From: Dan Williams <dan.j.williams@xxxxxxxxx> Subject: IB/core: disable memory registration of filesystem-dax vmas 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.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings") Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Reported-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Acked-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx> Cc: Sean Hefty <sean.hefty@xxxxxxxxx> Cc: Doug Ledford <dledford@xxxxxxxxxx> Cc: Hal Rosenstock <hal.rosenstock@xxxxxxxxx> Cc: Jeff Moyer <jmoyer@xxxxxxxxxx> Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Cc: Inki Dae <inki.dae@xxxxxxxxxxx> Cc: Jan Kara <jack@xxxxxxx> Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx> Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/infiniband/core/umem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/infiniband/core/umem.c~ib-core-disable-memory-registration-of-fileystem-dax-vmas drivers/infiniband/core/umem.c --- a/drivers/infiniband/core/umem.c~ib-core-disable-memory-registration-of-fileystem-dax-vmas +++ a/drivers/infiniband/core/umem.c @@ -191,7 +191,7 @@ struct ib_umem *ib_umem_get(struct ib_uc 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); _