tree: https://git.kernel.org/pub/scm/linux/kernel/git/nsaenz/linux-rpi.git rpi-poe head: 53825c079ed1d266e31cbc2d16a3ca6dc467a963 commit: 53825c079ed1d266e31cbc2d16a3ca6dc467a963 [3/3] pwm: Add Raspberry Pi Firmware based PWM bus config: arm-allmodconfig (attached as .config) compiler: arm-linux-gnueabi-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://git.kernel.org/pub/scm/linux/kernel/git/nsaenz/linux-rpi.git/comm... git remote add nsaenz-linux-rpi https://git.kernel.org/pub/scm/linux/kernel/git/nsaenz/linux-rpi.git git fetch --no-tags nsaenz-linux-rpi rpi-poe git checkout 53825c079ed1d266e31cbc2d16a3ca6dc467a963 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>, old ones prefixed by <<): WARNING: modpost: missing MODULE_LICENSE() in drivers/hwtracing/coresight/coresight.o ERROR: modpost: "__aeabi_uldivmod" [drivers/pwm/pwm-raspberrypi.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org