p)) *)READ_ONCE(p))

#define	DEFINE_STATIC_SRCU(name) \
	static struct srcu_struct name

/* prototypes */

extern int srcu_read_lock(struct srcu_struct *);
extern void srcu_read_unlock(struct srcu_struct *, int index);
extern void synchronize_srcu(struct srcu_struct *);
extern void srcu_barrier(struct srcu_struct *);
extern int init_srcu_struct(struct srcu_struct *);
extern void cleanup_srcu_struct(struct srcu_struct *);

#define	synchronize_srcu_expedited(srcu) do {	\
	synchronize_srcu(srcu);			\
} while (0)

#endif					/* _LINUX_SRCU_H_ */