linux-kernel - [PATCH 4.2 14/54] ovs: do not allocate memory from offline numa node

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Date:	Fri, 23 Oct 2015 10:44:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Pravin B Shelar <pshelar@...ira.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.2 14/54] ovs: do not allocate memory from offline numa node

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Konstantin Khlebnikov <khlebnikov@...dex-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@...dex-team.ru>
Acked-by: Pravin B Shelar <pshelar@...ira.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 


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