c7c96d1093
- Add some new hlist macros. - Update existing hlist macros removing the need for a temporary iteration variable. - Properly define the RCU hlist macros to be SMP safe with regard to RCU. - Safe list macro arguments by adding a pair of parentheses. - Prefix the _list_add() and _list_splice() functions with "linux" to reflect they are LinuxKPI internal functions. Obtained from: Linux MFC after: 1 week Sponsored by: Mellanox Technologies
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*-
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* Copyright (c) 2016 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_RCUPDATE_H_
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#define _LINUX_RCUPDATE_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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extern struct sx linux_global_rcu_lock;
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struct rcu_head {
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};
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typedef void (*rcu_callback_t)(struct rcu_head *);
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static inline void
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call_rcu(struct rcu_head *ptr, rcu_callback_t func)
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{
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sx_xlock(&linux_global_rcu_lock);
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func(ptr);
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sx_xunlock(&linux_global_rcu_lock);
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}
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static inline void
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rcu_read_lock(void)
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{
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sx_slock(&linux_global_rcu_lock);
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}
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static inline void
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rcu_read_unlock(void)
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{
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sx_sunlock(&linux_global_rcu_lock);
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}
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static inline void
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rcu_barrier(void)
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{
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sx_xlock(&linux_global_rcu_lock);
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sx_xunlock(&linux_global_rcu_lock);
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}
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static inline void
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synchronize_rcu(void)
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{
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sx_xlock(&linux_global_rcu_lock);
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sx_xunlock(&linux_global_rcu_lock);
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}
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#define hlist_add_head_rcu(n, h) \
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do { \
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sx_xlock(&linux_global_rcu_lock); \
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hlist_add_head(n, h); \
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sx_xunlock(&linux_global_rcu_lock); \
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} while (0)
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#define hlist_del_init_rcu(n) \
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do { \
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sx_xlock(&linux_global_rcu_lock); \
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hlist_del_init(n); \
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sx_xunlock(&linux_global_rcu_lock); \
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} while (0)
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#define hlist_del_rcu(n) \
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do { \
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sx_xlock(&linux_global_rcu_lock); \
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hlist_del(n); \
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sx_xunlock(&linux_global_rcu_lock); \
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} while (0)
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#endif /* _LINUX_RCUPDATE_H_ */
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