Hi Jian, Thank you for the patch! Yet something to improve: [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Jian-Yang/net-loopback-allow-lo-... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 70408949a35f1a31c327c69b6a187635cb0305fa config: powerpc64-randconfig-r006-20201116 (attached as .config) compiler: powerpc-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/f1167177eeca028a046726f582c332d4c... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jian-Yang/net-loopback-allow-lo-dev-initial-state-to-be-controlled/20201112-044539 git checkout f1167177eeca028a046726f582c332d4c638a0c8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64 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 >>): powerpc-linux-ld: drivers/net/loopback.o: in function `loopback_net_init': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org