linux-kernel - [PATCH] mm/memcontrol.c: add memory allocation result check

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Message-Id: <1464597951-2976-1-git-send-email-wwtao0320@163.com>
Date:	Mon, 30 May 2016 16:45:51 +0800
From:	Wenwei Tao <wwtao0320@....com>
To:	hannes@...xchg.org, mhocko@...nel.org, vdavydov@...tuozzo.com
Cc:	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, ww.tao0320@...il.com
Subject: [PATCH] mm/memcontrol.c: add memory allocation result check

From: Wenwei Tao <ww.tao0320@...il.com>

The mem_cgroup_tree_per_node allocation might fail,
check that before continue the memcg init. Since it
is in the init phase, trigger the panic if that failure
happens.

Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
---
 mm/memcontrol.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 925b431..6385c62 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5712,6 +5712,7 @@ static int __init mem_cgroup_init(void)
 
 		rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
 				    node_online(node) ? node : NUMA_NO_NODE);
+		BUG_ON(!rtpn);
 
 		for (zone = 0; zone < MAX_NR_ZONES; zone++) {
 			struct mem_cgroup_tree_per_zone *rtpz;
-- 
1.8.3.1