From: Andrew Morton <akpm@linux-foundation.org>

jermy fix tit 4 me

Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


diff -puN include/linux/dma-mapping.h~stop-using-dma_xxbit_mask-fix include/linux/dma-mapping.h
--- a/include/linux/dma-mapping.h~stop-using-dma_xxbit_mask-fix
+++ a/include/linux/dma-mapping.h
@@ -13,7 +13,7 @@ enum dma_data_direction {
 	DMA_NONE = 3,
 };
 
-#define DMA_BIT_MASK(n)	((1ULL<<(n))-1)
+#define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 
 /*
  * NOTE: do not use the below macros in new code and do not add new definitions
@@ -21,7 +21,7 @@ enum dma_data_direction {
  *
  * Instead, just open-code DMA_BIT_MASK(n) within your driver
  */
-#define DMA_64BIT_MASK	(~0ULL)
+#define DMA_64BIT_MASK	DMA_BIT_MASK(64)
 #define DMA_48BIT_MASK	DMA_BIT_MASK(48)
 #define DMA_47BIT_MASK	DMA_BIT_MASK(47)
 #define DMA_40BIT_MASK	DMA_BIT_MASK(40)
_