Hi Qi, Thank you for the patch! Yet something to improve: [auto build test ERROR on hnaz-mm/master] [also build test ERROR on driver-core/driver-core-testing linux/master linus/master v5.16-rc5 next-20211215] [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/Qi-Zheng/add-MemAvailable-to-per... base: https://github.com/hnaz/linux-mm master config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20211216/202112162327.HwWtuYUQ-lk...) 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/7980664f23d619d15a3931fe1ab7d1dba... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Qi-Zheng/add-MemAvailable-to-per-node-meminfo/20211216-204828 git checkout 7980664f23d619d15a3931fe1ab7d1dbafad7c88 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash 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 >>): /usr/bin/ld: mm/page_alloc.o: in function `si_mem_available': collect2: error: ld returned 1 exit status --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org