diff mbox

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

Message ID 20171215220450.7899-67-willy@infradead.org (mailing list archive)
State New, archived
Headers show

Commit Message

Matthew Wilcox Dec. 15, 2017, 10:04 p.m. UTC 
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(+)
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Patch

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