Hi Venky,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on ceph-client/for-linus]
[also build test ERROR on v5.14-rc6 next-20210818]
[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/Venky-Shankar/ceph-add-debugfs-entries-signifying-new-mount-syntax-support/20210818-140321
base:   https://github.com/ceph/ceph-client.git for-linus
config: hexagon-randconfig-r025-20210817 (attached as .config)
compiler: clang version 12.0.0
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/93ace7e15eedcf62ee9a96c7396482133470e651
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Venky-Shankar/ceph-add-debugfs-entries-signifying-new-mount-syntax-support/20210818-140321
        git checkout 93ace7e15eedcf62ee9a96c7396482133470e651
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 

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 >>):

>> net/ceph/debugfs.c:492:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
   1 error generated.


vim +492 net/ceph/debugfs.c

   489	
   490	struct dentry *ceph_debugfs_create_subdir(const char *subdir)
   491	{
 > 492	}
   493	EXPORT_SYMBOL(ceph_debugfs_create_subdir);
   494	

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