x86: switch pci-gart over to using set_memory_np() instead of clear_kernel_mapping()

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

Switch this over to using set_memory_np() instead of clear_kernel_mapping().

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index ae1d3d8b384d..845cbecd68e9 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/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)