linux-kernel - Re: [GIT PULL] tracing: use raw spinlocks for trace

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Message-ID: <20090311182656.GA23739@elte.hu>
Date:	Wed, 11 Mar 2009 19:26:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] tracing: use raw spinlocks for trace_vprintk


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, 2009-03-10 at 21:26 -0400, Steven Rostedt wrote:
> 
> > commit 80370cb758e7ca2692cd9fb5e413d970b1f4b2b2
> > Author: Steven Rostedt <srostedt@...hat.com>
> > Date:   Tue Mar 10 17:16:35 2009 -0400
> > 
> >     tracing: use raw spinlocks for trace_vprintk
> >     
> >     Impact: prevent locking up by lockdep tracer
> >     
> >     The lockdep tracer uses trace_vprintk and thus trace_vprintk can not
> >     call back into lockdep without locking up.
> 
> Hmm, I did this when I posted the lockdep tracepoints, so someone then
> did a bad copy/paste job when renaming ftrace_printk or something?
> 
> See efed792d6738964f399a508ef9e831cd60fa4657

What's the conclusion in this thread? I'm holding the pull 
until there's agreement.

	Ingo
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