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SubjectRe: [PATCH] Export touch_nmi_watchdog
On Tue, Aug 05, 2003 at 09:15:54PM +0000, Arjan van de Ven wrote:
> On Tue, Aug 05, 2003 at 11:14:16PM +0200, Andi Kleen wrote:
> > > Otherwise this will just keep on expanding.
> >
> > It does expand on i386 exactly because the watchdog is disabled by default.
> >
> > Looks like a mistake to me. It should be on because having usable backtraces
> > on a deadlock/hang is useful enough that it outweights any other possible
> > disadvantages. That's especially true for kernels out there at user's boxes,
> > not just special debugging kernels run by developers.
> >
> > [if there should be any hardware where it doesn't work it should be blacklisted
> > there]
>
> the reason it's off is that certain IBM bioses corrupt the eax register on
> NMI's when they collide with smm stuff... You'd be surprised how
> tolerant x86 is against such corruptions... but not 100% :)

That could be catched by a dmi_scan.c entry ?

-Andi

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