Update arch/ to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c
index 94d7b11..a16cb03 100644
--- a/arch/blackfin/kernel/dma-mapping.c
+++ b/arch/blackfin/kernel/dma-mapping.c
@@ -160,8 +160,7 @@
 	BUG_ON(direction == DMA_NONE);
 
 	for (i = 0; i < nents; i++, sg++) {
-		sg->dma_address = (dma_addr_t)(page_address(sg->page) +
-					sg->offset);
+		sg->dma_address = (dma_addr_t) sg_virt(sg);
 
 		invalidate_dcache_range(sg_dma_address(sg),
 					sg_dma_address(sg) +