linux-kernel - Re: (spurious?) lockdep warning on Xen boot

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Date:	Tue, 17 Feb 2009 11:27:54 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: (spurious?) lockdep warning on Xen boot

Peter Zijlstra wrote:
> Right, so you are saying you started out with IRQs enabled, and the
> above local_irq_restore() would simply be the first irq-op to re-enable
> it and goes splat.
>   
Yep.

> In which case your disabled from beginning 'fix' looks like the right
> thing to do.
>   

OK.

>> Or perhaps the second warning is real; in which case, where does the 
>> problem lie? (I guess another case of being bitten by calling 
>> __purge_vmap_area_lazy from interrupt context.)
>>     
>
> Looks like a real problem, and yes your suggestion makes sense.
>   

OK.

Thanks,
    J
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