commit 5f1d43de54164dcfb9bfa542fcc92c1e1a1b6c1d upstream. Until there is a solution to the dma-to-dax vs truncate problem it is not safe to allow RDMA to create long standing memory registrations against filesytem-dax vmas.
Link: http://lkml.kernel.org/r/151068941011.7446.7766030590347262502.st...@dwillia2-desk3.amr.corp.intel.com Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings") Signed-off-by: Dan Williams <dan.j.willi...@intel.com> Reported-by: Christoph Hellwig <h...@lst.de> Reviewed-by: Christoph Hellwig <h...@lst.de> Acked-by: Jason Gunthorpe <j...@mellanox.com> Acked-by: Doug Ledford <dledf...@redhat.com> Cc: Sean Hefty <sean.he...@intel.com> Cc: Hal Rosenstock <hal.rosenst...@gmail.com> Cc: Jeff Moyer <jmo...@redhat.com> Cc: Ross Zwisler <ross.zwis...@linux.intel.com> Cc: Inki Dae <inki....@samsung.com> Cc: Jan Kara <j...@suse.cz> Cc: Joonyoung Shim <jy0922.s...@samsung.com> Cc: Kyungmin Park <kyungmin.p...@samsung.com> Cc: Mauro Carvalho Chehab <mche...@kernel.org> Cc: Mel Gorman <mgor...@suse.de> Cc: Seung-Woo Kim <sw0312....@samsung.com> Cc: Vlastimil Babka <vba...@suse.cz> Cc: <sta...@vger.kernel.org> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> --- drivers/infiniband/core/umem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index c22fde6207d1..8e973a2993a6 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -193,7 +193,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, sg_list_start = umem->sg_head.sgl; while (npages) { - ret = get_user_pages(cur_base, + ret = get_user_pages_longterm(cur_base, min_t(unsigned long, npages, PAGE_SIZE / sizeof (struct page *)), gup_flags, page_list, vma_list);
