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

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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