tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fc80c51fd4b23ec007e88d4c688f2cac1b8648e7 commit: e10dcb1b6ba714243ad5a35a11b91cc14103a9a9 net: cdc_ncm: hook into set_rx_mode to admit multicast traffic date: 3 weeks ago config: microblaze-randconfig-r025-20200810 (attached as .config) compiler: microblaze-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 git checkout e10dcb1b6ba714243ad5a35a11b91cc14103a9a9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 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 >>): microblaze-linux-ld: drivers/net/usb/cdc_ncm.o:(.rodata+0x70c): undefined reference to `usbnet_cdc_update_filter' microblaze-linux-ld: drivers/net/usb/cdc_ncm.o:(.rodata+0x760): undefined reference to `usbnet_cdc_update_filter' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org