linux-kernel - [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in drain

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Message-Id: <3ea815dc52bf1a2bb5e324d7398315597900be84.1449151365.git.geliangtang@163.com>
Date:	Thu,  3 Dec 2015 22:07:46 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Geliang Tang <geliangtang@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in drain_freelist

To make the intention clearer, use list_empty_careful and list_last_entry
in drain_freelist().

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 mm/slab.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 5d5aa3b..925921e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2362,7 +2362,6 @@ static void drain_cpu_caches(struct kmem_cache *cachep)
 static int drain_freelist(struct kmem_cache *cache,
 			struct kmem_cache_node *n, int tofree)
 {
-	struct list_head *p;
 	int nr_freed;
 	struct page *page;
 
@@ -2370,13 +2369,12 @@ static int drain_freelist(struct kmem_cache *cache,
 	while (nr_freed < tofree && !list_empty(&n->slabs_free)) {
 
 		spin_lock_irq(&n->list_lock);
-		p = n->slabs_free.prev;
-		if (p == &n->slabs_free) {
+		if (list_empty_careful(&n->slabs_free)) {
 			spin_unlock_irq(&n->list_lock);
 			goto out;
 		}
 
-		page = list_entry(p, struct page, lru);
+		page = list_last_entry(&n->slabs_free, struct page, lru);
 #if DEBUG
 		BUG_ON(page->active);
 #endif
-- 
2.5.0


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