Messages in this thread | | | Date | Wed, 11 Oct 2006 13:24:36 +0200 | From | Nick Piggin <> | Subject | Re: [patch 4/5] mm: add vm_insert_pfn helpler |
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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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