# \[PATCH V2 7/7\] IB/mthca: Use the new FOLL\_LONGTERM flag to get\_user\_pages\_fast()

- From: \<hidden\>
- Date: 2019-02-13 23:06:05 
- List: netdev
- Page: https://ratatoskr.run/netdev/2019/02/5513859
- Thread: https://ratatoskr.run/linux-mips/2019/02/5513864/t.md

```text
From: Ira Weiny <redacted>

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

Signed-off-by: Ira Weiny <redacted>
---
 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

```