linux-kernel - Re: mtrr cleanup not doing anything on 2.6.33-rc7

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Message-ID: <4B741ABB.2000600@zytor.com>
Date:	Thu, 11 Feb 2010 06:56:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Carlos R. Mafra" <crmafra2@...il.com>
CC:	Alexander Lam <lambchop468@...il.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: Re: mtrr cleanup not doing anything on 2.6.33-rc7

On 02/11/2010 02:10 AM, Carlos R. Mafra wrote:
> [Add people in that commit to Cc: list, just in case]
> 
> On Mi 10.Feb'10 at 20:48:49 -0500, Alexander Lam wrote:
>> On Wed, Feb 10, 2010 at 3:02 PM, Alexander Lam <lambchop468@...il.com> wrote:
>>>
>>> My kernel config has the following:
>>> CONFIG_MTRR=y
>>> CONFIG_MTRR_SANITIZER=y
>>> CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
>>> CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
>>>
>>> With previous kernels, dmesg would show that the sanitizer was indeed
>>> cleaning up the mtrrs [1]
>>>
>>> but now, with 2.6.33-rc7 there is no indication that this is occuring,
>>
>> For those who run across this later,
>>
>> Found out that commit 508d85c2c6bc8cba53d2a54d9a306ad64a0a80bf,
>>    x86: When cleaning MTRRs, do not fold WP into UC
>>
>> causes mtrr cleanup not to run on my machine.
>>
>> Probably not worth fixing because the i915 error message is harmless.
>> --

You're not stating what your MTRR setup looks like, and hence if there
is anything to clean up.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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