x86: move dma_map_page and dma_unmap_page to common header

They are similar enough to do this move.
the macro version is ugly, and we use inline functions instead.
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

@@ -169,4 +169,18 @@ dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 
 	flush_write_buffers();
 }
+
+static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
+				      size_t offset, size_t size,
+				      int direction)
+{
+	return dma_map_single(dev, page_address(page)+offset, size, direction);
+}
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
+				  size_t size, int direction)
+{
+	dma_unmap_single(dev, addr, size, direction);
+}
+
 #endif

include/asm-x86/dma-mapping_32.h

@@ -8,21 +8,6 @@
 #include <asm/io.h>
 #include <asm/bug.h>
 
-static inline dma_addr_t
-dma_map_page(struct device *dev, struct page *page, unsigned long offset,
-	     size_t size, enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-	return page_to_phys(page) + offset;
-}
-
-static inline void
-dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
-	       enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-}
-
 static inline int
 dma_mapping_error(dma_addr_t dma_addr)
 {

include/asm-x86/dma-mapping_64.h

@@ -12,10 +12,6 @@ static inline int dma_mapping_error(dma_addr_t dma_addr)
 	return (dma_addr == bad_dma_address);
 }
 
-#define dma_map_page(dev,page,offset,size,dir) \
-	dma_map_single((dev), page_address(page)+(offset), (size), (dir))
-
-#define dma_unmap_page dma_unmap_single
 extern int dma_supported(struct device *hwdev, u64 mask);
 
 /* same for gart, swiotlb, and nommu */