linux-kernel - Re: [patch 1/3] kernel: local_irq_{save,restore}

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Date:	Tue, 06 Apr 2010 21:13:10 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...e.hu, David Miller <davem@...emloft.net>, acme@...hat.com,
	paulus@...ba.org, Mike Galbraith <efault@....de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [patch 1/3] kernel: local_irq_{save,restore}_nmi()

On Tue, 2010-04-06 at 15:28 +0200, Peter Zijlstra wrote:

> Index: linux-2.6/kernel/trace/trace_irqsoff.c
> ===================================================================
> --- linux-2.6.orig/kernel/trace/trace_irqsoff.c
> +++ linux-2.6/kernel/trace/trace_irqsoff.c
> @@ -316,6 +316,14 @@ void trace_hardirqs_off(void)
>  }
>  EXPORT_SYMBOL(trace_hardirqs_off);
>  
> +void trace_hardirqs_off_no_nmi(void)
> +{
> +	WARN_ON_ONCE(in_nmi());

Should we do this for all archs? I can imagine a lot of warning reports
coming in the near future. And they will be passing it towards me.

-- Steve



> +	if (!preempt_trace() && irq_trace())
> +		start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
> +}
> +EXPORT_SYMBOL(trace_hardirqs_off_no_nmi);
> +
>  void trace_hardirqs_on_caller(unsigned long caller_addr)
>  {
>  	if (!preempt_trace() && irq_trace())
> 
> 
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