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;