Hi William,

I love your patch! Yet something to improve:

[auto build test ERROR on 5ffeb17c0d3dd44704b4aee83e297ec07666e4d6]

url:    https://github.com/0day-ci/linux/commits/William-Breathitt-Gray/Introduce-the-Counter-character-device-interface/20210827-115154
base:   5ffeb17c0d3dd44704b4aee83e297ec07666e4d6
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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://github.com/0day-ci/linux/commit/4eb2e2f3fe9da9dddf9d8bbb82ff16b1329131ce
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review William-Breathitt-Gray/Introduce-the-Counter-character-device-interface/20210827-115154
        git checkout 4eb2e2f3fe9da9dddf9d8bbb82ff16b1329131ce
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/counter/intel-qep.o: in function `intel_qep_spike_filter_ns_write':
>> intel-qep.c:(.text+0x540): undefined reference to `__aeabi_uldivmod'

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