tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git zero-initialize-pmem-5.16
head:   34b80c3d1203abd5fd64242ef25898c7d64166ca
commit: 262459cd3e039d51ed6f6c478e1b794dda7d9de8 [25/28] iomap: use accelerated zeroing on a block device to zero a file range
config: hexagon-randconfig-r045-20211007 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 58b68e70ebf6308f982426a2618782f473218eed)
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://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?id=262459cd3e039d51ed6f6c478e1b794dda7d9de8
        git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git
        git fetch --no-tags djwong-xfs zero-initialize-pmem-5.16
        git checkout 262459cd3e039d51ed6f6c478e1b794dda7d9de8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> fs/iomap/buffered-io.c:948:1: warning: no previous prototype for function 'iomap_zeroinit_range' [-Wmissing-prototypes]
   iomap_zeroinit_range(struct inode *inode, loff_t pos, loff_t len,
   ^
   fs/iomap/buffered-io.c:947:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   1 warning generated.
--
>> fs/iomap/buffered-io.c:943: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Force a filesystem to write zeroes to mapped extents, even if they're


vim +/iomap_zeroinit_range +948 fs/iomap/buffered-io.c

   941	
   942	/**
 > 943	 * Force a filesystem to write zeroes to mapped extents, even if they're
   944	 * unwritten.  DAX files are not supported, and the caller should fsync the
   945	 * file before returning to userspace.
   946	 */
   947	int
 > 948	iomap_zeroinit_range(struct inode *inode, loff_t pos, loff_t len,
   949			     const struct iomap_ops *ops)
   950	{
   951		struct iomap_iter iter = {
   952			.inode		= inode,
   953			.pos		= pos,
   954			.len		= len,
   955			.flags		= IOMAP_ZERO,
   956		};
   957		int ret;
   958	
   959		if (IS_DAX(inode))
   960			return -EOPNOTSUPP;
   961	
   962		while ((ret = iomap_iter(&iter, ops)) > 0)
   963			iter.processed = iomap_zero_iter(&iter, NULL, false);
   964		return ret;
   965	}
   966	EXPORT_SYMBOL_GPL(iomap_zeroinit_range);
   967	

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