Index: linux-2.6.21.7/drivers/mtd/devices/block2mtd.c
===================================================================
--- linux-2.6.21.7.orig/drivers/mtd/devices/block2mtd.c
+++ linux-2.6.21.7/drivers/mtd/devices/block2mtd.c
@@ -112,7 +112,7 @@ static int _block2mtd_erase(struct block
 		if (IS_ERR(page))
 			return PTR_ERR(page);
 
-		max = (u_long*)page_address(page) + PAGE_SIZE;
+		max = (u_long*) ((u8 *) page_address(page) + PAGE_SIZE);
 		for (p=(u_long*)page_address(page); p<max; p++)
 			if (*p != -1UL) {
 				lock_page(page);
