/* $NetBSD: rcupdate.h,v 1.1 2021/12/19 01:33:17 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 #include #include #define __rcu #define RCU_INIT_POINTER(P, V) ((P) = (V)) #define rcu_assign_pointer(P, V) do { \ __typeof__(*(P)) *__rcu_assign_pointer_tmp = (V); \ membar_exit(); \ (P) = __rcu_assign_pointer_tmp; \ } while (0) #define rcu_dereference(P) ({ \ __typeof__(*(P)) *__rcu_dereference_tmp = (P); \ membar_datadep_consumer(); \ __rcu_dereference_tmp; \ }) #define rcu_dereference_raw rcu_dereference #define rcu_dereference_protected(P, C) ({ \ WARN_ON(!(C)); \ (P); \ }) #define rcu_access_pointer(P) ({ \ __typeof__(*(P)) *__rcu_access_pointer_tmp = (P); \ __insn_barrier(); \ __rcu_access_pointer_tmp; \ }) /* 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 rcu_barrier linux_rcu_barrier #define synchronize_rcu linux_synchronize_rcu int linux_rcu_gc_init(void); void linux_rcu_gc_fini(void); void call_rcu(struct rcu_head *, void (*)(struct rcu_head *)); void rcu_barrier(void); void synchronize_rcu(void); void _kfree_rcu(struct rcu_head *, void *); static inline void rcu_read_lock(void) { kpreempt_disable(); __insn_barrier(); } static inline void rcu_read_unlock(void) { __insn_barrier(); kpreempt_enable(); } #define kfree_rcu(P, F) \ _kfree_rcu(&(P)->F, (P)) #endif /* _LINUX_RCUPDATE_H_ */