Hi David, I love your patch! Yet something to improve: [auto build test ERROR on dhowells-fs/fscache-next] [also build test ERROR on linux/master linus/master] [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/David-Howells/afs-Enable-multipage-folio-support/20220226-075436 base: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-next config: i386-randconfig-a005 (https://download.01.org/0day-ci/archive/20220226/202202261524.4tAqmT0a-lkp@xxxxxxxxx/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/91637acf6da0c809e1bedc59696d6bc0a8604f03 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review David-Howells/afs-Enable-multipage-folio-support/20220226-075436 git checkout 91637acf6da0c809e1bedc59696d6bc0a8604f03 # save the config file 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@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): >> ERROR: modpost: "PageHeadHuge" [fs/afs/kafs.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx