switchback       1208 net/ipv6/mcast.c 	unsigned long switchback;
switchback       1210 net/ipv6/mcast.c 	switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
switchback       1212 net/ipv6/mcast.c 	idev->mc_v1_seen = jiffies + switchback;