linux-kernel - Re: [PATCH -tip] x86: cpu_debug.c prepare report if files are inappropriate or CPU is not supported

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Message-ID: <20090414200247.1d0a8667@lxorguk.ukuu.org.uk>
Date:	Tue, 14 Apr 2009 20:02:47 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: cpu_debug.c prepare report if files are
 inappropriate or CPU is not supported

> > Do you still think that boot_cpu_data.x86_vendor is better option in
> > case for multiple CPUs.
> 
> yes. Assymetric SMP never really happened on x86.

It did but not between vendors. You can get away with a vendor assumption
but cpu type (mixed 486SX/DX, PII/PIII/Celeron) mixed steppings and mixed
speeds do occur. We've never supported the mixed 486SX cases but the
PII/PIII cases work (or at least worked).

Alan
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