diff --git a/arch/alpha/include/asm/types.h b/arch/alpha/include/asm/types.h
index bd621ecd1eb33a21516af7ac6c3629b0f098e65b..e46e50382d28dbcd782cbf0f4b87b042fef339c7 100644
--- a/arch/alpha/include/asm/types.h
+++ b/arch/alpha/include/asm/types.h
@@ -27,7 +27,6 @@ typedef unsigned int umode_t;
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__
 
-typedef u64 dma_addr_t;
 typedef u64 dma64_addr_t;
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/arm/include/asm/types.h b/arch/arm/include/asm/types.h
index 345df01534a4c9b1fbabab2c84c426c8f3945c6d..c684e3769f4721031e47c97386351c007dbf1519 100644
--- a/arch/arm/include/asm/types.h
+++ b/arch/arm/include/asm/types.h
@@ -18,9 +18,6 @@ typedef unsigned short umode_t;
 
 #ifndef __ASSEMBLY__
 
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
 typedef u32 dma64_addr_t;
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/avr32/include/asm/types.h b/arch/avr32/include/asm/types.h
index 9cefda6f534a19f641cf467a758a0e88c0d900a8..72667a3b1af77822f9a6ea3081adeec188f66f22 100644
--- a/arch/avr32/include/asm/types.h
+++ b/arch/avr32/include/asm/types.h
@@ -23,14 +23,6 @@ typedef unsigned short umode_t;
 
 #define BITS_PER_LONG 32
 
-#ifndef __ASSEMBLY__
-
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
-
-#endif /* __ASSEMBLY__ */
-
 #endif /* __KERNEL__ */
 
 
diff --git a/arch/cris/include/asm/types.h b/arch/cris/include/asm/types.h
index 5790262cbe8ae8c0da682c622e07b0da13606e7d..44055087c932fa7a21d55168736c154fcf77088f 100644
--- a/arch/cris/include/asm/types.h
+++ b/arch/cris/include/asm/types.h
@@ -18,9 +18,6 @@ typedef unsigned short umode_t;
 
 #ifndef __ASSEMBLY__
 
-/* Dma addresses are 32-bits wide, just like our other addresses.  */
- 
-typedef u32 dma_addr_t;
 typedef u32 dma64_addr_t;
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/frv/include/asm/types.h b/arch/frv/include/asm/types.h
index 613bf1e962f07b08fdef6b512b0cfd87da468791..aa3e7fdc7f29ecea5b1ff5e569100e463c9e4c82 100644
--- a/arch/frv/include/asm/types.h
+++ b/arch/frv/include/asm/types.h
@@ -27,14 +27,6 @@ typedef unsigned short umode_t;
 
 #define BITS_PER_LONG 32
 
-#ifndef __ASSEMBLY__
-
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
-
-#endif /* __ASSEMBLY__ */
-
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_TYPES_H */
diff --git a/arch/h8300/include/asm/types.h b/arch/h8300/include/asm/types.h
index 12875190b156647b430033ff61b7894b14e3f53b..bb2c91a3522e71c185ab6bfb58ff915b5d1ac9f3 100644
--- a/arch/h8300/include/asm/types.h
+++ b/arch/h8300/include/asm/types.h
@@ -22,10 +22,6 @@ typedef unsigned short umode_t;
 
 #define BITS_PER_LONG 32
 
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
-
 #endif /* __KERNEL__ */
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/ia64/include/asm/types.h b/arch/ia64/include/asm/types.h
index 93773fd37be0fec66fbc10f702da8aad4c91f62c..82b3939d2718fe80698b8ce04924fdafc7cf42d6 100644
--- a/arch/ia64/include/asm/types.h
+++ b/arch/ia64/include/asm/types.h
@@ -40,9 +40,6 @@ struct fnptr {
 	unsigned long gp;
 };
 
-/* DMA addresses are 64-bits wide, in general.  */
-typedef u64 dma_addr_t;
-
 # endif /* __KERNEL__ */
 #endif /* !__ASSEMBLY__ */
 
diff --git a/arch/m32r/include/asm/types.h b/arch/m32r/include/asm/types.h
index bc9f7fff0ac399da986bfc54bba6003aa9828b07..fd84b4898e30e027dc4886ac0b0cdc49352a2801 100644
--- a/arch/m32r/include/asm/types.h
+++ b/arch/m32r/include/asm/types.h
@@ -18,9 +18,6 @@ typedef unsigned short umode_t;
 
