[PATCH v4 65/73] dax: Fix sparse warning

[Matthew Wilcox]

From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
 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