Hi Alexander, Thank you for the patch! Yet something to improve: [auto build test ERROR on net/master] url: https://github.com/0day-ci/linux/commits/Alexander-Duyck/tcp-Mark-fastope... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git d9838b1d39283c1200c13f9076474c7624b8ec34 config: sh-allmodconfig (attached as .config) compiler: sh4-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://github.com/0day-ci/linux/commit/01abda6be2a196620ae2057c3e654edc8... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alexander-Duyck/tcp-Mark-fastopen-SYN-packet-as-lost-when-receiving-ICMP_TOOBIG-ICMP_FRAG_NEEDED/20201211-100032 git checkout 01abda6be2a196620ae2057c3e654edc82beb144 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh 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 >>, old ones prefixed by <<): ERROR: modpost: "clk_set_min_rate" [sound/soc/atmel/snd-soc-mchp-spdifrx.ko] undefined! ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org