Hi Jing,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on 7caa04b36f204a01dac65582b71d26d190a1e022]

url:    https://github.com/0day-ci/linux/commits/Jing-Zhang/Linear-and-Logarithmic-histogram-statistics/20210707-020549
base:   7caa04b36f204a01dac65582b71d26d190a1e022
config: mips-malta_kvm_defconfig (attached as .config)
compiler: mipsel-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/aba26c018828dadbff3f53e058c161fab2b09d35
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jing-Zhang/Linear-and-Logarithmic-histogram-statistics/20210707-020549
        git checkout aba26c018828dadbff3f53e058c161fab2b09d35
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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: "__udivdi3" [arch/mips/kvm/kvm.ko] undefined!

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