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    Subject[djwong-xfs:zero-initialize-pmem-5.16 25/28] fs/iomap/buffered-io.c:948:1: warning: no previous prototype for function 'iomap_zeroinit_range'
    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
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