linux-kernel - Re: [patch] disable NMI watchdog by default

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Message-Id: <200703071556.49547.ak@suse.de>
Date:	Wed, 7 Mar 2007 15:56:49 +0100
From:	Andi Kleen <ak@...e.de>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Adrian Bunk <bunk@...sta.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [patch] disable NMI watchdog by default

On Wednesday 07 March 2007 04:06, Roland Dreier wrote:
>  > --- linux.orig/include/asm-x86_64/nmi.h
>  > +++ linux/include/asm-x86_64/nmi.h
>  > @@ -63,7 +63,7 @@ extern int setup_nmi_watchdog(char *);
>  >  
>  >  extern atomic_t nmi_active;
>  >  extern unsigned int nmi_watchdog;
>  > -#define NMI_DEFAULT	-1
>  > +#define NMI_DEFAULT	0
> 
> Maybe I'm missing something obvious, but this patch doesn't seem
> correct to me.  The sentiment of disabling the NMI watchdog by default
> is fine, and I agree with it, but I don't think this patch does what
> it says.  First of all, I have a system running a kernel with this
> patch applied (v2.6.21-rc2-gc3442e2), and I see NMIs in
> /proc/interrupts and "testing NMI watchdog ... OK." in the log.

Yes the patch looks quite broken.

-Andi
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