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    Subject[PATCH v4 65/73] dax: Fix sparse warning
    Date
    From: Matthew Wilcox <mawilcox@microsoft.com>

    sparse doesn't know that follow_pte_pmd conditionally acquires the ptl,
    so add an annotation to let it know what's going on.

    Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
    ---
    fs/dax.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/fs/dax.c b/fs/dax.c
    index c663d82e8ba3..7a86ff1153dd 100644
    --- a/fs/dax.c
    +++ b/fs/dax.c
    @@ -531,6 +531,7 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
    */
    if (follow_pte_pmd(vma->vm_mm, address, &start, &end, &ptep, &pmdp, &ptl))
    continue;
    + __acquire(ptl); /* Conditionally acquired above */

    /*
    * No need to call mmu_notifier_invalidate_range() as we are
    --
    2.15.0
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