linux-kernel - Re: [PATCH V2 -tip 3/4] Tracing/ftrace: Adapt mmiotrace to the new type of print

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Date:	Tue, 30 Sep 2008 17:39:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Pekka Paalanen <pq@....fi>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 -tip 3/4] Tracing/ftrace: Adapt mmiotrace to the new
	type of print_line


* Frédéric Weisbecker <fweisbec@...il.com> wrote:

> 2008/9/30 Steven Rostedt <rostedt@...dmis.org>:
> >
> > OK, I'll nuke the ring_buffer_lock :-/
> >
> > The trace_pipe calls that and then calls print_trace_line which will
> > eventually lock the buffer again. This is a bug on my part. I'll fix that
> > today.
> >
> > Thanks,
> 
> Strange, I can't see any case where print_trace_line could call the
> ring_buffer_lock.
> Hmm, I will see in your patch.
> 
> Ingo, I just saw one damage from the merging, trace_empty() returns 
> TRACE_TYPE_HANDLED. The type is wrong, it should return 1. It's not 
> urgent since the value is the same. Should I send a patch for such a 
> small error?

yes, please do. One too many patch is far better than one too few ;-)

	Ingo
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