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_epc_page-flag-bit-to-mark-free-pages/20211019-052547
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/bb9a962c5c9e30df5df1546cf8843b3ba3f1476a
        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@intel.com>

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: xa_store_range
   >>> referenced by main.c:654 (arch/x86/kernel/cpu/sgx/main.c:654)
   >>>               kernel/cpu/sgx/main.o:(sgx_setup_epc_section) in archive arch/x86/built-in.a

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org