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| author | Pavel Machek <pavel@suse.cz> | 2008-06-26 00:25:43 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-26 15:17:18 +0200 |
| commit | fa3d319ac6f648dc51cb672a31f482c80a8c2457 (patch) | |
| tree | 1bf747998cc0b0b3b09bed3e0cac3f13162f0bf5 | |
| parent | 037a6079eb925f7653bddf1501f777abcd4fc91e (diff) | |
| download | linux-fa3d319ac6f648dc51cb672a31f482c80a8c2457.tar.gz linux-fa3d319ac6f648dc51cb672a31f482c80a8c2457.tar.bz2 linux-fa3d319ac6f648dc51cb672a31f482c80a8c2457.zip | |
pci-gart_64.c: could we get better explanation?
Add better explanation to pci-gart.
Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Trivial patch monkey <trivial@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/pci-gart_64.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index f505c3890358..f20c20a7853d 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -824,10 +824,10 @@ void __init gart_iommu_init(void) wbinvd(); /* - * Try to workaround a bug (thanks to BenH) + * 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 - * then. + * then. (P2P bridge may be prefetching on DMA reads). */ scratch = get_zeroed_page(GFP_KERNEL); if (!scratch) |