Update arch/ to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c
index 9001104b..14206e3 100644
--- a/arch/powerpc/kernel/dma_64.c
+++ b/arch/powerpc/kernel/dma_64.c
@@ -161,8 +161,7 @@
 	int i;
 
 	for_each_sg(sgl, sg, nents, i) {
-		sg->dma_address = (page_to_phys(sg->page) + sg->offset) |
-			dma_direct_offset;
+		sg->dma_address = sg_phys(sg) | dma_direct_offset;
 		sg->dma_length = sg->length;
 	}