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authorOleg Nesterov <oleg@tv-sign.ru>2006-06-23 02:05:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 07:43:07 -0700
commit54e73770357142e297c916c7865f5fca7499f69c (patch)
treea37b768005eee1fdf6e0ae3051098c51f918785f /include/linux
parentcb259f07b1daacafac3b12ecd7f180faf7e506b0 (diff)
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[PATCH] list: introduce list_replace() helper
list_replace() is similar to list_replace_rcu(), but unlike list_replace_rcu() it could be used when list_empty(old) == 1 doesn't use barriers Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/list.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h
index 76f0571..a02642e 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -197,12 +197,35 @@ static inline void list_del_rcu(struct list_head *entry)
entry->prev = LIST_POISON2;
}
+/**
+ * list_replace - replace old entry by new one
+ * @old : the element to be replaced
+ * @new : the new element to insert
+ * Note: if 'old' was empty, it will be overwritten.
+ */
+static inline void list_replace(struct list_head *old,
+ struct list_head *new)
+{
+ new->next = old->next;
+ new->next->prev = new;
+ new->prev = old->prev;
+ new->prev->next = new;
+}
+
+static inline void list_replace_init(struct list_head *old,
+ struct list_head *new)
+{
+ list_replace(old, new);
+ INIT_LIST_HEAD(old);
+}
+
/*
* list_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.
+ * Note: 'old' should not be empty.
*/
static inline void list_replace_rcu(struct list_head *old,
struct list_head *new)
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