Hi Phil, Thank you for the patch! Yet something to improve: [auto build test ERROR on nf-next/master] url: https://github.com/0day-ci/linux/commits/Phil-Sutter/netfilter-include-ua... base: https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master config: x86_64-allyesconfig (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 3504acc33e8b9ddd7de71d75cdc329a14dbf58d9) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): In file included from <built-in>:1: char data[] __aligned(__alignof__(struct ebt_replace)); ^ ; ./usr/include/linux/netfilter_bridge/ebtables.h:132:22: error: expected ';' at end of declaration list unsigned char data[] __aligned(__alignof__(struct ebt_replace)); ^ ; ./usr/include/linux/netfilter_bridge/ebtables.h:145:22: error: expected ';' at end of declaration list unsigned char data[] __aligned(__alignof__(struct ebt_replace)); ^ ; ./usr/include/linux/netfilter_bridge/ebtables.h:158:22: error: expected ';' at end of declaration list unsigned char data[] __aligned(__alignof__(struct ebt_replace)); ^ ; struct ebt_entry_target target; ^ ./usr/include/linux/netfilter_bridge/ebtables.h:191:23: error: expected ';' at end of declaration list unsigned char elems[] __aligned(__alignof__(struct ebt_replace)); ^ ; 1 warning and 5 errors generated. -- In file included from <built-in>:1: In file included from ./usr/include/linux/netfilter_ipv6/ip6_tables.h:24: struct xt_entry_target target; ^ ./usr/include/linux/netfilter/x_tables.h:71:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct xt_entry_target target; ^ In file included from <built-in>:1: struct ip6t_entry entry; ^ ./usr/include/linux/netfilter_ipv6/ip6_tables.h:136:20: warning: field 'entry' with variable sized type 'struct ip6t_entry' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct ip6t_entry entry; ^ 4 warnings generated. -- In file included from <built-in>:1: In file included from ./usr/include/linux/netfilter_arp/arpt_mangle.h:4: In file included from ./usr/include/linux/netfilter_arp/arp_tables.h:18: struct xt_entry_target target; ^ ./usr/include/linux/netfilter/x_tables.h:71:25: warning: field 'target' with variable sized type 'struct xt_entry_target' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct xt_entry_target target; ^ 2 warnings generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org