Hi Mike,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on linux/master]
[also build test WARNING on linus/master hnaz-linux-mm/master v5.11-rc3 next-20210111]
[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/Mike-Kravetz/create-hugetlb-flags-to-consolidate-state/20210112-050554
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 09162bc32c880a791c6c0668ce0745cf7958f576
config: s390-randconfig-s032-20210111 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-208-g46a52ca4-dirty
        # https://github.com/0day-ci/linux/commit/749ba97a58afa340623c1c3042c64b206a23128e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Mike-Kravetz/create-hugetlb-flags-to-consolidate-state/20210112-050554
        git checkout 749ba97a58afa340623c1c3042c64b206a23128e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=s390 

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


"sparse warnings: (new ones prefixed by >>)"
>> fs/hugetlbfs/inode.c:973:39: sparse: sparse: Using plain integer as NULL pointer

vim +973 fs/hugetlbfs/inode.c

   957	
   958	static int hugetlbfs_migrate_page(struct address_space *mapping,
   959					struct page *newpage, struct page *page,
   960					enum migrate_mode mode)
   961	{
   962		int rc;
   963	
   964		rc = migrate_huge_page_move_mapping(mapping, newpage, page);
   965		if (rc != MIGRATEPAGE_SUCCESS)
   966			return rc;
   967	
   968		/*
   969		 * Transfer any subpool pointer to the new page.
   970		 */
   971		if (hpage_spool(page)) {
   972			set_hpage_spool(newpage, hpage_spool(page));
 > 973			set_hpage_spool(page, 0);
   974		}
   975	
   976		if (mode != MIGRATE_SYNC_NO_COPY)
   977			migrate_page_copy(newpage, page);
   978		else
   979			migrate_page_states(newpage, page);
   980	
   981		return MIGRATEPAGE_SUCCESS;
   982	}
   983	

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