linux-kernel - Re: [RFC][PATCH] lockdep: WARN about local_irq

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Message-Id: <20100406.042235.133749467.davem@davemloft.net>
Date:	Tue, 06 Apr 2010 04:22:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	peterz@...radead.org
Cc:	fweisbec@...il.com, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, acme@...hat.com,
	paulus@...ba.org
Subject: Re: [RFC][PATCH] lockdep: WARN about local_irq_{en,dis}able in NMI
 context

From: Peter Zijlstra <peterz@...radead.org>
Date: Tue, 06 Apr 2010 13:20:19 +0200

> On Tue, 2010-04-06 at 04:13 -0700, David Miller wrote:
>> From: Peter Zijlstra <peterz@...radead.org>
>> Date: Tue, 06 Apr 2010 13:12:01 +0200
>> 
>> > One thing we can do is make the code WARN about this, how about
>> > something like the below
>> 
>> It's going to warn every bootup in cpu_clock() on x86.
> 
> *sigh*, yes, we could hack around that I suppose.. it would be nice to
> automate this check though, I bet you don't fancy tracking down more
> such splats than you have to.
> 
> You could of course insert the debug code into your arch routines but
> that would limit the coverage checks to whatever you happen to run.

Yes, f.e. you could add local_irq_*_nmi() or similar that don't
complain when called inside of an NMI.

I would certainly welcome this debugging facility, for sure!

It would have saved me two days of work this time, in fact.


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