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Subjectpci-gart_64.c: could we get better explanation?

+++ 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?
(cesky, pictures)

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