openvswitch: Move mega-flow list out of rehashing struct.

ovs-flow rehash does not touch mega flow list. Following patch
moves it dp struct datapath.  Avoid one extra indirection for
accessing mega-flow list head on every packet receive.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index a6982ef..acfd4af 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -58,12 +58,11 @@
  * struct datapath - datapath for flow-based packet switching
  * @rcu: RCU callback head for deferred destruction.
  * @list_node: Element in global 'dps' list.
- * @table: Current flow table.  Protected by ovs_mutex and RCU.
+ * @table: flow table.
  * @ports: Hash table for ports.  %OVSP_LOCAL port always exists.  Protected by
  * ovs_mutex and RCU.
  * @stats_percpu: Per-CPU datapath statistics.
  * @net: Reference to net namespace.
- * @last_rehash: Timestamp of last rehash.
  *
  * Context: See the comment on locking at the top of datapath.c for additional
  * locking information.
@@ -73,7 +72,7 @@
 	struct list_head list_node;
 
 	/* Flow table. */
-	struct flow_table __rcu *table;
+	struct flow_table table;
 
 	/* Switch ports. */
 	struct hlist_head *ports;
@@ -85,7 +84,6 @@
 	/* Network namespace ref. */
 	struct net *net;
 #endif
-	unsigned long last_rehash;
 };
 
 /**