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    SubjectRe: [RFC] ARM DMA mapping TODO, v1
    On Thu, Apr 28, 2011 at 07:31:06AM +1000, Benjamin Herrenschmidt wrote:
    > The question remains, if we ever want to do more complex demand-paged
    > operations, should we also expose a lower level set of functions to get
    > struct page out of a dma_alloc_coherent() allocation and to get the
    > pgprot for the user dma mapping ?

    I don't think so - that places the requirement that dma_alloc_coherent()
    must be backed by memory with a set of struct page, which may not always
    be the case.

    Think about dma_alloc_coherent() with dma_declare_coherent_memory() used
    with memory which is not part of system RAM.


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