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

[kernel test robot]

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/?id=f300b3468faf250e07e4fca31d0e82b2459d2d69
        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@xxxxxxxxx>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "input_ff_create_memless" [drivers/staging/greybus/gb-vibrator.ko] undefined!
>> ERROR: modpost: "input_set_capability" [drivers/staging/greybus/gb-vibrator.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
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