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SubjectRe: pci-gart_64.c: could we get better explanation?
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On Mon, 2008-05-26 at 20:47 +0200, Pavel Machek wrote:
> Hi!
>
> +++ b/arch/x86/kernel/pci-gart_64.c
> @@ -774,6 +778,7 @@ #endif
>
> /*
> * Try to workaround a bug (thanks to BenH)
> * Set unmapped entries to a scratch page instead of 0.
> * Any prefetches that hit unmapped entries won't get an bus abort
>
> Could someone explain? Which bug is being worked around? CPUs
> prefetching over NULL?

P2P bridge prefetching on DMA reads.

Ben.




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