[driver-core:driver-core-testing 2/16] fs/kernfs/mount.c:50:5: warning: no previous prototype for function 'kernfs_statfs'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git driver-core-testing
head:   b84388be432d001b3baa782fa047eddb0f375233
commit: 26dd6e284e277f80468f48b4ff8ebfb0e9ca7369 [2/16] kernfs: attach uuid for every kernfs and report it in fsid
config: arm-randconfig-r005-20230801 (https://download.01.org/0day-ci/archive/20230805/202308050054.TMaWFpME-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230805/202308050054.TMaWFpME-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308050054.TMaWFpME-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/kernfs/mount.c:50:5: warning: no previous prototype for function 'kernfs_statfs' [-Wmissing-prototypes]
      50 | int kernfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         |     ^
   fs/kernfs/mount.c:50:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      50 | int kernfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         | ^
         | static 
   1 warning generated.


vim +/kernfs_statfs +50 fs/kernfs/mount.c

    49	
  > 50	int kernfs_statfs(struct dentry *dentry, struct kstatfs *buf)
    51	{
    52		simple_statfs(dentry, buf);
    53		buf->f_fsid = uuid_to_fsid(dentry->d_sb->s_uuid.b);
    54		return 0;
    55	}
    56	

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