Hi Alex, I love your patch! Yet something to improve: [auto build test ERROR on vfio/next] [also build test ERROR on v5.11-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/Alex-Williamson/vfio-type1-Use-f... base: https://github.com/awilliam/linux-vfio.git next config: x86_64-rhel (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/d1aea3bcf226e5225e706acb7df2f4c68... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alex-Williamson/vfio-type1-Use-follow_pte/20210213-030541 git checkout d1aea3bcf226e5225e706acb7df2f4c68ea8858a # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>, old ones prefixed by <<): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org