linux-kernel - [PATCH] list_lru: don't call list_lru_from_kmem if the list

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Message-Id: <1439993140-13362-1-git-send-email-jeff.layton@primarydata.com>
Date:	Wed, 19 Aug 2015 10:05:40 -0400
From:	Jeff Layton <jlayton@...chiereds.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] list_lru: don't call list_lru_from_kmem if the list_head is empty

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.

Cc: Vladimir Davydov <vdavydov@...allels.com>
Signed-off-by: Jeff Layton <jeff.layton@...marydata.com>
---
 mm/list_lru.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/list_lru.c b/mm/list_lru.c
index 909eca2c820e..e1da19fac1b3 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -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);
-- 
2.4.3

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