x86: move dma_cache_sync to common header

they are the same in both architectures.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-x86/dma-mapping.h

@@ -185,4 +185,10 @@ static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 	dma_unmap_single(dev, addr, size, direction);
 }
 
+static inline void
+dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+	enum dma_data_direction dir)
+{
+	flush_write_buffers();
+}
 #endif

include/asm-x86/dma-mapping_32.h

@@ -55,13 +55,6 @@ dma_get_cache_alignment(void)
 
 #define dma_is_consistent(d, h)	(1)
 
-static inline void
-dma_cache_sync(struct device *dev, void *vaddr, size_t size,
-	       enum dma_data_direction direction)
-{
-	flush_write_buffers();
-}
-
 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 extern int
 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,

include/asm-x86/dma-mapping_64.h

@@ -24,13 +24,6 @@ static inline int dma_get_cache_alignment(void)
 
 extern int dma_set_mask(struct device *dev, u64 mask);
 
-static inline void
-dma_cache_sync(struct device *dev, void *vaddr, size_t size,
-	enum dma_data_direction dir)
-{
-	flush_write_buffers();
-}
-
 extern struct device fallback_dev;
 extern int panic_on_overflow;