Fix compile warning.

Sponsored by:	Mellanox Technologies

diff --git a/sys/ofed/include/linux/dma-mapping.h b/sys/ofed/include/linux/dma-mapping.h
index f9fc3cb095b19e6eb8fbf68b4352be9ee3c1536c..3af3e227be0109599ab2df224fc76198685a36c6 100644 (file)
--- a/sys/ofed/include/linux/dma-mapping.h
+++ b/sys/ofed/include/linux/dma-mapping.h
@@ -87,7 +87,7 @@ struct dma_map_ops {
        int is_phys;
 };
 
-#define        DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL << (n)) - 1))
+#define        DMA_BIT_MASK(n) ((2ULL << ((n) - 1)) - 1ULL)
 
 static inline int
 dma_supported(struct device *dev, u64 mask)