Introduce the dma_flags_set_attr() interface and give it a default 
no-op implementation.

Signed-off-by: Arthur Kepner <akepner@sgi.com>

---

 dma-mapping.h |    8 ++++++++
 1 files changed, 8 insertions(+)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 2dc21cb..4990aaf 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -99,4 +99,12 @@ static inline void dmam_release_declared_memory(struct device *dev)
 }
 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 
+#define DMA_BARRIER_ATTR	0x1
+#ifndef ARCH_USES_DMA_ATTRS
+static inline int dma_flags_set_attr(u32 attr, enum dma_data_direction dir) 
+{
+	return dir;
+}
+#endif /* ARCH_USES_DMA_ATTRS */
+
 #endif
-
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