diff -Naur ./arch/i386/Kconfig ../linux-2.6.9-mdb/./arch/i386/Kconfig
--- ./arch/i386/Kconfig	2004-10-18 15:53:22.000000000 -0600
+++ ../linux-2.6.9-mdb/./arch/i386/Kconfig	2004-10-18 11:52:51.529009552 -0600
@@ -724,6 +724,25 @@
 	depends on HIGHMEM64G
 	default y
 
+choice
+	prompt "User address space size"
+
+config USER_3GB
+        depends on X86
+	bool "3GB User Address Space"
+	default y if (X86)
+
+config USER_2GB
+        depends on X86
+	bool "2GB User Address Space"
+
+config USER_1GB
+        depends on X86
+	bool "1GB User Address Space"
+
+endchoice
+
+
 # Common NUMA Features
 config NUMA
 	bool "Numa Memory Allocation and Scheduler Support"
diff -Naur ./include/asm-generic/page_offset.h ../linux-2.6.9-mdb/./include/asm-generic/page_offset.h
--- ./include/asm-generic/page_offset.h	1969-12-31 17:00:00.000000000 -0700
+++ ../linux-2.6.9-mdb/./include/asm-generic/page_offset.h	2004-10-18 11:52:51.530009400 -0600
@@ -0,0 +1,24 @@
+
+#include <linux/config.h>
+
+#ifdef __ASSEMBLY__
+
+#if defined(CONFIG_USER_1GB)
+#define PAGE_OFFSET_RAW 0x40000000
+#elif defined(CONFIG_USER_2GB)
+#define PAGE_OFFSET_RAW 0x80000000
+#elif defined(CONFIG_USER_3GB)
+#define PAGE_OFFSET_RAW 0xC0000000
+#endif
+
+#else
+
+#if defined(CONFIG_USER_1GB)
+#define PAGE_OFFSET_RAW 0x40000000UL
+#elif defined(CONFIG_USER_2GB)
+#define PAGE_OFFSET_RAW 0x80000000UL
+#elif defined(CONFIG_USER_3GB)
+#define PAGE_OFFSET_RAW 0xC0000000UL
+#endif
+
+#endif
diff -Naur ./include/asm-generic/vmlinux.lds.h ../linux-2.6.9-mdb/./include/asm-generic/vmlinux.lds.h
--- ./include/asm-generic/vmlinux.lds.h	2004-10-18 15:53:08.000000000 -0600
+++ ../linux-2.6.9-mdb/./include/asm-generic/vmlinux.lds.h	2004-10-18 11:52:51.545007120 -0600
@@ -1,3 +1,6 @@
+
+#include <asm-generic/page_offset.h>
+
 #ifndef LOAD_OFFSET
 #define LOAD_OFFSET 0
 #endif
diff -Naur ./include/asm-i386/page.h ../linux-2.6.9-mdb/./include/asm-i386/page.h
--- ./include/asm-i386/page.h	2004-10-18 15:53:22.000000000 -0600
+++ ../linux-2.6.9-mdb/./include/asm-i386/page.h	2004-10-18 11:52:51.545007120 -0600
@@ -121,9 +121,11 @@
 #endif /* __ASSEMBLY__ */
 
 #ifdef __ASSEMBLY__
-#define __PAGE_OFFSET		(0xC0000000)
+#include <asm-generic/page_offset.h>
+#define __PAGE_OFFSET		(PAGE_OFFSET_RAW)
 #else
-#define __PAGE_OFFSET		(0xC0000000UL)
+#include <asm-generic/page_offset.h>
+#define __PAGE_OFFSET		(PAGE_OFFSET_RAW)
 #endif
 
 
diff -Naur ./mm/memory.c ../linux-2.6.9-mdb/./mm/memory.c
--- ./mm/memory.c	2004-10-18 11:46:59.000000000 -0600
+++ ../linux-2.6.9-mdb/./mm/memory.c	2004-10-18 11:52:51.547006816 -0600
@@ -119,8 +119,7 @@
 
 static inline void free_one_pgd(struct mmu_gather *tlb, pgd_t * dir)
 {
-	int j;
-	pmd_t * pmd;
+	pmd_t *pmd, *md, *emd;
 
 	if (pgd_none(*dir))
 		return;
@@ -131,8 +130,8 @@
 	}
 	pmd = pmd_offset(dir, 0);
 	pgd_clear(dir);
-	for (j = 0; j < PTRS_PER_PMD ; j++)
-		free_one_pmd(tlb, pmd+j);
+	for (md = pmd, emd = pmd + PTRS_PER_PMD; md < emd; md++) 
+	   free_one_pmd(tlb, md);
 	pmd_free_tlb(tlb, pmd);
 }