[S390] Add four level page tables for CONFIG_64BIT=y.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index e878563..5a21f45 100644
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -64,24 +64,28 @@
*/
#ifndef __s390x__
-# define TASK_SIZE (0x80000000UL)
-# define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
-# define DEFAULT_TASK_SIZE (0x80000000UL)
+#define TASK_SIZE (1UL << 31)
+#define TASK_UNMAPPED_BASE (1UL << 30)
#else /* __s390x__ */
-# define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
- (0x80000000UL) : (0x40000000000UL))
-# define TASK_SIZE TASK_SIZE_OF(current)
-# define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
-# define DEFAULT_TASK_SIZE (0x40000000000UL)
+#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk,TIF_31BIT) ? \
+ (1UL << 31) : (1UL << 53))
+#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
+ (1UL << 30) : (1UL << 41))
+#define TASK_SIZE TASK_SIZE_OF(current)
#endif /* __s390x__ */
#ifdef __KERNEL__
-#define STACK_TOP TASK_SIZE
-#define STACK_TOP_MAX DEFAULT_TASK_SIZE
+#ifndef __s390x__
+#define STACK_TOP (1UL << 31)
+#else /* __s390x__ */
+#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:53))
+#endif /* __s390x__ */
+
+#define STACK_TOP_MAX STACK_TOP
#endif