linux-kernel - Re: [RFC][PATCH] nmi watchdog: handle NMI_IO_APIC on nmi

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Message-ID: <20080321114752.GA25225@elte.hu>
Date:	Fri, 21 Mar 2008 12:47:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Aristeu Rozanski <aris@...vo.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] nmi watchdog: handle NMI_IO_APIC on nmi_watchdog


* Aristeu Rozanski <aris@...vo.org> wrote:

> This patch includes code to handle NMI_IO_APIC enabling/disabling by
> nmi_watchdog proc file.

hm:

> +static void disable_ioapic_nmi_watchdog(void)
> +{
> +	on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
> +}

stop_apic_nmi_watchdog() doesnt currently properly disable the 
generation of NMIs when they come from an IO-APIC, so this will need 
more fixes i believe. One approach would be to save the IO-APIC id and 
pin when the watchdog is set up, and use it later on to poke that 
IO-APIC register to disable NMI generation there.

	Ingo
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