Hi Xiyu, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on ceph-client/for-linus] [also build test WARNING on v5.14-rc1 next-20210716] [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/Xiyu-Yang/ceph-Convert-from-atom... base: https://github.com/ceph/ceph-client.git for-linus config: arm-randconfig-r034-20210718 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5d5b08761f944d5b9822d582378333cc4b36a0a7) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/af8e5c68ccb6a1e5aead78e10d6d0441c... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xiyu-Yang/ceph-Convert-from-atomic_t-to-refcount_t-on-ceph_snap_realm-nref/20210718-111108 git checkout af8e5c68ccb6a1e5aead78e10d6d0441c032ba66 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from fs/ceph/quota.c:10: In file included from fs/ceph/super.h:6: #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt ^ include/linux/printk.h:301:9: note: previous definition is here #define pr_fmt(fmt) fmt ^ 1 warning generated. vim +/pr_fmt +5 include/linux/ceph/ceph_debug.h de57606c23afde fs/ceph/ceph_debug.h Sage Weil 2009-10-06 4 de57606c23afde fs/ceph/ceph_debug.h Sage Weil 2009-10-06 @5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt de57606c23afde fs/ceph/ceph_debug.h Sage Weil 2009-10-06 6 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org