Hi Paolo, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mptcp/export] [cannot apply to shuah-kselftest/next linus/master v5.16-rc2 next-20211124] [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/Paolo-Abeni/mptcp-improve-subflo... base: https://github.com/multipath-tcp/mptcp_net-next.git export config: i386-randconfig-a002-20211124 (https://download.01.org/0day-ci/archive/20211125/202111251042.JLoJ33k0-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 67a1c45def8a75061203461ab0060c75c864df1c) 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/6af8e28040c093866aa60ede3f980b53a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Paolo-Abeni/mptcp-improve-subflow-creation-on-errors/20211125-005137 git checkout 6af8e28040c093866aa60ede3f980b53ab3594a5 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 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 >>): void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id) ^ net/mptcp/pm.c:203:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id) ^ static 1 warning generated. vim +/mptcp_pm_subflow_closed +203 net/mptcp/pm.c 6af8e28040c0938 Paolo Abeni 2021-11-24 202 1b1c7a0ef7f323f Peter Krystad 2020-03-27 @203 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id) 1b1c7a0ef7f323f Peter Krystad 2020-03-27 204 { 1b1c7a0ef7f323f Peter Krystad 2020-03-27 205 pr_debug("msk=%p", msk); 1b1c7a0ef7f323f Peter Krystad 2020-03-27 206 } 1b1c7a0ef7f323f Peter Krystad 2020-03-27 207 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org