linux-kernel - Re: [PATCH 01/13] jump label v9: notifier atomic call chain notrace

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Message-ID: <20100609215810.GA12752@nowhere>
Date:	Wed, 9 Jun 2010 23:58:13 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	mathieu.desnoyers@...ymtl.ca, hpa@...or.com, tglx@...utronix.de,
	rostedt@...dmis.org, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, mhiramat@...hat.com, avi@...hat.com,
	davem@...emloft.net, vgoyal@...hat.com, sam@...nborg.org
Subject: Re: [PATCH 01/13] jump label v9: notifier atomic call chain notrace

On Wed, Jun 09, 2010 at 05:38:52PM -0400, Jason Baron wrote:
> From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> 
> In LTTng, being able to use the atomic notifier from cpu idle entry to
> ensure the tracer flush the last events in the current subbuffer
> requires the rcu read-side to be marked "notrace", otherwise it can end
> up calling back into lockdep and the tracer.
> 
> Also apply to the the die notifier.
> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> Signed-off-by: Jason Baron <jbaron@...hat.com>
> Reviewed-by: Masami Hiramatsu <mhiramat@...hat.com>
> ---



I don't understand the purpose of this patch. The only notifier
I see that is used by jmp label is the module notifier, and I
don't see how it can do bad things if we don't use the notrace
version.

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