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>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 23b5fa4..2e0bfc9 100644 (file)
--- 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;