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    SubjectRe: mmaping a kernel buffer to user space


    Russell King wrote:
    > On Wed, Nov 01, 2006 at 01:58:17PM +0100, Guillermo Marcus Martinez wrote:
    >> My suggestion would be to add two functions: pci_map_consistent() and
    >> dma_map_coherent() to address this issue, and their corresponding
    >> unmap's. That will make sure all that is needed is done, is a clean and
    >> consistent with the pci_ and dma_ APIs, and fills a mmap requirement not
    >> covered by the other functions.
    >
    > You might want to look through include/asm-arm/dma-mapping.h to see if
    > an architecture already has considered that and the interface they
    > implemented.
    >

    Nice! Thanks. I think the issue of mapping a coherent area to user space
    is fairly general. Should not this be promoted to be part of the general
    dma-api? (that is, not a platform specific function)
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