linux-kernel - Re: [PATCH 2/2] x86: re-enable MCE on secondary CPUS after suspend/resume

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Date:	Tue, 16 Dec 2008 23:03:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: re-enable MCE on secondary CPUS after
	suspend/resume


* Andreas Herrmann <andreas.herrmann3@....com> wrote:

> On Mon, Dec 15, 2008 at 11:33:10PM +0100, Andi Kleen wrote:
> > > void __cpuinit mcheck_init(struct cpuinfo_x86 *c)
> > > {
> > >         static cpumask_t mce_cpus = CPU_MASK_NONE;
> > > 
> > >         mce_cpu_quirks(c);
> > > 
> > >         if (mce_dont_init ||
> > >             cpu_test_and_set(smp_processor_id(), mce_cpus) ||
> > >             !mce_available(c))
> > >   =>             return;
> > > 
> > >         mce_init(NULL);
> > >         mce_cpu_features(c);
> > > }
> > > 
> > > But we need to call mce_init to clear all MCE state.
> > > IMHO the best location to call mce_init for APs is the cpu notifier.
> > 
> > Ah got it. Thanks that makes sense. 
> > 
> > But I think the better fix is to just drop the mce_cpus check and
> > then handly it naturally in the standard bootup path. I'm not
> > sure what it was good for anyways. I copied it into the 64bit code
> > from 32bit, but I suppose even there it isn't really needed and on 
> > 32bit it is already gone even.
> > 
> > How about this patch. Does it fix the problem for you too?
> 
> Yup, works as well:
> 
> Tested-by: Andreas Herrmann <andreas.herrmann3@....com>

applied to tip/x86/urgent, thanks guys.

	Ingo
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