[PATCH] [9/12] GBPAGES: Switch pci-gart over to using cpa instead of clear_kernel_mapping

[Andi Kleen]

pci-gart needs to unmap the IOMMU aperture to prevent cache corruptions.

Switch this over to using cpa instead of clear_kernel_mapping()

Drawback right now is that cpa will split everything down to 4k
pages, and this costs 4K for each 2MB of aperture; 128KB for a typical
64MB aperture.

Signed-off-by: Andi Kleen <ak@xxxxxxx>

---
 arch/x86/kernel/pci-gart_64.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux/arch/x86/kernel/pci-gart_64.c
===================================================================
--- linux.orig/arch/x86/kernel/pci-gart_64.c
+++ linux/arch/x86/kernel/pci-gart_64.c
@@ -731,7 +731,8 @@ void __init gart_iommu_init(void)
 	 * the backing memory. The GART address is only used by PCI
 	 * devices.
 	 */
-	clear_kernel_mapping((unsigned long)__va(iommu_bus_base), iommu_size);
+	set_memory_np((unsigned long)__va(iommu_bus_base),
+				iommu_size >> PAGE_SHIFT);
 
 	/*
 	 * Try to workaround a bug (thanks to BenH)
--
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