memcg: fix node_state handling

This should be N_NORMAL_MEMORY.

N_NORMAL_MEMORY is "true" if a node has memory for the kernel.  N_HIGH_MEMORY
is "true" if a node has memory for HIGHMEM.  (If CONFIG_HIGHMEM=n, always
"true")

This check is used for testing whether we can use kmalloc_node() on a node.
Then, if there is a node which only contains HIGHMEM, the system will call
kmalloc_node() which doesn't contain memory for the kernel.  If it happens
under SLUB, the kernel will panic.  I think this only happens on x86_32-numa.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 23b5fa4cabd8..2e0bfc93484b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -978,7 +978,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
 {
         struct mem_cgroup_per_node *pn;
         struct mem_cgroup_per_zone *mz;
-        int zone;
+        int zone, tmp = node;
         /*
          * This routine is called against possible nodes.
          * But it's BUG to call kmalloc() against offline node.
@@ -987,10 +987,9 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
          *       never be onlined. It's better to use memory hotplug callback
          *       function.
          */
-        if (node_state(node, N_HIGH_MEMORY))
-                pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
-        else
-                pn = kmalloc(sizeof(*pn), GFP_KERNEL);
+        if (!node_state(node, N_NORMAL_MEMORY))
+                tmp = -1;
+        pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp);
         if (!pn)
                 return 1;