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    SubjectRe: [PATCH 02/15] mm, dax: introduce pfn_t_special()
    Date
    Dan Williams <dan.j.williams@intel.com> writes:

    > In support of removing the VM_MIXEDMAP indication from DAX VMAs,
    > introduce pfn_t_special() for drivers to indicate that _PAGE_SPECIAL
    > should be used for DAX ptes. This also helps identify drivers like
    > dccssblk that only want to use DAX in a read-only fashion without
    > get_user_pages() support.
    >
    > Ideally we could delete axonram and dcssblk DAX support, but if we need
    > to keep it better make it explicit that axonram and dcssblk only support
    > a sub-set of DAX due to missing _PAGE_DEVMAP support.

    I sent a patch to remove axonram (sorry meant to Cc you):

    http://patchwork.ozlabs.org/patch/833588/

    Will see if there's any feedback.

    cheers

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