 #ifndef __ASSEMBLY__
 
-/* DMA addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
 typedef u64 dma64_addr_t;
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/m68k/include/asm/types.h b/arch/m68k/include/asm/types.h
index 6441cb5f8e7c84765716a782c0974a5d692f1b3a..10ad92f1c173318eef0d9ae4d8a4c7bedabc1ad5 100644
--- a/arch/m68k/include/asm/types.h
+++ b/arch/m68k/include/asm/types.h
@@ -25,9 +25,6 @@ typedef unsigned short umode_t;
 
 #ifndef __ASSEMBLY__
 
-/* DMA addresses are always 32-bits wide */
-
-typedef u32 dma_addr_t;
 typedef u32 dma64_addr_t;
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/mips/include/asm/types.h b/arch/mips/include/asm/types.h
index 544a2854598f0d6558269beb298fe839e161ea08..9520dc8949896f4b71c4504493dcd221505a0ddb 100644
--- a/arch/mips/include/asm/types.h
+++ b/arch/mips/include/asm/types.h
@@ -33,12 +33,6 @@ typedef unsigned short umode_t;
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__
 
-#if (defined(CONFIG_HIGHMEM) && defined(CONFIG_64BIT_PHYS_ADDR)) \
-    || defined(CONFIG_64BIT)
-typedef u64 dma_addr_t;
-#else
-typedef u32 dma_addr_t;
-#endif
 typedef u64 dma64_addr_t;
 
 /*
diff --git a/arch/mn10300/include/asm/types.h b/arch/mn10300/include/asm/types.h
index 7b9f01042fd4e6da98f59a1fbc91e586470a4ea6..c1833eb192e3f2fb2e83c91c0e71b52b108ed0df 100644
--- a/arch/mn10300/include/asm/types.h
+++ b/arch/mn10300/include/asm/types.h
@@ -26,13 +26,6 @@ typedef unsigned short umode_t;
 
 #define BITS_PER_LONG 32
 
-#ifndef __ASSEMBLY__
-
-/* Dma addresses are 32-bits wide.  */
-typedef u32 dma_addr_t;
-
-#endif /* __ASSEMBLY__ */
-
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_TYPES_H */
diff --git a/arch/parisc/include/asm/types.h b/arch/parisc/include/asm/types.h
index 20135cc8003924dc688d1abd52e064fbbf317fd5..bc164ddffb782090c05847608fc7354a736ce99a 100644
--- a/arch/parisc/include/asm/types.h
+++ b/arch/parisc/include/asm/types.h
@@ -16,9 +16,6 @@ typedef unsigned short umode_t;
 
 #ifndef __ASSEMBLY__
 
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
 typedef u64 dma64_addr_t;
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/powerpc/include/asm/types.h b/arch/powerpc/include/asm/types.h
index a5aea0ca34e9a3dc98fdf4b504cc56e472baad87..e16a6b2d96f194ab84157b477636103d6acf64e6 100644
--- a/arch/powerpc/include/asm/types.h
+++ b/arch/powerpc/include/asm/types.h
@@ -44,11 +44,6 @@ typedef struct {
 
 typedef __vector128 vector128;
 
-#if defined(__powerpc64__) || defined(CONFIG_PHYS_64BIT)
-typedef u64 dma_addr_t;
-#else
-typedef u32 dma_addr_t;
-#endif
 typedef u64 dma64_addr_t;
 
 typedef struct {
diff --git a/arch/s390/include/asm/types.h b/arch/s390/include/asm/types.h
index 04d6b95a89c6b4ce1c5454341d378ea45700e286..f7f6ae6bed8f4a47cc0acec2c73cde95fa3a2af4 100644
--- a/arch/s390/include/asm/types.h
+++ b/arch/s390/include/asm/types.h
@@ -31,12 +31,6 @@ typedef __signed__ long saddr_t;
 #ifndef __ASSEMBLY__
 
 typedef u64 dma64_addr_t;
-#ifdef __s390x__
-/* DMA addresses come in 32-bit and 64-bit flavours. */
-typedef u64 dma_addr_t;
-#else
-typedef u32 dma_addr_t;
-#endif
 
