Commit fa3d319a authored Jun 26, 2008 by Pavel Machek Committed by Ingo Molnar Jun 26, 2008

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>

parent 037a6079

arch/x86/kernel/pci-gart_64.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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)