Hi "Uwe, I love your patch! Yet something to improve: [auto build test ERROR on e73f0f0ee7541171d89f2e2491130c7771ba58d3] url: https://github.com/0day-ci/linux/commits/Uwe-Kleine-K-nig/bus-Make-remove... base: e73f0f0ee7541171d89f2e2491130c7771ba58d3 config: m68k-allmodconfig (attached as .config) compiler: m68k-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/574fac06c264e69608e3c21bc6594c5b5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Uwe-Kleine-K-nig/bus-Make-remove-callback-return-void/20210713-154310 git checkout 574fac06c264e69608e3c21bc6594c5b5abe1ad4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>): 46 | .remove = nubus_device_remove, | ^~~~~~~~~~~~~~~~~~~ drivers/nubus/bus.c:46:13: note: (near initialization for 'nubus_bus_type.remove') cc1: some warnings being treated as errors -- 166 | .remove = zorro_device_remove, | ^~~~~~~~~~~~~~~~~~~ drivers/zorro/zorro-driver.c:166:13: note: (near initialization for 'zorro_bus_type.remove') cc1: some warnings being treated as errors vim +46 drivers/nubus/bus.c 7f86c765a6a2bb Finn Thain 2018-01-13 41 7f86c765a6a2bb Finn Thain 2018-01-13 42 struct bus_type nubus_bus_type = { 7f86c765a6a2bb Finn Thain 2018-01-13 43 .name = "nubus", 7f86c765a6a2bb Finn Thain 2018-01-13 44 .match = nubus_bus_match, 7f86c765a6a2bb Finn Thain 2018-01-13 45 .probe = nubus_device_probe, 7f86c765a6a2bb Finn Thain 2018-01-13 @46 .remove = nubus_device_remove, 7f86c765a6a2bb Finn Thain 2018-01-13 47 }; 7f86c765a6a2bb Finn Thain 2018-01-13 48 EXPORT_SYMBOL(nubus_bus_type); 7f86c765a6a2bb Finn Thain 2018-01-13 49 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org