 #ifndef __s390x__
 typedef union {
diff --git a/arch/sparc/include/asm/types.h b/arch/sparc/include/asm/types.h
index 09c79a9c85166a0c11fd5d45e38035b8611b13dd..f02d330cb9f175b71e33d7cf1c3b51c5c8bb6cec 100644
--- a/arch/sparc/include/asm/types.h
+++ b/arch/sparc/include/asm/types.h
@@ -22,10 +22,6 @@ typedef unsigned short umode_t;
 
 #ifndef __ASSEMBLY__
 
-/* Dma addresses come in generic and 64-bit flavours.  */
-
-typedef u32 dma_addr_t;
-
 #if defined(__arch64__)
 
 /*** SPARC 64 bit ***/
diff --git a/arch/x86/include/asm/types.h b/arch/x86/include/asm/types.h
index df1da20f453476635f8dd244cd690451c39b4c13..88102055a4b891b9af54bf9739982a821a159405 100644
--- a/arch/x86/include/asm/types.h
+++ b/arch/x86/include/asm/types.h
@@ -1,20 +1,12 @@
 #ifndef _ASM_X86_TYPES_H
 #define _ASM_X86_TYPES_H
 
-#define dma_addr_t	dma_addr_t
-
 #include <asm-generic/types.h>
 
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__
 
 typedef u64 dma64_addr_t;
-#if defined(CONFIG_X86_64) || defined(CONFIG_HIGHMEM64G)
-/* DMA addresses come in 32-bit and 64-bit flavours. */
-typedef u64 dma_addr_t;
-#else
-typedef u32 dma_addr_t;
-#endif
 
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
diff --git a/arch/xtensa/include/asm/types.h b/arch/xtensa/include/asm/types.h
index c89569a8da0cec6f2c664d073aa0010d265825ea..b1c981e39b52b1544a1dac3b0e4cc22f2510c36e 100644
--- a/arch/xtensa/include/asm/types.h
+++ b/arch/xtensa/include/asm/types.h
@@ -32,10 +32,6 @@ typedef unsigned short umode_t;
 
 #define BITS_PER_LONG 32
 
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
-
 #endif	/* __KERNEL__ */
 #endif
 
diff --git a/include/asm-generic/types.h b/include/asm-generic/types.h
index fba7d33ca3f2b98eafcaf579a1b6244301df8b22..7a0f69e6c618d6f52c6b6a57ad0318532259590c 100644
--- a/include/asm-generic/types.h
+++ b/include/asm-generic/types.h
@@ -12,31 +12,4 @@ typedef unsigned short umode_t;
 
 #endif /* __ASSEMBLY__ */
 
-/*
- * These aren't exported outside the kernel to avoid name space clashes
- */
-#ifdef __KERNEL__
-#ifndef __ASSEMBLY__
-/*
- * DMA addresses may be very different from physical addresses
- * and pointers. i386 and powerpc may have 64 bit DMA on 32 bit
- * systems, while sparc64 uses 32 bit DMA addresses for 64 bit
- * physical addresses.
- * This default defines dma_addr_t to have the same size as
- * phys_addr_t, which is the most common way.
- * Do not define the dma64_addr_t type, which never really
- * worked.
- */
-#ifndef dma_addr_t
-#ifdef CONFIG_PHYS_ADDR_T_64BIT
-typedef u64 dma_addr_t;
-#else
-typedef u32 dma_addr_t;
-#endif /* CONFIG_PHYS_ADDR_T_64BIT */
-#endif /* dma_addr_t */
-
-#endif /* __ASSEMBLY__ */
-
-#endif /* __KERNEL__ */
-
 #endif /* _ASM_GENERIC_TYPES_H */
diff --git a/include/linux/types.h b/include/linux/types.h
index c2a9eb44f2fa974cc7ac15a35ae9c184c1e6773f..176da8c1fbb180e20a925ba79e80420bdf66b7a9 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -150,6 +150,12 @@ typedef unsigned long blkcnt_t;
 #define pgoff_t unsigned long
 #endif
 
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+typedef u64 dma_addr_t;
+#else
+typedef u32 dma_addr_t;
+#endif /* dma_addr_t */
+
 #endif /* __KERNEL__ */
 
 /*