Hi Vladimir, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Vladimir-Oltean/Offload-learnt-b... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git c9448e828d113cd7eafe77c414127e877ca88b20 config: x86_64-randconfig-a013-20201116 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c044709b8fbea2a9a375e4173a6bd735f6866c0c) 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 # https://github.com/0day-ci/linux/commit/307255d137629e3c55903902af882231d... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Vladimir-Oltean/Offload-learnt-bridge-addresses-to-DSA/20201109-090521 git checkout 307255d137629e3c55903902af882231d1b5cb56 # 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 warnings (new ones prefixed by >>): struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev) ^ net/dsa/slave.c:2134:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct dsa_slave_priv *dsa_slave_dev_lower_find(struct net_device *dev) ^ static 1 warning generated. vim +/dsa_slave_dev_lower_find +2134 net/dsa/slave.c 2133 2135 { 2136 struct netdev_nested_priv priv = { 2137 .data = NULL, 2138 }; 2139 2140 netdev_walk_all_lower_dev_rcu(dev, dsa_lower_dev_walk, &priv); 2141 2142 return priv.data; 2143 } 2144 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org