[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <200710012116.59356.ak@suse.de>
Date: Mon, 1 Oct 2007 21:16:59 +0200
From: Andi Kleen <ak@...e.de>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: David Bahi <dbahi@...ell.com>, linux-kernel@...r.kernel.org,
linux-rt-users@...r.kernel.org,
Gregory Haskins <GHaskins@...ell.com>
Subject: Re: nmi_watchdog fix for x86_64 to be more like i386
On Monday 01 October 2007 20:54:21 Thomas Gleixner wrote:
> On Mon, 1 Oct 2007, Andi Kleen wrote:
>
> > On Wednesday 26 September 2007 20:03:12 David Bahi wrote:
> > > Thanks to tglx and ghaskins for all the help in tracking down a very
> > > early nmi_watchdog crash on certain x86_64 machines.
> >
> > The patch is totally bogus. irq 0 doesn't say anything about whether
> > the current CPU still works or not. You always need some local
> > interrupt. This basically disables the NMI watchdog for the non boot CPUs.
> >
> > It's even wrong on i386 -- i wonder how that broken patch
> > made it in there. I'll remove it there.
>
> Right, it's wrong for the broadcast case, but simply removing it will
> trigger false positives on the CPU which runs the broadcast timer. I
> fix this proper.
I already did this here by checking for cpu != 0. But it also needs either tracking
or forbidding migrations of irq 0. I can take care of the patch.
-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists