[S390] lockdep: show held locks when showing a stackdump

Follow i386/x86_64:
lockdep can be used to print held locks when printing a
backtrace. This can be useful when debugging things like
'scheduling while atomic' asserts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 475dbb8844301ca0824b2df5826effb00985e5f0..3cbb0dcf1f1dc845d744077c95c416796e85ddb0 100644 (file)
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -129,7 +129,7 @@ __show_trace(unsigned long sp, unsigned long low, unsigned long high)
        }
 }
 
-void show_trace(struct task_struct *task, unsigned long * stack)
+void show_trace(struct task_struct *task, unsigned long *stack)
 {
        register unsigned long __r15 asm ("15");
        unsigned long sp;
@@ -151,6 +151,9 @@ void show_trace(struct task_struct *task, unsigned long * stack)
                __show_trace(sp, S390_lowcore.thread_info,
                             S390_lowcore.thread_info + THREAD_SIZE);
        printk("\n");
+       if (!task)
+               task = current;
+       debug_show_held_locks(task);
 }
 
 void show_stack(struct task_struct *task, unsigned long *sp)