diff options
| author | riastradh <riastradh@NetBSD.org> | 2021-12-19 01:33:17 +0000 |
|---|---|---|
| committer | riastradh <riastradh@NetBSD.org> | 2021-12-19 01:33:17 +0000 |
| commit | decf3c7708ec68e13a5b167d6eecd41c72092dbe (patch) | |
| tree | 307298fda5328e6a2106d98a1eccdfa869ef1881 /sys/external/bsd/common/include/linux | |
| parent | 13103e48efea28257b06e91fbf300e0e4de4a2ec (diff) | |
Move Linux RCU to common.
Diffstat (limited to 'sys/external/bsd/common/include/linux')
| -rw-r--r-- | sys/external/bsd/common/include/linux/rcupdate.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/sys/external/bsd/common/include/linux/rcupdate.h b/sys/external/bsd/common/include/linux/rcupdate.h new file mode 100644 index 00000000000..2e8d6dfbd74 --- /dev/null +++ b/sys/external/bsd/common/include/linux/rcupdate.h @@ -0,0 +1,112 @@ +/* $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 <sys/atomic.h> +#include <sys/cdefs.h> +#include <sys/systm.h> + +#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_ */ |
