dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)

Replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)

Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 1c5c8a6..53c7788 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -94,7 +94,7 @@
 	 * done via some global so platforms can set the limit in case
 	 * they have limited DMA windows
 	 */
-	return mask >= DMA_32BIT_MASK;
+	return mask >= DMA_BIT_MASK(32);
 #else
 	return 1;
 #endif