Hi Shiyang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on hnaz-mm/master]
[also build test ERROR on next-20220408]
[cannot apply to xfs-linux/for-next linus/master linux/master v5.18-rc1]
[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/intel-lab-lkp/linux/commits/Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20220411-001048
base:   https://github.com/hnaz/linux-mm master
config: s390-defconfig 
(https://download.01.org/0day-ci/archive/20220411/202204110240.oa3g7lsw-...@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.2.0
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/intel-lab-lkp/linux/commit/bf68be0c39b8ecc4223b948a9ee126af167d74f0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review 
Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20220411-001048
        git checkout bf68be0c39b8ecc4223b948a9ee126af167d74f0
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross 
O=build_dir ARCH=s390 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   s390-linux-ld: fs/xfs/xfs_buf.o: in function `xfs_alloc_buftarg':
>> fs/xfs/xfs_buf.c:1968: undefined reference to `xfs_dax_holder_operations'
   pahole: .tmp_vmlinux.btf: No such file or directory
   .btf.vmlinux.bin.o: file not recognized: file format not recognized


vim +1968 fs/xfs/xfs_buf.c

  1955  
  1956  struct xfs_buftarg *
  1957  xfs_alloc_buftarg(
  1958          struct xfs_mount        *mp,
  1959          struct block_device     *bdev)
  1960  {
  1961          xfs_buftarg_t           *btp;
  1962  
  1963          btp = kmem_zalloc(sizeof(*btp), KM_NOFS);
  1964  
  1965          btp->bt_mount = mp;
  1966          btp->bt_dev =  bdev->bd_dev;
  1967          btp->bt_bdev = bdev;
> 1968          btp->bt_daxdev = fs_dax_get_by_bdev(bdev, 
> &btp->bt_dax_part_off, mp,
  1969                                              &xfs_dax_holder_operations);
  1970  
  1971          /*
  1972           * Buffer IO error rate limiting. Limit it to no more than 10 
messages
  1973           * per 30 seconds so as to not spam logs too much on repeated 
errors.
  1974           */
  1975          ratelimit_state_init(&btp->bt_ioerror_rl, 30 * HZ,
  1976                               DEFAULT_RATELIMIT_BURST);
  1977  
  1978          if (xfs_setsize_buftarg_early(btp, bdev))
  1979                  goto error_free;
  1980  
  1981          if (list_lru_init(&btp->bt_lru))
  1982                  goto error_free;
  1983  
  1984          if (percpu_counter_init(&btp->bt_io_count, 0, GFP_KERNEL))
  1985                  goto error_lru;
  1986  
  1987          btp->bt_shrinker.count_objects = xfs_buftarg_shrink_count;
  1988          btp->bt_shrinker.scan_objects = xfs_buftarg_shrink_scan;
  1989          btp->bt_shrinker.seeks = DEFAULT_SEEKS;
  1990          btp->bt_shrinker.flags = SHRINKER_NUMA_AWARE;
  1991          if (register_shrinker(&btp->bt_shrinker))
  1992                  goto error_pcpu;
  1993          return btp;
  1994  
  1995  error_pcpu:
  1996          percpu_counter_destroy(&btp->bt_io_count);
  1997  error_lru:
  1998          list_lru_destroy(&btp->bt_lru);
  1999  error_free:
  2000          kmem_free(btp);
  2001          return NULL;
  2002  }
  2003  

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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