linux-kernel - Re: [patch 12/13] GRU Driver V3 - export is_uv_system(), zap_page_range() & follow

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Date:	Mon, 07 Jul 2008 09:45:25 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Christoph Hellwig <hch@...radead.org>
CC:	steiner@....com, akpm@...uxfoundation.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	holt@....com, andrea@...ranet.com
Subject: Re: [patch 12/13] GRU Driver V3 -  export is_uv_system(),	zap_page_range()
 & follow_page()

Christoph Hellwig wrote:
> On Thu, Jul 03, 2008 at 04:34:00PM -0500, steiner@....com wrote:
>> +EXPORT_SYMBOL_GPL(zap_page_range);
>>  
>>  /*
>>   * Do a quick page-table lookup for a single page.
>> @@ -1089,6 +1090,7 @@ no_page_table:
>>  	}
>>  	return page;
>>  }
>> +EXPORT_SYMBOL_GPL(follow_page);
> 
> NACK.
> 
> These should never be called by a driver and suggest you need to rething
> your VM integration in this driver.

Well here we cannot run get_user_pages() since the context is atomic. What other choice is there?

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