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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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      Last update: 2008-05-26 20:49    [W:0.017 / U:5.252 seconds]
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