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    SubjectRe: [PATCH 10 of 20] ipath - support for userspace apps using core driver
        Nick> But it doesn't look like dma_alloc_coherent is guaranteed to
    Nick> return memory allocated from the regular page allocator, nor
    Nick> even memory backed by a struct page.

    Nick> For example, I see one that returns kmalloc()ed memory. If
    Nick> the pages for the slab are already allocated then __GFP_COMP
    Nick> will not do anything there. i386 looks like it has a path
    Nick> that uses ioremap...

    Ugh. So is there a correct way to map DMA-able memory into userspace?

    - R.
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