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    SubjectRE: [PATCH 7/7] ARM: integrate CMA with DMA-mapping subsystem

    On Thursday, October 06, 2011 3:55 PM Marek Szyprowski wrote:

    > This patch adds support for CMA to dma-mapping subsystem for ARM
    > architecture. By default a global CMA area is used, but specific devices
    > are allowed to have their private memory areas if required (they can be
    > created with dma_declare_contiguous() function during board
    > initialization).
    > Contiguous memory areas reserved for DMA are remapped with 2-level page
    > tables on boot. Once a buffer is requested, a low memory kernel mapping
    > is updated to to match requested memory access type.
    > GFP_ATOMIC allocations are performed from special pool which is created
    > early during boot. This way remapping page attributes is not needed on
    > allocation time.
    > CMA has been enabled unconditionally for ARMv6+ systems.
    > Signed-off-by: Marek Szyprowski <>
    > Signed-off-by: Kyungmin Park <>

    Please ignore this patch. The patch named as "[PATCH 8/9] ARM: integrate
    CMA with DMA-mapping subsystem" in this thread is the correct one.

    Best regards
    Marek Szyprowski
    Samsung Poland R&D Center

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