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Date: Fri, 25 Oct 2013 12:57:42 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Fenghua Yu <fenghua.yu@intel.com>
Cc: H Peter Anvin <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86/apic: Disable I/O APIC before shutdown local APIC
Message-ID: <20131025105742.GA5485@gmail.com>
References: <1382578212-4677-1-git-send-email-fenghua.yu@intel.com>
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* Fenghua Yu <fenghua.yu@intel.com> wrote:

> From: Fenghua Yu <fenghua.yu@intel.com>
> 
> In reboot and crash path, when shutdown local APIC, I/O APIC is still active.
> This may cause issues because external interrupts can still come in and
> disturb local APIC during shutdown process. To quiet external interrupts,
> disable I/O APIC before shutdown local APIC.

What specific 'issues' were observed, on what kind of systems?

Thanks,

	Ingo