Hi Xiubo, I love your patch! Yet something to improve: [auto build test ERROR on ceph-client/for-linus] [also build test ERROR on linus/master v5.18-rc7 next-20220516] [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/Xiubo-Li/ceph-wait-async-unlink-to-finish/20220516-202249 base: https://github.com/ceph/ceph-client.git for-linus config: i386-randconfig-a001-20220516 (https://download.01.org/0day-ci/archive/20220517/202205170402.ez4Z5njh-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 853fa8ee225edf2d0de94b0dcbd31bea916e825e) 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/85d578952d01b70d71fccd86ccb0fdd1dbd0df8b git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Xiubo-Li/ceph-wait-async-unlink-to-finish/20220516-202249 git checkout 85d578952d01b70d71fccd86ccb0fdd1dbd0df8b # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): >> ld.lld: error: undefined symbol: ceph_wait_on_conflict_unlink >>> referenced by dir.c >>> ceph/dir.o:(ceph_link) in archive fs/built-in.a >>> referenced by dir.c >>> ceph/dir.o:(ceph_symlink) in archive fs/built-in.a >>> referenced by dir.c >>> ceph/dir.o:(ceph_mkdir) in archive fs/built-in.a >>> referenced 3 more times -- 0-DAY CI Kernel Test Service https://01.org/lkp