[SPARC32]: Fix build-warning in io-unit.c

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c
index 1666087..b86dfce 100644
--- a/arch/sparc/mm/io-unit.c
+++ b/arch/sparc/mm/io-unit.c
@@ -144,7 +144,7 @@
 	spin_lock_irqsave(&iounit->lock, flags);
 	while (sz != 0) {
 		--sz;
-		sg->dvma_address = iounit_get_area(iounit, sg_virt(sg), sg->length);
+		sg->dvma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
 		sg->dvma_length = sg->length;
 		sg = sg_next(sg);
 	}