Hi NeilBrown,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.17-rc1 next-20220127]
[cannot apply to cel-2.6/for-next]
[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/NeilBrown/nfsd-allow-NFSv4-state-to-be-revoked/20220127-130132
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0280e3c58f92b2fe0e8fbbdf8d386449168de4a8
config: s390-randconfig-r004-20220126 (https://download.01.org/0day-ci/archive/20220127/202201272253.LNgeJGaJ-lkp@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/0day-ci/linux/commit/36a49da0c1204b769399e692f540bf2a6332f89a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review NeilBrown/nfsd-allow-NFSv4-state-to-be-revoked/20220127-130132
        git checkout 36a49da0c1204b769399e692f540bf2a6332f89a
        # 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 <lkp@intel.com>

All errors (new ones prefixed by >>):

   s390-linux-ld: fs/nfsd/nfsctl.o: in function `write_unlock_fs':
>> nfsctl.c:(.text+0x302): undefined reference to `nfsd4_revoke_states'

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