linux-kernel - Re: [PATCH v2 0/5] Add movablecore

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Message-ID: <50B598E7.6090506@huawei.com>
Date:	Wed, 28 Nov 2012 12:53:59 +0800
From:	Jianguo Wu <wujianguo@...wei.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	wujianguo <wujianguo106@...il.com>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <rob@...dley.net>,
	<isimatu.yasuaki@...fujitsu.com>, <laijs@...fujitsu.com>,
	<wency@...fujitsu.com>, <linfeng@...fujitsu.com>,
	<jiang.liu@...wei.com>, <yinghai@...nel.org>,
	<kosaki.motohiro@...fujitsu.com>, <minchan.kim@...il.com>,
	<mgorman@...e.de>, <rientjes@...gle.com>, <rusty@...tcorp.com.au>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 0/5] Add movablecore_map boot option

On 2012/11/28 11:47, Tang Chen wrote:

> On 11/27/2012 11:10 AM, wujianguo wrote:
>>
>> Hi Tang,
>>     DMA address can't be set as movable, if some one boot kernel with
>> movablecore_map=4G@...00000 or other memory region that contains DMA address,
>> system maybe boot failed. Should this case be handled or mentioned
>> in the change log and kernel-parameters.txt?
> 
> Hi Wu,
> 
> I think we can use MAX_DMA_PFN and MAX_DMA32_PFN to prevent setting DMA
> address as movable. Just ignore the address lower than them, and set
> the rest as movable. How do you think ?
> 

I think it's OK for now.

> And, since we cannot figure out the minimum of memory kernel needs, I
> think for now, we can just add some warning into kernel-parameters.txt.
> 
> Thanks. :)
> 
>>
>> Thanks,
>> Jianguo Wu
>>
> 
> .
> 



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