tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master head: ea89c862f01e02ec459932c7c3113fa37aedd09a commit: a3c02e769efe66dce5e2c716862b60c8d44d191e [44/65] net: bridge: mcast: split multicast router state for IPv4 and IPv6 config: m68k-randconfig-r006-20210514 (attached as .config) compiler: m68k-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 # https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit... git remote add net-next https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git git fetch --no-tags net-next master git checkout a3c02e769efe66dce5e2c716862b60c8d44d191e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): net/bridge/br_multicast.c: In function '__br_multicast_enable_port': 1743 | br_ip6_multicast_add_router(br, port); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ | br_ip4_multicast_add_router net/bridge/br_multicast.c: At top level: 2804 | static void br_ip6_multicast_add_router(struct net_bridge *br, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ net/bridge/br_multicast.c:1743:3: note: previous implicit declaration of 'br_ip6_multicast_add_router' was here 1743 | br_ip6_multicast_add_router(br, port); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +1743 net/bridge/br_multicast.c 1729 1730 static void __br_multicast_enable_port(struct net_bridge_port *port) 1731 { 1732 struct net_bridge *br = port->br; 1733 1734 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev)) 1735 return; 1736 1737 br_multicast_enable(&port->ip4_own_query); 1738 #if IS_ENABLED(CONFIG_IPV6) 1739 br_multicast_enable(&port->ip6_own_query); 1740 #endif 1741 if (port->multicast_router == MDB_RTR_TYPE_PERM) { 1742 br_ip4_multicast_add_router(br, port); 1744 } 1745 } 1746 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org