diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index f008960..55908fd 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -113,10 +113,10 @@
 #endif
 #define PTRS_PER_PTE	((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
 
-#if PGDIR_SIZE >= TASK_SIZE
+#if PGDIR_SIZE >= TASK_SIZE64
 #define USER_PTRS_PER_PGD       (1)
 #else
-#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
+#define USER_PTRS_PER_PGD	(TASK_SIZE64 / PGDIR_SIZE)
 #endif
 #define FIRST_USER_ADDRESS	0UL
 
diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 0d629bb..ead6928 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -50,13 +50,10 @@
  * so don't change it unless you know what you are doing.
  */
 #define TASK_SIZE	0x7fff8000UL
-#define STACK_TOP	((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE)
 
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's.
- */
-#define TASK_UNMAPPED_BASE	((TASK_SIZE / 3) & ~(PAGE_SIZE))
+#ifdef __KERNEL__
+#define STACK_TOP_MAX	TASK_SIZE
+#endif
 
 #define TASK_IS_32BIT_ADDR 1
 
@@ -71,28 +68,29 @@
  * 8192EB ...
  */
 #define TASK_SIZE32	0x7fff8000UL
-#define TASK_SIZE	0x10000000000UL
-#define STACK_TOP	\
-	(((test_thread_flag(TIF_32BIT_ADDR) ?				\
-	   TASK_SIZE32 : TASK_SIZE) & PAGE_MASK) - SPECIAL_PAGES_SIZE)
+#define TASK_SIZE64	0x10000000000UL
+#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
 
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's.
- */
-#define TASK_UNMAPPED_BASE						\
-	(test_thread_flag(TIF_32BIT_ADDR) ?				\
-		PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
+#ifdef __KERNEL__
+#define STACK_TOP_MAX	TASK_SIZE64
+#endif
+
+
 #define TASK_SIZE_OF(tsk)						\
-	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
+	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
 
 #define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
 
 #endif
 
-#ifdef __KERNEL__
-#define STACK_TOP_MAX	TASK_SIZE
-#endif
+#define STACK_TOP	((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE)
+
+/*
+ * This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
+
 
 #define NUM_FPU_REGS	32
 
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index c2d53c1..653a412 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -35,7 +35,9 @@
 
 #ifdef CONFIG_64BIT
 
-#define __UA_LIMIT	(- TASK_SIZE)
+extern u64 __ua_limit;
+
+#define __UA_LIMIT	__ua_limit
 
 #define __UA_ADDR	".dword"
 #define __UA_LA		"dla"
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index f7faa3f..71620e1 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -25,6 +25,8 @@
 #include <asm/system.h>
 #include <asm/watch.h>
 #include <asm/spram.h>
+#include <asm/uaccess.h>
+
 /*
  * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
  * the implementation of the "wait" feature differs between CPU families. This
@@ -987,6 +989,12 @@
 	}
 }
 
+#ifdef CONFIG_64BIT
+/* For use by uaccess.h */
+u64 __ua_limit;
+EXPORT_SYMBOL(__ua_limit);
+#endif
+
 const char *__cpu_name[NR_CPUS];
 const char *__elf_platform;
 
@@ -1064,6 +1072,11 @@
 		c->srsets = 1;
 
 	cpu_probe_vmbits(c);
+
+#ifdef CONFIG_64BIT
+	if (cpu == 0)
+		__ua_limit = ~((1ull << cpu_vmbits) - 1);
+#endif
 }
 
 __cpuinit void cpu_report(void)