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

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Message-ID: <20061204145539.GY32059@skybase>
Date:	Mon, 4 Dec 2006 15:55:39 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	linux-kernel@...r.kernel.org, heiko.carstens@...ibm.com
Subject: [S390] lockdep: show held locks when showing a stackdump

From: Heiko Carstens <heiko.carstens@...ibm.com>

[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@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---

 arch/s390/kernel/traps.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

diff -urpN linux-2.6/arch/s390/kernel/traps.c linux-2.6-patched/arch/s390/kernel/traps.c
--- linux-2.6/arch/s390/kernel/traps.c	2006-12-04 14:50:55.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/traps.c	2006-12-04 14:50:57.000000000 +0100
@@ -129,7 +129,7 @@ __show_trace(unsigned long sp, unsigned 
 	}
 }
 
-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
 		__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)
-
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