[PATCH] x86-64: dma_ops as const

The dma_ops structure can be const since it never changes
after boot.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index 0bae862..0a762e1 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -556,7 +556,7 @@
 
 extern int agp_amd64_init(void);
 
-static struct dma_mapping_ops gart_dma_ops = {
+static const struct dma_mapping_ops gart_dma_ops = {
 	.mapping_error = NULL,
 	.map_single = gart_map_single,
 	.map_simple = gart_map_simple,