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    SubjectRe: [PATCH 10 of 20] ipath - support for userspace apps using core driver
        Andrew> Someone left PG_private set on this page (!)

    How does PG_private get set? Could doing a > 1 page kmalloc set it
    (because we end up with a compound page)?

    Andrew> You need to decide who "owns" these pages. Once that's
    Andrew> decided, it tells you who should release them.

    [... really good guide to mapping pages into userspace snipped ...]

    How about the case where one wants to map pages from
    dma_alloc_coherent() into userspace? It seems one should do
    get_page() in .nopage, and then the driver can do dma_free_coherent()
    when the vma is released.

    Or maybe it's just simpler to use vm_insert_page() in the .mmap method
    and not try to be fancy with .nopage?

    - R.
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