linux-kernel - Re: 2.6.{26.2,27-rc} oops on virtualbox

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Message-ID: <20080826150222.0cf1542c@doriath.conectiva>
Date:	Tue, 26 Aug 2008 15:02:22 -0300
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Gerhard Brauer <gerhard.brauer@....de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.{26.2,27-rc} oops on virtualbox

Em Tue, 26 Aug 2008 13:18:22 -0400
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> escreveu:

| * Luiz Fernando N. Capitulino (lcapitulino@...driva.com.br) wrote:
| > Em Tue, 26 Aug 2008 10:53:38 -0400
| > Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> escreveu:
| > 
| > | Then, after having tested (2), try this on top of it :
| > | 
| > | In arch/x86/kernel/alternative.c, alternatives_smp_switch()
| > | 
| > | Add   unsigned long flags;
| > | Change 
| > | spin_lock -> spin_lock_irqsave(&smp_alt, flags);
| > | spin_unlock(&smp_alt); -> spin_unlock_irqrestore(&smp_alt, flags);
| > 
| >  Hmm, I can't find spin_lock functions in alternatives_smp_switch()
| > looks like the current implementation is now using mutexes.
| > 
| 
| Sorry, I was looking directly at the commit which caused the problem.
| Yes, these modif should go on top of the text_poke -> text_poke_early.
| 
| So in current mainline, change, in alternatives_smp_switch() :
| 
| mutex_lock(&smp_alt);
| ...
| 
| mutex_unlock(&smp_alt);
| 
| to
| 
| mutex_lock(&smp_alt);
| local_irq_save(flags);
| ...
| 
| local_irq_restore(flags);
| mutex_unlock(&smp_alt);

 Did not help, same oops here.

-- 
Luiz Fernando N. Capitulino
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