6425fed7e6
- Add rcu list functions. - Make rcu hlist's foreach macro use rcu calls instead of the non-rcu macro. - Bump FreeBSD version so we have a checkpoint for the vboxvideo drm driver. Reviewed by: hps Approved by: imp (mentor), hps MFC after: 1 week Differential Revision: D20719
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/*-
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* Copyright (c) 2015 François Tigeot
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* Copyright (c) 2016-2017 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_RCULIST_H_
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#define _LINUX_RCULIST_H_
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#include <linux/list.h>
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#include <linux/rcupdate.h>
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#define list_entry_rcu(ptr, type, member) \
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container_of(READ_ONCE(ptr), type, member)
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#define list_next_rcu(head) (*((struct list_head **)(&(head)->next)))
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#define list_for_each_entry_rcu(pos, head, member) \
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for (pos = list_entry_rcu((head)->next, typeof(*(pos)), member); \
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&(pos)->member != (head); \
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pos = list_entry_rcu((pos)->member.next, typeof(*(pos)), member))
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static inline void
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list_add_rcu(struct list_head *new, struct list_head *prev)
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{
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new->next = prev->next;
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new->prev = prev;
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rcu_assign_pointer(list_next_rcu(prev), new);
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prev->prev = new;
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}
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#define hlist_first_rcu(head) (*((struct hlist_node **)(&(head)->first)))
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#define hlist_next_rcu(node) (*((struct hlist_node **)(&(node)->next)))
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#define hlist_pprev_rcu(node) (*((struct hlist_node **)((node)->pprev)))
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static inline void
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hlist_add_behind_rcu(struct hlist_node *n, struct hlist_node *prev)
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{
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n->next = prev->next;
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n->pprev = &prev->next;
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rcu_assign_pointer(hlist_next_rcu(prev), n);
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if (n->next)
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n->next->pprev = &n->next;
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}
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#define hlist_for_each_entry_rcu(pos, head, member) \
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for (pos = hlist_entry_safe (rcu_dereference_raw(hlist_first_rcu(head)),\
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typeof(*(pos)), member); \
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(pos); \
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pos = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu( \
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&(pos)->member)), typeof(*(pos)), member))
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static inline void
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hlist_del_rcu(struct hlist_node *n)
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{
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struct hlist_node *next = n->next;
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struct hlist_node **pprev = n->pprev;
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WRITE_ONCE(*pprev, next);
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if (next)
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next->pprev = pprev;
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}
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static inline void
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hlist_add_head_rcu(struct hlist_node *n, struct hlist_head *h)
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{
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struct hlist_node *first = h->first;
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n->next = first;
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n->pprev = &h->first;
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rcu_assign_pointer(hlist_first_rcu(h), n);
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if (first)
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first->pprev = &n->next;
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}
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static inline void
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hlist_del_init_rcu(struct hlist_node *n)
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{
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if (!hlist_unhashed(n)) {
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hlist_del_rcu(n);
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n->pprev = NULL;
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}
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}
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#endif /* _LINUX_RCULIST_H_ */
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