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    SubjectRe: [PATCH 04/15] mm: remove the pgmap field from struct hmm_vma_walk
    On Thu, Aug 15, 2019 at 04:33:06PM -0400, Jerome Glisse wrote:
    > So nor HMM nor driver should dereference the struct page (i do not
    > think any iommu driver would either),

    Both current hmm drivers convert the hmm pfn back to a page and
    eventually call dma_map_page on it. As do the ODP patches from you.

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