Patch "ovs: do not allocate memory from offline numa node" has been added to the 4.2-stable tree

Patch "ovs: do not allocate memory from offline numa node" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ovs: do not allocate memory from offline numa node

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ovs-do-not-allocate-memory-from-offline-numa-node.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct 22 17:25:24 PDT 2015
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Fri, 2 Oct 2015 13:18:22 +0300
Subject: ovs: do not allocate memory from offline numa node

From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

[ Upstream commit 598c12d0ba6de9060f04999746eb1e015774044b ]

When openvswitch tries allocate memory from offline numa node 0:
stats = kmem_cache_alloc_node(flow_stats_cache, GFP_KERNEL | __GFP_ZERO, 0)
It catches VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid))
[ replaced with VM_WARN_ON(!node_online(nid)) recently ] in linux/gfp.h
This patch disables numa affinity in this case.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/openvswitch/flow_table.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -92,7 +92,8 @@ struct sw_flow *ovs_flow_alloc(void)
 
 	/* Initialize the default stat node. */
 	stats = kmem_cache_alloc_node(flow_stats_cache,
-				      GFP_KERNEL | __GFP_ZERO, 0);
+				      GFP_KERNEL | __GFP_ZERO,
+				      node_online(0) ? 0 : NUMA_NO_NODE);
 	if (!stats)
 		goto err;
 


Patches currently in stable-queue which might be from khlebnikov@yandex-team.ru are

queue-4.2/ovs-do-not-allocate-memory-from-offline-numa-node.patch