Update arch/ to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/arch/x86/kernel/pci-nommu_64.c b/arch/x86/kernel/pci-nommu_64.c
index e85d436..faf70bd 100644
--- a/arch/x86/kernel/pci-nommu_64.c
+++ b/arch/x86/kernel/pci-nommu_64.c
@@ -62,8 +62,8 @@
 	int i;
 
 	for_each_sg(sg, s, nents, i) {
-		BUG_ON(!s->page);
-		s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
+		BUG_ON(!sg_page(s));
+		s->dma_address = virt_to_bus(sg_virt(s));
 		if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
 			return 0;
 		s->dma_length = s->length;