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[PATCH] add hlist_replace_rcu()

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Add list_replace_rcu: replace old entry by new one.

Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2005-12-12 00:37:11 -08:00 • committed by Linus Torvalds
parent 5650b736ad
commit b88cb42428
1 changed files with 25 additions and 1 deletions
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26
include/linux/list.h
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@ -202,12 +202,15 @@ static inline void list_del_rcu(struct list_head *entry)
* *
* The old entry will be replaced with the new entry atomically. * The old entry will be replaced with the new entry atomically.
*/ */
static inline void list_replace_rcu(struct list_head *old, struct list_head *new){ static inline void list_replace_rcu(struct list_head *old,
struct list_head *new)
{
new->next = old->next; new->next = old->next;
new->prev = old->prev; new->prev = old->prev;
smp_wmb(); smp_wmb();
new->next->prev = new; new->next->prev = new;
new->prev->next = new; new->prev->next = new;
old->prev = LIST_POISON2;
} }
/** /**
@ -578,6 +581,27 @@ static inline void hlist_del_init(struct hlist_node *n)
} }
} }
/*
* hlist_replace_rcu - replace old entry by new one
* @old : the element to be replaced
* @new : the new element to insert
*
* The old entry will be replaced with the new entry atomically.
*/
static inline void hlist_replace_rcu(struct hlist_node *old,
struct hlist_node *new)
{
struct hlist_node *next = old->next;
new->next = next;
new->pprev = old->pprev;
smp_wmb();
if (next)
new->next->pprev = &new->next;
*new->pprev = new;
old->pprev = LIST_POISON2;
}
static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
{ {
struct hlist_node *first = h->first; struct hlist_node *first = h->first;