Hi David,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.9 next-20201016]
[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/David-Gow/fat-Add-KUnit-tests-for-checksums-and-timestamps/20201017-144157
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 071a0578b0ce0b0e543d1e38ee6926b9cc21c198
config: m68k-allmodconfig (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
        # https://github.com/0day-ci/linux/commit/318413ec0ade19d4570ae13fc42afb289246d50f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review David-Gow/fat-Add-KUnit-tests-for-checksums-and-timestamps/20201017-144157
        git checkout 318413ec0ade19d4570ae13fc42afb289246d50f
        # 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@intel.com>

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

>> ERROR: modpost: "fat_time_fat2unix" [fs/fat/fat_test.ko] undefined!

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