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[PATCH] list: use list_replace_init() instead of list_splice_init()

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list_splice_init(list, head) does unneeded job if it is known that
list_empty(head) == 1.  We can use list_replace_init() instead.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov
2006-06-23 02:05:55 -07:00
committed by Linus Torvalds
parent 54e7377035
commit 626ab0e69d
7 changed files with 19 additions and 21 deletions
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6
net/core/dev.c
View File

@ -2980,7 +2980,7 @@ static void netdev_wait_allrefs(struct net_device *dev)
static DEFINE_MUTEX(net_todo_run_mutex);
void netdev_run_todo(void)
{
struct list_head list = LIST_HEAD_INIT(list);
struct list_head list;
/* Need to guard against multiple cpu's getting out of order. */
mutex_lock(&net_todo_run_mutex);
@ -2995,9 +2995,9 @@ void netdev_run_todo(void)
/* Snapshot list, allow later requests */
spin_lock(&net_todo_list_lock);
list_splice_init(&net_todo_list, &list);
list_replace_init(&net_todo_list, &list);
spin_unlock(&net_todo_list_lock);
while (!list_empty(&list)) {
struct net_device *dev
= list_entry(list.next, struct net_device, todo_list);

5
net/core/link_watch.c
View File

@ -91,11 +91,10 @@ static void rfc2863_policy(struct net_device *dev)
/* Must be called with the rtnl semaphore held */
void linkwatch_run_queue(void)
{
LIST_HEAD(head);
struct list_head *n, *next;
struct list_head head, *n, *next;
spin_lock_irq(&lweventlist_lock);
list_splice_init(&lweventlist, &head);
list_replace_init(&lweventlist, &head);
spin_unlock_irq(&lweventlist_lock);
list_for_each_safe(n, next, &head) {