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

[Wenwei Tao]

From: Wenwei Tao <ww.tao0...@gmail.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.tao0...@gmail.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