Hi Tony, I love your patch! Yet something to improve: [auto build test ERROR on tip/x86/sgx] [also build test ERROR on rafael-pm/linux-next hnaz-mm/master v5.16-rc1 next-20211118] [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/Tony-Luck/x86-sgx-Add-new-sgx_ep... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 71eba1c0939e3b1ad1b71fe0171de30e265437e3 config: x86_64-randconfig-r001-20211025 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a461fa64bb37cffd73f683c74f6b0780379fc2ca) 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 # https://github.com/0day-ci/linux/commit/bb9a962c5c9e30df5df1546cf8843b3ba... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Tony-Luck/x86-sgx-Add-new-sgx_epc_page-flag-bit-to-mark-free-pages/20211019-052547 git checkout bb9a962c5c9e30df5df1546cf8843b3ba3f1476a # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 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 >>): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org