[PATCH v4 35/35] mm: Avoid rewalk in mmap_region

[Liam R. Howlett]

If the iterator has moved to the previous entry, then step forward one
range, back to the gap.

Signed-off-by: Liam R. Howlett <Liam.Howlett at oracle.com>
---
 mm/mmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/mmap.c b/mm/mmap.c
index 1602c854133a..71733953ff83 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2636,6 +2636,9 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 	}
 
 cannot_expand:
+	if (prev)
+		vma_iter_next_range(&vmi);
+
 	/*
 	 * Determine the object being mapped and call the appropriate
 	 * specific mapper. the address has already been validated, but
-- 
2.39.2