[PATCH V2 5/7] IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
From: ira.weiny@intel.com
Date: 2019-02-13 23:05:49
Also in:
ceph-devel, dri-devel, kvm, linux-fpga, linux-media, linux-mips, linux-mm, linux-rdma, linux-s390, linux-scsi, linux-sh, linuxppc-dev, lkml, netdev, sparclinux
Subsystem:
infiniband subsystem, the rest · Maintainers:
Jason Gunthorpe, Leon Romanovsky, Linus Torvalds
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