[PATCH 1/3] dma: introduce no-op stub "dma_flags_set_dmaflush"

[akepner]

Introduce a no-op stub function "dma_flags_set_dmaflush". Arches 
can override this if necessary to associate a "dmaflush" attribute
with a DMA-able memory region. In-flight DMA will be flushed to 
host memory when a memory region with the dmaflush attribute is 
written to.

Signed-off-by: Arthur Kepner <akepner@xxxxxxx>
-- 
 dma-mapping.h |    7 +++++++
 1 files changed, 7 insertions(+)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 2dc21cb..594a651 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -99,4 +99,11 @@ static inline void dmam_release_declared_memory(struct device *dev)
 }
 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 
+#ifndef ARCH_DOES_POSTED_DMA
+static inline int
+dma_flags_set_dmaflush(int dir) {
+	return (dir);
+}
+#endif /* ARCH_DOES_POSTED_DMA */
+
 #endif
-- 
Arthur

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