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    SubjectRe: [Linaro-mm-sig] [RFC v2 1/2] dma-buf: Introduce dma buffer sharing mechanism
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    On Fri, Dec 23, 2011 at 4:00 AM, Semwal, Sumit <sumit.semwal@ti.com> wrote:
    > On Wed, Dec 21, 2011 at 10:57 PM, Arnd Bergmann <arnd@arndb.de> wrote:
    >> On Tuesday 20 December 2011, Daniel Vetter wrote:
    >>> > I'm thinking for a first version, we can get enough mileage out of it by saying:
    >>> > 1) only exporter can mmap to userspace
    >>> > 2) only importers that do not need CPU access to buffer..
    >
    > Thanks Rob - and the exporter can do the mmap outside of dma-buf
    > usage, right?

    Yes

    > I mean, we don't need to provide an mmap to dma_buf()
    > and restrict it to exporter, when the exporter has more 'control' of
    > the buffer anyways.

    No, if it is only for the exporter, it really doesn't need to be in
    dmabuf (ie. the exporter already knows how he is)

    BR,
    -R

    >>
    > BR,
    > ~Sumit.


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