The patch titled Subject: mm: fail get_vaddr_frames() for filesystem-dax mappings has been added to the -mm tree. Its filename is mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch

This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-fail-get_vaddr_frames-for-filesy... and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-fail-get_vaddr_frames-for-filesy...

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------------------------------------------------------ From: Dan Williams dan.j.williams@intel.com Subject: mm: fail get_vaddr_frames() for filesystem-dax mappings

Until there is a solution to the dma-to-dax vs truncate problem it is not safe to allow V4L2, Exynos, and other frame vector users to create long standing / irrevocable memory registrations against filesytem-dax vmas.

Link: http://lkml.kernel.org/r/151068939985.7446.15684639617389154187.stgit@dwilli... Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings") Signed-off-by: Dan Williams dan.j.williams@intel.com Cc: Inki Dae inki.dae@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Kyungmin Park kyungmin.park@samsung.com Cc: Mauro Carvalho Chehab mchehab@kernel.org Cc: Jan Kara jack@suse.cz Cc: Mel Gorman mgorman@suse.de Cc: Vlastimil Babka vbabka@suse.cz Cc: Christoph Hellwig hch@lst.de Cc: Doug Ledford dledford@redhat.com Cc: Hal Rosenstock hal.rosenstock@gmail.com Cc: Jason Gunthorpe jgunthorpe@obsidianresearch.com Cc: Jeff Moyer jmoyer@redhat.com Cc: Ross Zwisler ross.zwisler@linux.intel.com Cc: Sean Hefty sean.hefty@intel.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/frame_vector.c | 4 ++++ 1 file changed, 4 insertions(+)

diff -puN mm/frame_vector.c~mm-fail-get_vaddr_frames-for-filesystem-dax-mappings mm/frame_vector.c --- a/mm/frame_vector.c~mm-fail-get_vaddr_frames-for-filesystem-dax-mappings +++ a/mm/frame_vector.c @@ -53,6 +53,10 @@ int get_vaddr_frames(unsigned long start ret = -EFAULT; goto out; } + + if (vma_is_fsdax(vma)) + return -EOPNOTSUPP; + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { vec->got_ref = true; vec->is_pfns = false; _

Patches currently in -mm which might be from dan.j.williams@intel.com are

mm-fix-device-dax-pud-write-faults-triggered-by-get_user_pages.patch mm-fix-device-dax-pud-write-faults-triggered-by-get_user_pages-v3.patch mm-switch-to-define-pmd_write-instead-of-__have_arch_pmd_write.patch mm-replace-pud_write-with-pud_access_permitted-in-fault-gup-paths.patch mm-replace-pud_write-with-pud_access_permitted-in-fault-gup-paths-v3.patch mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths.patch mm-replace-pte_write-with-pte_access_permitted-in-fault-gup-paths.patch mm-hugetlbfs-introduce-split-to-vm_operations_struct.patch device-dax-implement-split-to-catch-invalid-munmap-attempts.patch mm-introduce-get_user_pages_longterm.patch mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch v4l2-disable-filesystem-dax-mapping-support.patch ib-core-disable-memory-registration-of-fileystem-dax-vmas.patch