Hi "Joel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20200116]
[cannot apply to rcu/dev linux/master linus/master v5.5-rc6 v5.5-rc5 v5.5-rc4 v5.5-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Joel-Fernandes-Google/rcuperf-Add-support-to-vary-the-slab-object-sizes/20200117-101205
base:    2747d5fdab78f43210256cd52fb2718e0b3cce74
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

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

All errors (new ones prefixed by >>):

>> ERROR: "__divdi3" [kernel/rcu/rcuperf.ko] undefined!

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0-DAY kernel test infrastructure                 Open Source Technology Center
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