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    SubjectRe: [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl
    Hi Daeho,

    Thank you for the patch! Perhaps something to improve:

    [auto build test WARNING on f2fs/dev-test]
    [also build test WARNING on linus/master v5.9 next-20201022]
    [cannot apply to linux/master]
    [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/Daeho-Jeong/f2fs-add-F2FS_IOC_GET_COMPRESS_OPTION-ioctl/20201022-115947
    base: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
    config: x86_64-randconfig-s022-20201022 (attached as .config)
    compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
    reproduce:
    # apt-get install sparse
    # sparse version: v0.6.3-17-g2d3af347-dirty
    # https://github.com/0day-ci/linux/commit/d869d11ac39edb97c13765c59163d12f56dccd6f
    git remote add linux-review https://github.com/0day-ci/linux
    git fetch --no-tags linux-review Daeho-Jeong/f2fs-add-F2FS_IOC_GET_COMPRESS_OPTION-ioctl/20201022-115947
    git checkout d869d11ac39edb97c13765c59163d12f56dccd6f
    # save the attached .config to linux build tree
    make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64

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


    "sparse warnings: (new ones prefixed by >>)"
    >> fs/f2fs/compress.c:543:44: sparse: sparse: Using plain integer as NULL pointer

    vim +543 fs/f2fs/compress.c

    540
    541 bool f2fs_is_compress_algorithm_ready(unsigned char algorithm)
    542 {
    > 543 return algorithm >= COMPRESS_MAX ? false : f2fs_cops[algorithm];
    544 }
    545

    ---
    0-DAY CI Kernel Test Service, Intel Corporation
    https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
    [unhandled content-type:application/gzip]
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