linux-kernel - [PATCH -mm v2 2/3] slub: fix kmem_cache

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Date:	Wed, 28 Jan 2015 19:22:50 +0300
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH -mm v2 2/3] slub: fix kmem_cache_shrink return value

It is supposed to return 0 if the cache has no remaining objects and 1
otherwise, while currently it always returns 0. Fix it.

Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
 mm/slub.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index dbf9334b6a5c..63abe52c2951 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3379,6 +3379,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
 	LIST_HEAD(discard);
 	struct list_head promote[SHRINK_PROMOTE_MAX];
 	unsigned long flags;
+	int ret = 0;
 
 	for (i = 0; i < SHRINK_PROMOTE_MAX; i++)
 		INIT_LIST_HEAD(promote + i);
@@ -3419,6 +3420,9 @@ int __kmem_cache_shrink(struct kmem_cache *s)
 		for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--)
 			list_splice_init(promote + i, &n->partial);
 
+		if (n->nr_partial || slabs_node(s, node))
+			ret = 1;
+
 		spin_unlock_irqrestore(&n->list_lock, flags);
 
 		/* Release empty slabs */
@@ -3426,7 +3430,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
 			discard_slab(s, page);
 	}
 
-	return 0;
+	return ret;
 }
 
 static int slab_mem_going_offline_callback(void *arg)
-- 
1.7.10.4

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