diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 1c88ce6b50d62cdbbe70286fa7ecdc961de80602..914846d0beaaa9dab1fbd862505b4d7832b747cd 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -11,6 +11,9 @@
 #include <asm/swiotlb.h>
 
 extern dma_addr_t bad_dma_address;
+extern int iommu_merge;
+extern struct device fallback_dev;
+extern int panic_on_overflow;
 
 struct dma_mapping_ops {
 	int             (*mapping_error)(dma_addr_t dma_addr);
@@ -75,12 +78,6 @@ void dma_free_coherent(struct device *dev, size_t size,
 extern int dma_supported(struct device *hwdev, u64 mask);
 extern int dma_set_mask(struct device *dev, u64 mask);
 
-#ifdef CONFIG_X86_32
-# include "dma-mapping_32.h"
-#else
-# include "dma-mapping_64.h"
-#endif
-
 static inline dma_addr_t
 dma_map_single(struct device *hwdev, void *ptr, size_t size,
 	       int direction)
@@ -205,6 +202,15 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 	flush_write_buffers();
 }
 
+static inline int dma_get_cache_alignment(void)
+{
+	/* no easy way to get cache size on all x86, so return the
+	 * maximum possible, to be safe */
+	return boot_cpu_data.x86_clflush_size;
+}
+
+#define dma_is_consistent(d, h)	(1)
+
 #ifdef CONFIG_X86_32
 #  define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 extern int
@@ -217,5 +223,6 @@ dma_release_declared_memory(struct device *dev);
 extern void *
 dma_mark_declared_memory_occupied(struct device *dev,
 				  dma_addr_t device_addr, size_t size);
+extern int forbid_dac;
 #endif /* CONFIG_X86_32 */
 #endif
diff --git a/include/asm-x86/dma-mapping_32.h b/include/asm-x86/dma-mapping_32.h
deleted file mode 100644
index 4ec4f45446cf7250cce64d05f8b0f25c924f02e6..0000000000000000000000000000000000000000
--- a/include/asm-x86/dma-mapping_32.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#ifndef _ASM_I386_DMA_MAPPING_H
-#define _ASM_I386_DMA_MAPPING_H
-
-#include <linux/mm.h>
-#include <linux/scatterlist.h>
-
-#include <asm/cache.h>
-#include <asm/io.h>
-#include <asm/bug.h>
-
-extern int forbid_dac;
-
-static inline int
-dma_get_cache_alignment(void)
-{
-	/* no easy way to get cache size on all x86, so return the
-	 * maximum possible, to be safe */
-	return boot_cpu_data.x86_clflush_size;
-}
-
-#define dma_is_consistent(d, h)	(1)
-
-#endif
diff --git a/include/asm-x86/dma-mapping_64.h b/include/asm-x86/dma-mapping_64.h
deleted file mode 100644
index 8353025f052d57485d253bd143b1f061bbab68b8..0000000000000000000000000000000000000000
--- a/include/asm-x86/dma-mapping_64.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef _X8664_DMA_MAPPING_H
-#define _X8664_DMA_MAPPING_H 1
-
-extern int iommu_merge;
-
-/* same for gart, swiotlb, and nommu */
-static inline int dma_get_cache_alignment(void)
-{
-	return boot_cpu_data.x86_clflush_size;
-}
-
-#define dma_is_consistent(d, h) 1
-
-extern struct device fallback_dev;
-extern int panic_on_overflow;
-
-#endif /* _X8664_DMA_MAPPING_H */