[PATCH][next] drm/kmb: fix potential integer overflow on multiplication

[kernel test robot]

Hi Colin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20201112]
[cannot apply to linus/master v5.10-rc3 v5.10-rc2 v5.10-rc1 v5.10-rc3]
[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/Colin-King/drm-kmb-fix-potential-integer-overflow-on-multiplication/20201113-203903
base:    a60b1e1fe9ca5f9d9a79e89a8d71228a8e04d35c
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/bb25aac8771c57130ea5a2a016790e3b7c62e283
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Colin-King/drm-kmb-fix-potential-integer-overflow-on-multiplication/20201113-203903
        git checkout bb25aac8771c57130ea5a2a016790e3b7c62e283
        # 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 at intel.com>

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

>> ERROR: modpost: "__udivdi3" [drivers/gpu/drm/kmb/kmb-drm.ko] undefined!
>> ERROR: modpost: "__divdi3" [drivers/gpu/drm/kmb/kmb-drm.ko] undefined!

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