linux-kernel - Re: [patch 1/2] x2apic: fix reserved APIC register accesses in print_local

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Message-ID: <20080905160414.GL10292@elte.hu>
Date:	Fri, 5 Sep 2008 18:04:14 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [patch 1/2] x2apic: fix reserved APIC register accesses in
	print_local_APIC()


* Maciej W. Rozycki <macro@...ux-mips.org> wrote:

> On Wed, 3 Sep 2008, Suresh Siddha wrote:
> 
> > from SDV Vol 3a Section 17.27.1
> > 
> >   The remote read delivery mode provided in the 82489DX and local APIC for
> >   Pentium processors is not supported in the local APIC in the Pentium 4, Intel
> >   Xeon, and P6 family processors.
> > 
> > It looks like it is not supported (officially atleast) even in APIC bus
> > architectures. Only the Pentium integrated APIC seems to be the exception.
> 
>  Yeah, trust documentation and see where you'll get... ;)

hm, is the remote read debug output, now that it's not present in CPUs 
made in the past 5 years or so, really that important?

	Ingo
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