dev_hr            561 net/bridge/br_if.c 	unsigned br_hr, dev_hr;
dev_hr            642 net/bridge/br_if.c 	dev_hr = netdev_get_fwd_headroom(dev);
dev_hr            643 net/bridge/br_if.c 	if (br_hr < dev_hr)
dev_hr            644 net/bridge/br_if.c 		update_headroom(br, dev_hr);