Hi NeilBrown, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on nfsd/nfsd-next] [also build test WARNING on kdave/for-next hch-configfs/for-next linus/master v5.14-rc3 next-20210727] [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/expose-btrfs-subvols-in-mount-table-correctly/20210728-064502 base: git://linux-nfs.org/~bfields/linux.git nfsd-next config: i386-randconfig-s002-20210728 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/58749022685aea90dfddfb9f8b2fcdc74dee6ec0 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review NeilBrown/expose-btrfs-subvols-in-mount-table-correctly/20210728-064502 git checkout 58749022685aea90dfddfb9f8b2fcdc74dee6ec0 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash fs/btrfs/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> fs/btrfs/inode.c:5868:5: sparse: sparse: symbol 'btrfs_mountpoint_expiry_timeout' was not declared. Should it be static? Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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