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authorPavel Machek <pavel@suse.cz>2008-06-26 00:25:43 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-26 15:17:18 +0200
commitfa3d319ac6f648dc51cb672a31f482c80a8c2457 (patch)
tree1bf747998cc0b0b3b09bed3e0cac3f13162f0bf5 /arch
parent037a6079eb925f7653bddf1501f777abcd4fc91e (diff)
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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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/pci-gart_64.c4
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)