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

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Message-ID: <45379031.601@yahoo.com.au>
Date:	Fri, 20 Oct 2006 00:48:17 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andi Kleen <ak@...e.de>
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

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.

-- 
SUSE Labs, Novell Inc.
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