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list_lru: don't call list_lru_from_kmem if the list_head is empty

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If the list_head is empty then we'll have called list_lru_from_kmem for
nothing.  Move that call inside of the list_empty if block.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Layton 2015-09-08 15:03:44 -07:00 committed by Linus Torvalds
parent 21cd3a6047
commit 26f5d7609f
1 changed files with 2 additions and 2 deletions
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4
mm/list_lru.c
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@ -99,8 +99,8 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item)
struct list_lru_one *l;
spin_lock(&nlru->lock);
l = list_lru_from_kmem(nlru, item);
if (list_empty(item)) {
l = list_lru_from_kmem(nlru, item);
list_add_tail(item, &l->list);
l->nr_items++;
spin_unlock(&nlru->lock);
@ -118,8 +118,8 @@ bool list_lru_del(struct list_lru *lru, struct list_head *item)
struct list_lru_one *l;
spin_lock(&nlru->lock);
l = list_lru_from_kmem(nlru, item);
if (!list_empty(item)) {
l = list_lru_from_kmem(nlru, item);
list_del_init(item);
l->nr_items--;
spin_unlock(&nlru->lock);