1 files changed, 3 insertions, 5 deletions

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index a46793beeddd..b7630436f693 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -150,13 +150,11 @@ void show_stack(struct task_struct *task, unsigned long *sp)
         unsigned long *stack;
         int i;
 
-        // debugging aid: "show_stack(NULL);" prints the
-        // back trace for this cpu.
-
         if (!sp)
-                sp = task ? (unsigned long *) task->thread.ksp : __r15;
+                stack = task ? (unsigned long *) task->thread.ksp : __r15;
+        else
+                stack = sp;
 
-        stack = sp;
         for (i = 0; i < kstack_depth_to_print; i++) {
                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
                         break;