datapath: Backport "openvswitch: allocate nr_node_ids flow_stats inst…

…ead of num_possible_nodes"

Upstream commit:
    openvswitch: allocate nr_node_ids flow_stats instead of num_possible_nodes

    Some architectures like POWER can have a NUMA node_possible_map that
    contains sparse entries. This causes memory corruption with openvswitch
    since it allocates flow_cache with a multiple of num_possible_nodes() and
    assumes the node variable returned by for_each_node will index into
    flow->stats[node].

    Use nr_node_ids to allocate a maximal sparse array instead of
    num_possible_nodes().

    The crash was noticed after 3af229f2 was applied as it changed the
    node_possible_map to match node_online_map on boot.
    Fixes: 3af229f2071f5b5cb31664be6109561fbe19c861

    Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
    Acked-by: Pravin B Shelar <pshelar@nicira.com>
    Acked-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Upstream: bac541e4631(""openvswitch: allocate nr_node_ids flow_stats
instead of num_possible_nodes")

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>

datapath/flow_table.c

@@ -988,7 +988,7 @@ int ovs_flow_init(void)
 	BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long));
 
 	flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow)
-				       + (num_possible_nodes()
+				       + (nr_node_ids
 					  * sizeof(struct flow_stats *)),
 				       0, 0, NULL);
 	if (flow_cache == NULL)