[PATCH net-next v3] datapath: Avoid using stack larger than 1024.

From: Tonghao Zhang When compiling OvS-master on 4.4.0-81 kernel, there is a warning: CC [M] /root/ovs/datapath/linux/datapath.o /root/ovs/datapath/linux/datapath.c: In function 'ovs_flow_cmd_set': /root/ovs/datapath/linux/datapath.c:1221:1: warning: the frame size of 1040 b

ovs internal_dev mtu

The upstream net-next has removed the “internal_dev_change_mtu”. It will be ok for ovs(e.g. mtu_request) ? I think that code should be keep. Can you provide more information ？