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/* $NetBSD: rcupdate.h,v 1.8 2021/12/19 11:49:11 riastradh Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* 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, 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#ifndef _LINUX_RCUPDATE_H_
#define _LINUX_RCUPDATE_H_
#include <sys/atomic.h>
#include <sys/cdefs.h>
#include <sys/systm.h>
#include <linux/bug.h>
#define __rcu
#define RCU_INIT_POINTER(P, V) ((P) = (V))
#define rcu_assign_pointer(P,V) atomic_store_release(&(P), (V))
#define rcu_dereference(P) atomic_load_consume(&(P))
#define rcu_access_pointer(P) atomic_load_relaxed(&(P))
#define rcu_dereference_raw rcu_dereference
#define rcu_dereference_protected(P, C) ({ \
WARN_ON(!(C)); \
(P); \
})
#define rcu_replace_pointer(PTRP, NEWPTR, C) ({ \
__typeof__(PTRP) __rrp_ptrp = (PTRP); \
__typeof__(PTRP) __rrp_oldptr = \
rcu_dereference_protected(__rrp_ptrp, C); \
rcu_assign_pointer(__rrp_ptrp, NEWPTR); \
__rrp_oldptr; \
})
/* kill_dependency */
#define rcu_pointer_handoff(P) (P)
struct rcu_head {
union {
void (*callback)(struct rcu_head *);
void *obj;
} rcuh_u;
struct rcu_head *rcuh_next;
};
#define _kfree_rcu linux__kfree_rcu
#define call_rcu linux_call_rcu
#define cond_synchronize_rcu linux_cond_synchronize_rcu
#define destroy_rcu_head linux_destroy_rcu_head
#define init_rcu_head linux_init_rcu_head
#define get_state_synchronize_rcu linux_get_state_synchronize_rcu
#define rcu_barrier linux_rcu_barrier
#define synchronize_rcu linux_synchronize_rcu
#define synchronize_rcu_expedited linux_synchronize_rcu_expedited
int linux_rcu_gc_init(void);
void linux_rcu_gc_fini(void);
void init_rcu_head(struct rcu_head *);
void destroy_rcu_head(struct rcu_head *);
void call_rcu(struct rcu_head *, void (*)(struct rcu_head *));
void rcu_barrier(void);
void synchronize_rcu(void);
void synchronize_rcu_expedited(void);
unsigned long get_state_synchronize_rcu(void);
void cond_synchronize_rcu(unsigned long);
void _kfree_rcu(struct rcu_head *, void *);
static inline void
rcu_read_lock(void)
{
kpreempt_disable(); /* implies __insn_barrier */
}
static inline void
rcu_read_unlock(void)
{
kpreempt_enable(); /* implies __insn_barrier */
}
#define kfree_rcu(P, F) \
_kfree_rcu(&(P)->F, (P))
#endif /* _LINUX_RCUPDATE_H_ */
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