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[PATCH 3/3] mm/slab: use list_{empty_careful,last_entry} in drain_freelist

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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@163.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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[PATCH 1/3] mm/slab: use list_first_entry_or_null() Geliang Tang <geliangtang@163.com> - 2015-12-02 16:50 +0100
  [PATCH 2/3] mm/slab: use list_for_each_entry in cache_flusharray Geliang Tang <geliangtang@163.com> - 2015-12-02 16:50 +0100
    Re: [PATCH 2/3] mm/slab: use list_for_each_entry in  cache_flusharray Christoph Lameter <cl@linux.com> - 2015-12-02 17:00 +0100
  [PATCH 3/3] mm/slab: use list_{empty_careful,last_entry} in drain_freelist Geliang Tang <geliangtang@163.com> - 2015-12-02 16:50 +0100
    Re: [PATCH 3/3] mm/slab: use list_{empty_careful,last_entry} in  drain_freelist Christoph Lameter <cl@linux.com> - 2015-12-02 17:10 +0100
      [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in drain_freelist Geliang Tang <geliangtang@163.com> - 2015-12-03 15:10 +0100
        Re: [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in  drain_freelist Christoph Lameter <cl@linux.com> - 2015-12-03 16:00 +0100
          Re: [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in  drain_freelist Geliang Tang <geliangtang@163.com> - 2015-12-04 14:50 +0100
            Re: [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in  drain_freelist Christoph Lameter <cl@linux.com> - 2015-12-04 17:20 +0100
              Re: [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in  drain_freelist Geliang Tang <geliangtang@163.com> - 2015-12-05 03:40 +0100
  Re: [PATCH 1/3] mm/slab: use list_first_entry_or_null() Christoph Lameter <cl@linux.com> - 2015-12-02 17:00 +0100

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