simplify the stacktrace code

Simplify the stacktrace code:

 - remove the unused task argument to save_stack_trace, it's always
   current
 - remove the all_contexts flag, it's alwasy 0

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andi Kleen <ak@suse.de>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 11 deletions

diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index 2e5c65a1863e..515ff9011dd7 100644
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -59,7 +59,7 @@ static unsigned long save_context_stack(struct stack_trace *trace,
         }
 }
 
-void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
+void save_stack_trace(struct stack_trace *trace)
 {
         register unsigned long sp asm ("15");
         unsigned long orig_sp, new_sp;
@@ -69,20 +69,16 @@ void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
         new_sp = save_context_stack(trace, &trace->skip, orig_sp,
                                 S390_lowcore.panic_stack - PAGE_SIZE,
                                 S390_lowcore.panic_stack);
-        if ((new_sp != orig_sp) && !trace->all_contexts)
+        if (new_sp != orig_sp)
                 return;
         new_sp = save_context_stack(trace, &trace->skip, new_sp,
                                 S390_lowcore.async_stack - ASYNC_SIZE,
                                 S390_lowcore.async_stack);
-        if ((new_sp != orig_sp) && !trace->all_contexts)
+        if (new_sp != orig_sp)
                 return;
-        if (task)
-                save_context_stack(trace, &trace->skip, new_sp,
-                                   (unsigned long) task_stack_page(task),
-                                   (unsigned long) task_stack_page(task) + THREAD_SIZE);
-        else
-                save_context_stack(trace, &trace->skip, new_sp,
-                                   S390_lowcore.thread_info,
-                                   S390_lowcore.thread_info + THREAD_SIZE);
+
+        save_context_stack(trace, &trace->skip, new_sp,
+                           S390_lowcore.thread_info,
+                           S390_lowcore.thread_info + THREAD_SIZE);
         return;
 }