Hi Muchun, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20201210] [cannot apply to driver-core/driver-core-testing linus/master hnaz-linux-mm/master v5.10-rc7 v5.10-rc6 v5.10-rc5 v5.10-rc7] [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/Muchun-Song/Convert-all-THP-vmst... base: 14240d4c5b25d087529691ccf4d7ea256f26cfdf config: powerpc64-randconfig-r031-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5ff35356f1af2bb92785b38c657463924d9ec386) 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 # install powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/0day-ci/linux/commit/3bf6ad1cc5d5164b173fe46c926ca72e1... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Muchun-Song/Convert-all-THP-vmstat-counters-to-pages/20201211-122410 git checkout 3bf6ad1cc5d5164b173fe46c926ca72e11b64fac # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org