From: KAMEZAWA Hiroyuki Date: Wed, 9 Apr 2008 00:41:54 +0000 (-0700) Subject: memcg: fix node_state handling X-Git-Tag: v2.6.25-rc9~42 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=41e3355de052693c7a0cad74b845148d262edadf;p=linux-2.6-omap-h63xx.git 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 Cc: Balbir Singh Cc: Pavel Emelyanov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 23b5fa4cabd..2e0bfc93484 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;