COVER LETTERhmm-5.1-v2

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+This patchset improves the HMM driver API and add support for mirroring
+virtual address that are mmap of hugetlbfs or of a file in a filesystem
+on a DAX block device. You can find a tree with all the patches [1]
+
+This patchset is necessary for converting ODP to HMM and patch to do so
+as been posted [2]. All new functions introduced by this patchset are use
+by the ODP patch. The ODP patch will be push through the RDMA tree the
+release after this patchset is merged.
+
+Moreover all HMM functions are use by the nouveau driver starting in 5.1.
+
+The last patch in the serie add helpers to directly dma map/unmap pages
+for virtual addresses that are mirrored on behalf of device driver. This
+is a common pattern accross HMM device driver. It will be first use by
+the ODP RDMA code and will latter get use by nouveau and other driver that
+are working on including HMM support.
+
+[1] https://cgit.freedesktop.org/~glisse/linux/log/?h=hmm-for-5.1-v2
+[2] https://cgit.freedesktop.org/~glisse/linux/log/?h=odp-hmm