linux-kernel - Re: [PATCH] Option to disable AMD C1E (allows dynticks to work)

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Message-ID: <20071214181233.GB16351@one.firstfloor.org>
Date:	Fri, 14 Dec 2007 19:12:33 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Eduard-Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] Option to disable AMD C1E (allows dynticks to work)

> magically in the SMM code. To work around this is we would need to add
> the broadcast notification to the halt(), safe_halt(), pm_idle_halt()
> variants which float around in the kernel and make this conditional on
> the C1E detection. That's nasty, but it seems the only solution for
> now.

On 64bit it would be easy using the idle notifiers. Perhaps they need
to be extended to pass in the sleep state though.
 
-Andi
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