Hi Florian, I love your patch! Yet something to improve: [auto build test ERROR on kselftest/next] [also build test ERROR on mptcp/export linus/master v5.14-rc5 next-20210811] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Florian-Westphal/mptcp-add-SOL_M... base: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next config: i386-randconfig-a004-20210811 (attached as .config) 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/bd7031682bfb2cfd717fde49bd7f943c0... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Florian-Westphal/mptcp-add-SOL_MPTCP-getsockopt-support/20210811-212510 git checkout bd7031682bfb2cfd717fde49bd7f943c09f7a9a5 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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 >>): In file included from <command-line>:32: 205 | sa_family_t sa_family; | ^~~~~~~~~~~ 206 | struct sockaddr sa_local; | ^~~~~~~~ 208 | struct sockaddr_in6 sin6_local; | ^~~~~~~~~~ 209 | struct sockaddr_storage ss_local; | ^~~~~~~~ 212 | struct sockaddr sa_remote; | ^~~~~~~~~ 214 | struct sockaddr_in6 sin6_remote; | ^~~~~~~~~~~ 215 | struct sockaddr_storage ss_remote; | ^~~~~~~~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org