From: Rolf Eike Beer <eike-kernel@sf-tec.de>

As suggested by Muli Ben-Yehuda this function is moved to generic code as
may be useful for all archs.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---


diff -puN include/asm-x86_64/dma-mapping.h~move-valid_dma_direction-from-x86_64-to-generic-code include/asm-x86_64/dma-mapping.h
--- a/include/asm-x86_64/dma-mapping.h~move-valid_dma_direction-from-x86_64-to-generic-code
+++ a/include/asm-x86_64/dma-mapping.h
@@ -55,13 +55,6 @@ extern dma_addr_t bad_dma_address;
 extern struct dma_mapping_ops* dma_ops;
 extern int iommu_merge;
 
-static inline int valid_dma_direction(int dma_direction)
-{
-	return ((dma_direction == DMA_BIDIRECTIONAL) ||
-		(dma_direction == DMA_TO_DEVICE) ||
-		(dma_direction == DMA_FROM_DEVICE));
-}
-
 static inline int dma_mapping_error(dma_addr_t dma_addr)
 {
 	if (dma_ops->mapping_error)
diff -puN include/linux/dma-mapping.h~move-valid_dma_direction-from-x86_64-to-generic-code include/linux/dma-mapping.h
--- a/include/linux/dma-mapping.h~move-valid_dma_direction-from-x86_64-to-generic-code
+++ a/include/linux/dma-mapping.h
@@ -24,6 +24,13 @@ enum dma_data_direction {
 #define DMA_28BIT_MASK	0x000000000fffffffULL
 #define DMA_24BIT_MASK	0x0000000000ffffffULL
 
+static inline int valid_dma_direction(int dma_direction)
+{
+	return ((dma_direction == DMA_BIDIRECTIONAL) ||
+		(dma_direction == DMA_TO_DEVICE) ||
+		(dma_direction == DMA_FROM_DEVICE));
+}
+
 #include <asm/dma-mapping.h>
 
 /* Backwards compat, remove in 2.7.x */
_