[RESEND PATCH 7/7] IB/mthca: Use the new FOLL_LONGTERM flag to get_user_pages_fast()

[ira . weiny]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

Use the new FOLL_LONGTERM to get_user_pages_fast() to protect against
FS DAX pages being mapped.

Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 drivers/infiniband/hw/mthca/mthca_memfree.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index 112d2f38e0de..8ff0e90d7564 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -472,7 +472,8 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 		goto out;
 	}
 
-	ret = get_user_pages_fast(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages);
+	ret = get_user_pages_fast(uaddr & PAGE_MASK, 1,
+				  FOLL_WRITE | FOLL_LONGTERM, pages);
 	if (ret < 0)
 		goto out;
 
-- 
2.20.1