linux-kernel - Re: [PATCH] i386/bigsmp: eliminate false warnings regarding logical APIC ID mismatches

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Date:	Thu, 18 Aug 2011 14:58:16 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Tejun Heo" <tj@...nel.org>
Cc:	<mingo@...e.hu>, <stable@...nel.org>, <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>, <hpa@...or.com>
Subject: Re: [PATCH] i386/bigsmp: eliminate false warnings regarding
	 logical APIC ID mismatches

>>> On 18.08.11 at 15:04, Tejun Heo <tj@...nel.org> wrote:
> On Thu, Aug 18, 2011 at 01:54:44PM +0100, Jan Beulich wrote:
>> Fix this (for the time being, i.e. until x86_32_early_logical_apicid()
>> will get removed again, as Tehun says ought to be possible) by
>> overriding the previously stored values at the point where the APIC
>> driver gets overridden.
> 
> Hmmm... how about just removing the WARN_ON() in setup_local_APIC()?
> We already don't depend on the value so just overriding it isn't
> dangerous at all.

I was not able to prove for myself that all of the uses of
early_per_cpu(x86_cpu_to_logical_apicid, ...) are actually only
possible to be hit after setup_local_APIC(), so I can't really
propose a patch like this.

Jan

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