On Wed, 2017-11-29 at 16:10 -0800, akpm@xxxxxxxxxxxxxxxxxxxx wrote: > 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> Acked-by: Doug Ledford <dledford@xxxxxxxxxx> > --- > > 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); > _ -- Doug Ledford <dledford@xxxxxxxxxx> GPG KeyID: B826A3330E572FDD Key fingerprint = AE6B 1BDA 122B 23B4 265B 1274 B826 A333 0E57 2FDD
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