IP_TUNNEL_CRIT_OPT_BIT
geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT,
geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT,
__assign_bit(IP_TUNNEL_CRIT_OPT_BIT, flags, gnvh->critical);
if (test_bit(IP_TUNNEL_CRIT_OPT_BIT, key->tun_flags))
__set_bit(IP_TUNNEL_CRIT_OPT_BIT, key->tun_key.tun_flags);