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Subject: [RESEND PATCH 5/7] IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
Date:   Tue, 19 Feb 2019 21:30:38 -0800
Message-Id: <20190220053040.10831-6-ira.weiny@intel.com>
In-Reply-To: <20190220053040.10831-1-ira.weiny@intel.com>
References: <20190220053040.10831-1-ira.weiny@intel.com>
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From: Ira Weiny <ira.weiny@intel.com>

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@intel.com>
---
 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