linux-kernel - Re: [PATCH] tracing: Fix lockdep warning in global

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Message-ID: <4B316B66.2020206@cn.fujitsu.com>
Date:	Wed, 23 Dec 2009 08:59:18 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	rostedt@...dmis.org, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: Fix lockdep warning in global_clock()

Peter Zijlstra wrote:
> On Tue, 2009-12-22 at 13:17 +0800, Li Zefan wrote:
> 
>> Looking into sched_clock.c, seems the only place that can trigger lockdep
>> is the local_irq_* in cpu_clock(), though I'm not sure for architecture-
>> specific sched_clock().
> 
> But why would you want to do that? that reduces the lockdep coverage for
> no good reason, just fix up the tracer.
> 

Then the proper fix is to use local_irq_* in global_clock(), which
is what this patch does.

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