/*-
* Copyright (c) 2016-2017 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.
*
* $FreeBSD$
*/
#ifndef _LINUX_RCUPDATE_H_
#define _LINUX_RCUPDATE_H_
#include <linux/compiler.h>
#include <linux/types.h>
#include <machine/atomic.h>
#define LINUX_KFREE_RCU_OFFSET_MAX 4096 /* exclusive */
#define RCU_INITIALIZER(v) \
((typeof(*(v)) __force __rcu *)(v))
#define RCU_INIT_POINTER(p, v) do { \
(p) = (v); \
} while (0)
#define call_rcu(ptr, func) do { \
linux_call_rcu(ptr, func); \
} while (0)
#define rcu_barrier(void) do { \
linux_rcu_barrier(); \
} while (0)
#define rcu_read_lock(void) do { \
linux_rcu_read_lock(); \
} while (0)
#define rcu_read_unlock(void) do { \
linux_rcu_read_unlock(); \
} while (0)
#define synchronize_rcu(void) do { \
linux_synchronize_rcu(); \
} while (0)
#define synchronize_rcu_expedited(void) do { \
linux_synchronize_rcu(); \
} while (0)
#define kfree_rcu(ptr, rcu_head) do { \
CTASSERT(offsetof(__typeof(*(ptr)), rcu_head) < \
LINUX_KFREE_RCU_OFFSET_MAX); \
call_rcu(&(ptr)->rcu_head, (rcu_callback_t)(uintptr_t) \
offsetof(__typeof(*(ptr)), rcu_head)); \
} while (0)
#define rcu_access_pointer(p) \
((typeof(*p) __force __kernel *)(READ_ONCE(p)))
#define rcu_dereference_protected(p, c) \
((typeof(*p) __force __kernel *)(p))
#define rcu_dereference(p) \
rcu_dereference_protected(p, 0)
#define rcu_pointer_handoff(p) (p)
#define rcu_assign_pointer(p, v) do { \
atomic_store_rel_ptr((volatile uintptr_t *)&(p), \
(uintptr_t)(v)); \
} while (0)
/* prototypes */
extern void linux_call_rcu(struct rcu_head *ptr, rcu_callback_t func);
extern void linux_rcu_barrier(void);
extern void linux_rcu_read_lock(void);
extern void linux_rcu_read_unlock(void);
extern void linux_synchronize_rcu(void);
#endif /* _LINUX_RCUPDATE_H_ */
