Messages in this thread | | | Date | Thu, 6 Jan 2005 16:41:59 -0500 | From | Dave Jones <> | Subject | Re: chasing the four level page table |
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On Thu, Jan 06, 2005 at 03:05:49PM -0500, Jon Smirl wrote: > On 6 Jan 2005 20:38:27 +0100, Andi Kleen <ak@muc.de> wrote: > > You can't use get_user_pages in this case because the AGP aperture > > can be above mem_map. If none of the callers take page_table_lock > > already you would need to add that too. I guess from the context the lock > > is not taken, but better double check. > > > > Perhaps we should add a get_user_phys() or somesuch for this. > > No where in DRM is page_table_lock being taken. Also, no other device > driver takes page_table_lock either, so that probably implies that DRM > shouldn't start doing it to.
No other device driver is also doing such lowlevel stuff with page tables directly afaics. drivers/char/drm seem to be the only drivers using [pgd|pmd|pte]_offset() routines.
Dave
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