linux-kernel - Re: MTRR setup failure on Fujitsu Lifebook S761

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Date:	Fri, 26 Aug 2011 15:24:26 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	Tony Vroon <tony@...x.net>, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	yinghai@...nel.org
Subject: Re: MTRR setup failure on Fujitsu Lifebook S761

On 08/26/2011 02:29 PM, Suresh Siddha wrote:
> On Fri, 2011-08-26 at 12:01 -0700, Tony Vroon wrote:
>> On Fri, 2011-08-26 at 09:37 -0700, H. Peter Anvin wrote:
>>> Hm, I don't see any evidence of the MTRR sanitizer running at all...
>>
>> It is almost as if it failed to find an optimal configuration; does that
>> error path not print anything?
> 
> MTRR cleanup bails out in mtrr_need_cleanup() if it finds any entry
> other than WB or UC. And the first entry you had was write-protect.

WP for the BIOS is becoming reasonably common; we need to handle that.

	-hpa

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