Hi Phil, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on nf-next/master] url: https://github.com/0day-ci/linux/commits/Phil-Sutter/netfilter-nf_tables-... base: https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master config: i386-randconfig-a012 (https://download.01.org/0day-ci/archive/20220216/202202160311.x0sGfQ8f-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/49585d5ef2f413b0bef6e50315e6b6c5b... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Phil-Sutter/netfilter-nf_tables-Reject-tables-of-unsupported-family/20220215-200808 git checkout 49585d5ef2f413b0bef6e50315e6b6c5bc85e475 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/netfilter/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): net/netfilter/nf_tables_api.c: In function 'nft_supported_family': 1096 | return true; | ^~~~ vim +1096 net/netfilter/nf_tables_api.c 1074 1075 static bool nft_supported_family(int family) 1076 { 1077 switch (family) { 1078 #ifdef CONFIG_NF_TABLES_INET 1079 case NFPROTO_INET: 1080 #endif 1081 #ifdef CONFIG_NF_TABLES_IPV4 1082 case NFPROTO_IPV4: 1083 #endif 1084 #ifdef CONFIG_NF_TABLES_ARP 1085 case NFPROTO_ARP: 1086 #endif 1087 #ifdef CONFIG_NF_TABLES_NETDEV 1088 case NFPROTO_NETDEV: 1089 #endif 1090 #if IS_ENABLED(CONIFG_NF_TABLES_BRIDGE) 1091 case NFPROTO_BRIDGE: 1092 #endif 1093 #ifdef CONFIG_NF_TABLES_IPV6 1094 case NFPROTO_IPV6: 1095 #endif 1097 default: 1098 return false; 1099 } 1100 } 1101 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org