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    SubjectRe: [patch 4/5] mm: add vm_insert_pfn helpler
    On Wed, Oct 11, 2006 at 12:12:19PM +0200, Thomas Hellstrom wrote:
    > Nick, I just realized: would it be possible to have a pgprot_t argument
    > to this one, instead of it using vma->vm_pgprot?
    >
    > The motivation for this (DRM again) is that some architectures (powerpc)
    > cannot map the AGP aperture through IO space, but needs to remap the
    > page from memory with a nocache attribute set. Others need special
    > pgprot settings for write-combined mappings.
    >
    > Now, there's a possibility to change vma->vm_pgprot during the first
    > ->fault(), but again, we only have the mmap_sem in read mode.

    I don't see a problem with that. It would be nice if vm_pgprot could
    be kept in synch with the pte protections, but I guess a crazy
    driver should be allowed to do anything it wants ;)


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