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

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Date:	Thu, 16 Nov 2006 15:01:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] lockdep: show held locks when showing a stackdump


* Ingo Molnar <mingo@...e.hu> wrote:

> Subject: [patch] lockdep: show held locks when showing a stackdump
> From: Ingo Molnar <mingo@...e.hu>
> 
> lockdep can be used to print held locks when printing a backtrace. 
> This can be useful when debugging things like 'scheduling while 
> atomic' asserts.

on x86_64 this also needs the patch below - NULL means 'current'.

	Ingo

Index: linux/kernel/lockdep.c
===================================================================
--- linux.orig/kernel/lockdep.c
+++ linux/kernel/lockdep.c
@@ -395,7 +395,11 @@ static void print_lock(struct held_lock 
 
 static void lockdep_print_held_locks(struct task_struct *curr)
 {
-	int i, depth = curr->lockdep_depth;
+	int i, depth;
+
+	if (!curr)
+		curr = current;
+	depth = curr->lockdep_depth;
 
 	if (!depth) {
 		printk("no locks held by %s/%d.\n", curr->comm, curr->pid);
-
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