1 files changed, 19 insertions, 0 deletions

diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index 1f4765d6546f..fd98ca998b4f 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -113,6 +113,25 @@ extern struct task_struct *last_task_used_spe;
                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 #endif
 
+#ifdef __KERNEL__
+#ifdef __powerpc64__
+
+#define STACK_TOP_USER64 TASK_SIZE_USER64
+#define STACK_TOP_USER32 TASK_SIZE_USER32
+
+#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
+                   STACK_TOP_USER32 : STACK_TOP_USER64)
+
+#define STACK_TOP_MAX STACK_TOP_USER64
+
+#else /* __powerpc64__ */
+
+#define STACK_TOP TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
+
+#endif /* __powerpc64__ */
+#endif /* __KERNEL__ */
+
 typedef struct {
         unsigned long seg;
 } mm_segment_t;