Hi Hugh,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hch-configfs/for-next]
[also build test WARNING 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: ia64-randconfig-r016-20210730 (attached as .config)
compiler: ia64-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/7d2aab7d716c95551b2bcab51ca8ff33c2d1dd58
        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 7d2aab7d716c95551b2bcab51ca8ff33c2d1dd58
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=ia64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:153,
                    from include/linux/pgtable.h:6,
                    from arch/ia64/include/asm/uaccess.h:40,
                    from include/linux/uaccess.h:11,
                    from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:33,
                    from mm/shmem.c:24:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
   arch/ia64/include/asm/mmu_context.h:127:41: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
     127 |  unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                         ^~~~~~~
   mm/shmem.c: At top level:
>> mm/shmem.c:695:6: warning: no previous prototype for 'transparent_hugepage_allowed' [-Wmissing-prototypes]
     695 | bool transparent_hugepage_allowed(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/transparent_hugepage_allowed +695 mm/shmem.c

   694	
 > 695	bool transparent_hugepage_allowed(void)
   696	{
   697		return false;
   698	}
   699	

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