[kbuild-all] [staging:greybus 1/2] ERROR: modpost: "input_ff_create_memless" [drivers/staging/greybus/gb-vibrator.ko] undefined!

tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git greybus head: 4b5f28cff45f83ee9e8b851f0e7ff5852ca13878 commit: f300b3468faf250e07e4fca31d0e82b2459d2d69 [1/2] staging: greybus: vibrator: use proper API for vibrator devices config: csky-randconfig-r011-20210720 (attached as .config) compiler: csky-linux-gcc (GCC) 10.3.0 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/gregkh/staging.git/commit... git remote add staging https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git git fetch --no-tags staging greybus git checkout f300b3468faf250e07e4fca31d0e82b2459d2d69 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=csky 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 <<): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org