diff --git a/include/asm-arm/arch-cl7500/vmalloc.h b/include/asm-arm/arch-cl7500/vmalloc.h
index 91883de..ba8d7a8 100644
--- a/include/asm-arm/arch-cl7500/vmalloc.h
+++ b/include/asm-arm/arch-cl7500/vmalloc.h
@@ -1,15 +1,4 @@
 /*
  * linux/include/asm-arm/arch-cl7500/vmalloc.h
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x1c000000)
diff --git a/include/asm-arm/arch-clps711x/vmalloc.h b/include/asm-arm/arch-clps711x/vmalloc.h
index 42571ed..a5dfe96 100644
--- a/include/asm-arm/arch-clps711x/vmalloc.h
+++ b/include/asm-arm/arch-clps711x/vmalloc.h
@@ -17,15 +17,4 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
diff --git a/include/asm-arm/arch-ebsa110/vmalloc.h b/include/asm-arm/arch-ebsa110/vmalloc.h
index 759659b..26674ba 100644
--- a/include/asm-arm/arch-ebsa110/vmalloc.h
+++ b/include/asm-arm/arch-ebsa110/vmalloc.h
@@ -7,15 +7,4 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x1f000000)
diff --git a/include/asm-arm/arch-ebsa285/vmalloc.h b/include/asm-arm/arch-ebsa285/vmalloc.h
index def705a..d1ca955 100644
--- a/include/asm-arm/arch-ebsa285/vmalloc.h
+++ b/include/asm-arm/arch-ebsa285/vmalloc.h
@@ -8,17 +8,6 @@
 
 #include <linux/config.h>
 
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-
 #ifdef CONFIG_ARCH_FOOTBRIDGE
 #define VMALLOC_END       (PAGE_OFFSET + 0x30000000)
 #else
diff --git a/include/asm-arm/arch-epxa10db/vmalloc.h b/include/asm-arm/arch-epxa10db/vmalloc.h
index d31ef85..546fb7d 100644
--- a/include/asm-arm/arch-epxa10db/vmalloc.h
+++ b/include/asm-arm/arch-epxa10db/vmalloc.h
@@ -17,15 +17,4 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
diff --git a/include/asm-arm/arch-h720x/vmalloc.h b/include/asm-arm/arch-h720x/vmalloc.h
index 4af523a..b4693cb 100644
--- a/include/asm-arm/arch-h720x/vmalloc.h
+++ b/include/asm-arm/arch-h720x/vmalloc.h
@@ -5,17 +5,6 @@
 #ifndef __ARCH_ARM_VMALLOC_H
 #define __ARCH_ARM_VMALLOC_H
 
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
 
 #endif
diff --git a/include/asm-arm/arch-imx/vmalloc.h b/include/asm-arm/arch-imx/vmalloc.h
index 252038f..cb61691 100644
--- a/include/asm-arm/arch-imx/vmalloc.h
+++ b/include/asm-arm/arch-imx/vmalloc.h
@@ -17,16 +17,4 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
diff --git a/include/asm-arm/arch-integrator/vmalloc.h b/include/asm-arm/arch-integrator/vmalloc.h
index 50e9aee..170ccce 100644
--- a/include/asm-arm/arch-integrator/vmalloc.h
+++ b/include/asm-arm/arch-integrator/vmalloc.h
@@ -17,15 +17,4 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
diff --git a/include/asm-arm/arch-iop3xx/vmalloc.h b/include/asm-arm/arch-iop3xx/vmalloc.h
index dc1d2a9..0f2f684 100644
--- a/include/asm-arm/arch-iop3xx/vmalloc.h
+++ b/include/asm-arm/arch-iop3xx/vmalloc.h
@@ -10,9 +10,6 @@
  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  * area for the same reason. ;)
  */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
 //#define VMALLOC_END       (0xe8000000)
 /* increase usable physical RAM to ~992M per RMK */
 #define VMALLOC_END       (0xfe000000)
diff --git a/include/asm-arm/arch-ixp2000/vmalloc.h b/include/asm-arm/arch-ixp2000/vmalloc.h
index 2e4bcbc..473dff4 100644
--- a/include/asm-arm/arch-ixp2000/vmalloc.h
+++ b/include/asm-arm/arch-ixp2000/vmalloc.h
@@ -17,7 +17,4 @@
  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  * area for the same reason. ;)
  */
-#define VMALLOC_OFFSET	    (8*1024*1024)
-#define VMALLOC_START	    (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x)   ((unsigned long)(x))
 #define VMALLOC_END	    0xfaffefff
diff --git a/include/asm-arm/arch-ixp4xx/vmalloc.h b/include/asm-arm/arch-ixp4xx/vmalloc.h
index da46e56..050d46e 100644
--- a/include/asm-arm/arch-ixp4xx/vmalloc.h
+++ b/include/asm-arm/arch-ixp4xx/vmalloc.h
@@ -1,17 +1,5 @@
 /*
  * linux/include/asm-arm/arch-ixp4xx/vmalloc.h
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
 #define VMALLOC_END       (0xFF000000)
 
