[PATCH v5 66/78] dax: Fix sparse warning

From: Matthew Wilcox
Date: Fri Dec 15 2017 - 17:10:37 EST


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 f591ab5be590..6ef727af30f0 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
--
2.15.1