Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/xiangxia-m-yue-gmail-com/optimize-openvswitch-flow-looking-up/20191013-161404
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-rc1-43-g0ccb3b4-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> net/openvswitch/flow_table.c:307:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@    expected struct callback_head *head @@    got struct callback_hestruct callback_head *head @@
>> net/openvswitch/flow_table.c:307:9: sparse:    expected struct callback_head *head
>> net/openvswitch/flow_table.c:307:9: sparse:    got struct callback_head [noderef] <asn:4> *

vim +307 net/openvswitch/flow_table.c

   297	
   298	/* No need for locking this function is called from RCU callback or
   299	 * error path.
   300	 */
   301	void ovs_flow_tbl_destroy(struct flow_table *table)
   302	{
   303		struct table_instance *ti = rcu_dereference_raw(table->ti);
   304		struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
   305	
   306		free_percpu(table->mask_cache);
 > 307		kfree_rcu(table->mask_array, rcu);
   308		table_instance_destroy(ti, ufid_ti, false);
   309	}
   310	

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