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    Subject[RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_* routines

    The following patchset allows additional "attributes" to be
    passed to dma_map_*/dma_unmap_* implementations. (The reason
    why this is useful/necessary has been mentioned several times,
    most recently here:
    http://marc.info/?l=linux-kernel&m=119258541412724&w=2.)

    This is incomplete in that only ia64 and x86_64 are supported -
    the purpose is mainly to give us something specific to discuss.

    The approach here is to change the dma_map_* interface so
    that the last argument is an u32 which encodes the direction
    of the dma and, optionally, other attributes. Changing the
    interface is a bit intrusive, but callers of dma_map_* don't
    need to be modified.

    There are 3 patches:

    [1/3] dma: create linux/dma-direction.h
    [2/3] dma: ia64/sn2 allow "attributes" to be used by dma_map_*
    [2/3] dma: x86_64 allow "attributes" to be used by dma_map_*

    --
    Arthur



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