Hi Hugh,

I love your patch! Yet something to improve:

[auto build test ERROR on hch-configfs/for-next]
[also build test ERROR on linus/master v5.14-rc3 next-20210729]
[cannot apply to hnaz-linux-mm/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/Hugh-Dickins/tmpfs-HUGEPAGE-and-MEM_LOCK-fcntls-and-memfds/20210730-161413
base:   git://git.infradead.org/users/hch/configfs.git for-next
config: riscv-randconfig-r022-20210730 (attached as .config)
compiler: riscv64-linux-gcc (GCC) 10.3.0
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/cad243cc46d563d62f2e0a20faa6571f7c6a692e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Hugh-Dickins/tmpfs-HUGEPAGE-and-MEM_LOCK-fcntls-and-memfds/20210730-161413
        git checkout cad243cc46d563d62f2e0a20faa6571f7c6a692e
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=riscv 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 >>):

   riscv64-linux-ld: mm/shmem.o: in function `.L14':
>> shmem.c:(.text+0xec): undefined reference to `user_shm_lock'

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