linux-kernel - Re: [PATCH 5/6] x86: move mtrr cpu cap setting early in early_init

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Message-ID: <20080904191333.GD24990@elte.hu>
Date:	Thu, 4 Sep 2008 21:13:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org, Krzysztof Helt <krzysztof.h1@...pl>
Subject: Re: [PATCH 5/6] x86: move mtrr cpu cap setting early in
	early_init_xxxx


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> Krzysztof Helt <krzysztof.h1@...pl> found mtrr is not detected on k6-2
> 
> root case:
> 	we move mtrr_bp_init early for mtrr trimming.
> and in early_detect, only read cap from cpuid, so some cpu doesn't have
> that bit in cpuid and need to set workaround bit will have problem.
> 
> need to add early_init_xxxx to preset those bit before mtrr_bp_init
> for those earlier cpus.
> 
> this patch is for 2.6.27

hm, not sure we can do it in v2.6.27 as it depends on the other CPU init 
patches and that is a rather sensitive codepath. This problem should be 
present in v2.6.26 too, right?

	Ingo
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