diff --git a/include/asm-arm/arch-l7200/vmalloc.h b/include/asm-arm/arch-l7200/vmalloc.h
index edeaebe..816231e 100644
--- a/include/asm-arm/arch-l7200/vmalloc.h
+++ b/include/asm-arm/arch-l7200/vmalloc.h
@@ -1,15 +1,4 @@
 /*
  * linux/include/asm-arm/arch-l7200/vmalloc.h
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
diff --git a/include/asm-arm/arch-lh7a40x/vmalloc.h b/include/asm-arm/arch-lh7a40x/vmalloc.h
index 5ac6079..8163e45 100644
--- a/include/asm-arm/arch-lh7a40x/vmalloc.h
+++ b/include/asm-arm/arch-lh7a40x/vmalloc.h
@@ -7,15 +7,4 @@
  *  version 2 as published by the Free Software Foundation.
  *
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after
- * the physical memory until the kernel virtual memory starts.  That
- * means that any out-of-bounds memory accesses will hopefully be
- * caught.  The vmalloc() routines leaves a hole of 4kB (one page)
- * between each vmalloced area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (0xe8000000)
diff --git a/include/asm-arm/arch-omap/vmalloc.h b/include/asm-arm/arch-omap/vmalloc.h
index c6a8358..5b8bd8d 100644
--- a/include/asm-arm/arch-omap/vmalloc.h
+++ b/include/asm-arm/arch-omap/vmalloc.h
@@ -17,17 +17,5 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
 #define VMALLOC_END	  (PAGE_OFFSET + 0x10000000)
 
diff --git a/include/asm-arm/arch-pxa/vmalloc.h b/include/asm-arm/arch-pxa/vmalloc.h
index 3381af6..5bb450c 100644
--- a/include/asm-arm/arch-pxa/vmalloc.h
+++ b/include/asm-arm/arch-pxa/vmalloc.h
@@ -8,15 +8,4 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (0xe8000000)
diff --git a/include/asm-arm/arch-rpc/vmalloc.h b/include/asm-arm/arch-rpc/vmalloc.h
index a13c27f..077046b 100644
--- a/include/asm-arm/arch-rpc/vmalloc.h
+++ b/include/asm-arm/arch-rpc/vmalloc.h
@@ -7,15 +7,4 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x1c000000)
diff --git a/include/asm-arm/arch-s3c2410/vmalloc.h b/include/asm-arm/arch-s3c2410/vmalloc.h
index 5fe72ad..33963cd 100644
--- a/include/asm-arm/arch-s3c2410/vmalloc.h
+++ b/include/asm-arm/arch-s3c2410/vmalloc.h
@@ -19,18 +19,6 @@
 #ifndef __ASM_ARCH_VMALLOC_H
 #define __ASM_ARCH_VMALLOC_H
 
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
 #define VMALLOC_END	  (0xE0000000)
 
 #endif /* __ASM_ARCH_VMALLOC_H */
diff --git a/include/asm-arm/arch-sa1100/vmalloc.h b/include/asm-arm/arch-sa1100/vmalloc.h
index 135bc94..2fb1c6f 100644
--- a/include/asm-arm/arch-sa1100/vmalloc.h
+++ b/include/asm-arm/arch-sa1100/vmalloc.h
@@ -1,15 +1,4 @@
 /*
  * linux/include/asm-arm/arch-sa1100/vmalloc.h
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (0xe8000000)
diff --git a/include/asm-arm/arch-shark/vmalloc.h b/include/asm-arm/arch-shark/vmalloc.h
index 1cc2009..10db5d1 100644
--- a/include/asm-arm/arch-shark/vmalloc.h
+++ b/include/asm-arm/arch-shark/vmalloc.h
@@ -1,15 +1,4 @@
 /*
  * linux/include/asm-arm/arch-rpc/vmalloc.h
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET	  (8*1024*1024)
-#define VMALLOC_START	  (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END       (PAGE_OFFSET + 0x10000000)
diff --git a/include/asm-arm/arch-versatile/vmalloc.h b/include/asm-arm/arch-versatile/vmalloc.h
index adfb3482..ac780df 100644
--- a/include/asm-arm/arch-versatile/vmalloc.h
+++ b/include/asm-arm/arch-versatile/vmalloc.h
@@ -18,16 +18,4 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-
-/*
- * Just any arbitrary offset to the start of the vmalloc VM area: the
- * current 8MB value just means that there will be a 8MB "hole" after the
- * physical memory until the kernel virtual memory starts.  That means that
- * any out-of-bounds memory accesses will hopefully be caught.
- * The vmalloc() routines leaves a hole of 4kB between each vmalloced
- * area for the same reason. ;)
- */
-#define VMALLOC_OFFSET		(8*1024*1024)
-#define VMALLOC_START		(((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define VMALLOC_VMADDR(x)	((unsigned long)(x))
 #define VMALLOC_END		(PAGE_OFFSET + 0x18000000)
diff --git a/include/asm-arm/pgtable.h b/include/asm-arm/pgtable.h
index 2df4eac..a9892eb 100644
--- a/include/asm-arm/pgtable.h
+++ b/include/asm-arm/pgtable.h
@@ -17,6 +17,23 @@
 #include <asm/arch/vmalloc.h>
 
 /*
+ * Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ *
+ * Note that platforms may override VMALLOC_START, but they must provide
+ * VMALLOC_END.  VMALLOC_END defines the (exclusive) limit of this space,
+ * which may not overlap IO space.
+ */
+#ifndef VMALLOC_START
+#define VMALLOC_OFFSET		(8*1024*1024)
+#define VMALLOC_START		(((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#endif
+
+/*
  * Hardware-wise, we have a two level page table structure, where the first
  * level has 4096 entries, and the second level has 256 entries.  Each entry
  * is one 32-bit word.  Most of the bits in the second level entry are used