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: sparc64-randconfig-r036-20210713 (attached as .config) compiler: sparc64-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=sparc64 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 >>): 160 | .remove = vio_device_remove, | ^~~~~~~~~~~~~~~~~ arch/sparc/kernel/vio.c:160:13: note: (near initialization for 'vio_bus_type.remove') cc1: all warnings being treated as errors vim +160 arch/sparc/kernel/vio.c e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 153 e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 154 static struct bus_type vio_bus_type = { e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 155 .name = "vio", 33acc6db64f77a arch/sparc/kernel/vio.c Greg Kroah-Hartman 2017-06-06 156 .dev_groups = vio_dev_groups, 5bde2c9be701c4 arch/sparc/kernel/vio.c John Paul Adrian Glaubitz 2016-04-14 157 .uevent = vio_hotplug, e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 158 .match = vio_bus_match, e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 159 .probe = vio_device_probe, e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 @160 .remove = vio_device_remove, e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 161 }; e53e97ce3c7119 arch/sparc64/kernel/vio.c David S. Miller 2007-07-09 162 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org