[Xen-devel] [RESEND PATCH 5/7] IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast()

[ira.weiny@xxxxxxxxx]

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/hfi1/user_pages.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/user_pages.c 
b/drivers/infiniband/hw/hfi1/user_pages.c
index 78ccacaf97d0..6a7f9cd5a94e 100644
--- a/drivers/infiniband/hw/hfi1/user_pages.c
+++ b/drivers/infiniband/hw/hfi1/user_pages.c
@@ -104,9 +104,11 @@ int hfi1_acquire_user_pages(struct mm_struct *mm, unsigned 
long vaddr, size_t np
                            bool writable, struct page **pages)
 {
        int ret;
+       unsigned int gup_flags = writable ? FOLL_WRITE : 0;
 
-       ret = get_user_pages_fast(vaddr, npages, writable ? FOLL_WRITE : 0,
-                                 pages);
+       gup_flags |= FOLL_LONGTERM;
+
+       ret = get_user_pages_fast(vaddr, npages, gup_flags, pages);
        if (ret < 0)
                return ret;
 
-- 
2.20.1


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