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    Subjectfs/super.c:1785:15: sparse: sparse: Using plain integer as NULL pointer
    tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
    head: 6bc40e44f1ddef16a787f3501b97f1fff909177c
    commit: 439bc39b3cf0014b1b75075812f7ef0f8baa9674 fs: move sb_init_dio_done_wq out of direct-io.c
    date: 10 months ago
    config: hexagon-randconfig-r121-20231117 (https://download.01.org/0day-ci/archive/20231118/202311180239.Iu9L00NA-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/20231118/202311180239.Iu9L00NA-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/202311180239.Iu9L00NA-lkp@intel.com/

    sparse warnings: (new ones prefixed by >>)
    >> fs/super.c:1785:15: sparse: sparse: Using plain integer as NULL pointer

    vim +1785 fs/super.c

    1767
    1768 /*
    1769 * Create workqueue for deferred direct IO completions. We allocate the
    1770 * workqueue when it's first needed. This avoids creating workqueue for
    1771 * filesystems that don't need it and also allows us to create the workqueue
    1772 * late enough so the we can include s_id in the name of the workqueue.
    1773 */
    1774 int sb_init_dio_done_wq(struct super_block *sb)
    1775 {
    1776 struct workqueue_struct *old;
    1777 struct workqueue_struct *wq = alloc_workqueue("dio/%s",
    1778 WQ_MEM_RECLAIM, 0,
    1779 sb->s_id);
    1780 if (!wq)
    1781 return -ENOMEM;
    1782 /*
    1783 * This has to be atomic as more DIOs can race to create the workqueue
    1784 */
    > 1785 old = cmpxchg(&sb->s_dio_done_wq, NULL, wq);

    --
    0-DAY CI Kernel Test Service
    https://github.com/intel/lkp-tests/wiki

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