Hi Jianqun, First bad commit (maybe != root cause): tree: https://github.com/0day-ci/linux/commits/UPDATE-20200908-102106/Jianqun-X... head: a776a4cf1db2ee8aa66af470cd58c14a956c28ff commit: 2538e20be43ec8b9aa8e5ca1518c9fc3600b502e [2/5] pinctrl: rockchip: make driver be tristate module config: mips-allmodconfig (attached as .config) compiler: mips-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 2538e20be43ec8b9aa8e5ca1518c9fc3600b502e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 <<): ERROR: modpost: "fw_arg3" [drivers/mtd/parsers/bcm63xxpart.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org