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[Xen-devel] [PATCH V2 5/7] IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
- To: linux-mips@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kvm-ppc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-fpga@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-fbdev@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, rds-devel@xxxxxxxxxxxxxx
- From: ira.weiny@xxxxxxxxx
- Date: Wed, 13 Feb 2019 15:04:53 -0800
- Cc: Martin Brandenburg <martin@xxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, David Airlie <airlied@xxxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, Kai Mäkisara <Kai.Makisara@xxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Ira Weiny <ira.weiny@xxxxxxxxx>, Ben Chan <benchan@xxxxxxxxxxxx>, Rob Springer <rspringer@xxxxxxxxxx>, Todd Poynor <toddpoynor@xxxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>, Wu Hao <hao.wu@xxxxxxxxx>, Alan Tull <atull@xxxxxxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>, "James E.J. Bottomley" <jejb@xxxxxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, Jens Wiklander <jens.wiklander@xxxxxxxxxx>, Alexandre Bounine <alex.bou9@xxxxxxxxx>, Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Moritz Fischer <mdf@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Christian Benvenuti <benve@xxxxxxxxx>
- Delivery-date: Thu, 14 Feb 2019 05:47:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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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