Hi Chunyan, I love your patch! Yet something to improve: [auto build test ERROR on power-supply/for-next] [also build test ERROR on linux/master linus/master v5.8-rc5 next-20200716] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Chunyan-Zhang/power-supply-sc27x... base: https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next config: m68k-allyesconfig (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 # 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 >>): m68k-linux-ld: drivers/power/supply/sc27xx_fuel_gauge.o: in function `sc27xx_fgu_hw_init': sc27xx_fuel_gauge.c:(.text+0x13ec): undefined reference to `__divdi3' m68k-linux-ld: drivers/power/supply/sc27xx_fuel_gauge.o: in function `sc27xx_fgu_get_vbat_vol': sc27xx_fuel_gauge.c:(.text+0x1d8): undefined reference to `__divdi3' m68k-linux-ld: drivers/power/supply/sc27xx_fuel_gauge.o: in function `sc27xx_fgu_get_current': sc27xx_fuel_gauge.c:(.text+0x2b8): undefined reference to `__divdi3' m68k-linux-ld: sc27xx_fuel_gauge.c:(.text+0x2d4): undefined reference to `__divdi3' m68k-linux-ld: drivers/power/supply/sc27xx_fuel_gauge.o:sc27xx_fuel_gauge.c:(.text+0x84e): more undefined references to `__divdi3' follow --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org