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: i386-randconfig-a005-20210712 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # 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
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 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 >>):

   ld: arch/x86/../../virt/kvm/binary_stats.o: in function `kvm_stats_linear_hist_update':
>> binary_stats.c:(.text+0x1ac): undefined reference to `__udivdi3'

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