Hi Xin, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b6c093e21d36bede0fd88fd0aeb3b03647260e4 commit: 5a6f6f579178dbeb33002d93b4f646c31348fac9 tipc: set ub->ifindex for local ipv6 address date: 11 days ago config: parisc-randconfig-r032-20200816 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 5a6f6f579178dbeb33002d93b4f646c31348fac9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): hppa-linux-ld: net/tipc/udp_media.o: in function `tipc_udp_enable': >> net/tipc/udp_media.c:743: undefined reference to `ipv6_dev_find' vim +743 net/tipc/udp_media.c 642 643 /** 644 * tipc_udp_enable - callback to create a new udp bearer instance 645 * @net: network namespace 646 * @b: pointer to generic tipc_bearer 647 * @attrs: netlink bearer configuration 648 * 649 * validate the bearer parameters and initialize the udp bearer 650 * rtnl_lock should be held 651 */ 652 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 653 struct nlattr *attrs[]) 654 { 655 int err = -EINVAL; 656 struct udp_bearer *ub; 657 struct udp_media_addr remote = {0}; 658 struct udp_media_addr local = {0}; 659 struct udp_port_cfg udp_conf = {0}; 660 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 661 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 662 u8 node_id[NODE_ID_LEN] = {0,}; 663 int rmcast = 0; 664 665 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 666 if (!ub) 667 return -ENOMEM; 668 669 INIT_LIST_HEAD(&ub->rcast.list); 670 671 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 672 goto err; 673 674 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 675 goto err; 676 677 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 678 pr_err("Invalid UDP bearer configuration"); 679 err = -EINVAL; 680 goto err; 681 } 682 683 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 684 &ub->ifindex); 685 if (err) 686 goto err; 687 688 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 689 if (err) 690 goto err; 691 692 if (remote.proto != local.proto) { 693 err = -EINVAL; 694 goto err; 695 } 696 697 /* Checking remote ip address */ 698 rmcast = tipc_udp_is_mcast_addr(&remote); 699 700 /* Autoconfigure own node identity if needed */ 701 if (!tipc_own_id(net)) { 702 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 703 tipc_net_init(net, node_id, 0); 704 } 705 if (!tipc_own_id(net)) { 706 pr_warn("Failed to set node id, please configure manually\n"); 707 err = -EINVAL; 708 goto err; 709 } 710 711 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 712 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 713 rcu_assign_pointer(b->media_ptr, ub); 714 rcu_assign_pointer(ub->bearer, b); 715 tipc_udp_media_addr_set(&b->addr, &local); 716 if (local.proto == htons(ETH_P_IP)) { 717 struct net_device *dev; 718 719 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 720 if (!dev) { 721 err = -ENODEV; 722 goto err; 723 } 724 udp_conf.family = AF_INET; 725 726 /* Switch to use ANY to receive packets from group */ 727 if (rmcast) 728 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 729 else 730 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 731 udp_conf.use_udp_checksums = false; 732 ub->ifindex = dev->ifindex; 733 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 734 sizeof(struct udphdr))) { 735 err = -EINVAL; 736 goto err; 737 } 738 b->mtu = b->media->mtu; 739 #if IS_ENABLED(CONFIG_IPV6) 740 } else if (local.proto == htons(ETH_P_IPV6)) { 741 struct net_device *dev; 742 > 743 dev = ipv6_dev_find(net, &local.ipv6); 744 if (!dev) { 745 err = -ENODEV; 746 goto err; 747 } 748 udp_conf.family = AF_INET6; 749 udp_conf.use_udp6_tx_checksums = true; 750 udp_conf.use_udp6_rx_checksums = true; 751 if (rmcast) 752 udp_conf.local_ip6 = in6addr_any; 753 else 754 udp_conf.local_ip6 = local.ipv6; 755 ub->ifindex = dev->ifindex; 756 b->mtu = 1280; 757 #endif 758 } else { 759 err = -EAFNOSUPPORT; 760 goto err; 761 } 762 udp_conf.local_udp_port = local.port; 763 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 764 if (err) 765 goto err; 766 tuncfg.sk_user_data = ub; 767 tuncfg.encap_type = 1; 768 tuncfg.encap_rcv = tipc_udp_recv; 769 tuncfg.encap_destroy = NULL; 770 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 771 772 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); 773 if (err) 774 goto free; 775 776 /** 777 * The bcast media address port is used for all peers and the ip 778 * is used if it's a multicast address. 779 */ 780 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 781 if (rmcast) 782 err = enable_mcast(ub, &remote); 783 else 784 err = tipc_udp_rcast_add(b, &remote); 785 if (err) 786 goto free; 787 788 return 0; 789 790 free: 791 dst_cache_destroy(&ub->rcast.dst_cache); 792 udp_tunnel_sock_release(ub->ubsock); 793 err: 794 kfree(ub); 795 return err; 796 } 797 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org