linux-kernel - [PATCH 3/3] mm/slab: use list_{empty_careful,last_entry} in drain

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Date:	Wed,  2 Dec 2015 23:46:13 +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 3/3] mm/slab: use list_{empty_careful,last_entry} in drain_freelist

To simplify the code, use list_empty_careful instead of list_empty.
To make the intention clearer, use list_last_entry instead of list_entry.

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 mm/slab.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 5d5aa3b..1a7d91c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2362,21 +2362,14 @@ 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;
 
 	nr_freed = 0;
-	while (nr_freed < tofree && !list_empty(&n->slabs_free)) {
+	while (nr_freed < tofree && !list_empty_careful(&n->slabs_free)) {
 
 		spin_lock_irq(&n->list_lock);
-		p = n->slabs_free.prev;
-		if (p == &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
@@ -2390,7 +2383,6 @@ static int drain_freelist(struct kmem_cache *cache,
 		slab_destroy(cache, page);
 		nr_freed++;
 	}
-out:
 	return nr_freed;
 }
 
-- 
2.5.0


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