linux-kernel - Re: + i386-time-avoid-pit-smp-lockups.patch added to -mm tree

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Date:	Thu, 19 Oct 2006 16:50:25 +0200
From:	Andi Kleen <ak@...e.de>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Daniel Walker <dwalker@...sta.com>, linux-kernel@...r.kernel.org,
	johnstul@...ibm.com, mingo@...e.hu, tglx@...utronix.de
Subject: Re: + i386-time-avoid-pit-smp-lockups.patch added to -mm tree

On Thursday 19 October 2006 16:48, Nick Piggin wrote:
> Andi Kleen wrote:
> >>An SMP kernel can boot on UP hardware, in which case I think
> >>num_possible_cpus() will be 1, won't it?
> > 
> > 
> > 0 was a typo, i meant 1 for UP of course. 0 would be nonsensical.
> 
> Sure, I realised that. For a UP kernel, the test will compile away.
> 
> But Daniel seems to say there is dead code that could be compiled
> out for SMP kernels. I just don't think that is possible because the
> SMP kernel can boot a UP system where num_possible_cpus() is 1.

I thought he meant !CONFIG_SMP kernels.

-Andi
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