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    SubjectRe: can device drivers return non-ram via vm_ops->nopage?
    David Woodhouse wrote:
    > On Sun, 2004-03-21 at 17:34 -0500, Jeff Garzik wrote:
    >
    >>Tell driver writers to call a standard platform function with a
    >>{dma|mmio|pio|vmalloc} handle+size+len for {dma|mmio|pio|vmalloc} mmap
    >>setup, and {fault|nopage} handler. ;-) IMO they shouldn't have to care
    >>about the details.
    >
    >
    > Don't let drivers see the {fault|nopage} handler. On most arches it can
    > probably continue to be nopage(); other arches may use the
    > newly-proposed fault() or perhaps just put all the PTEs in place up
    > front. The driver shouldn't be given an opportunity to care.

    If that's possible within the MM APIs... certainly. Have a standard
    struct vm_operations_struct for dma, dma s/g, mmio, ... I presume?

    Jeff



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