linux-kernel - Re: [PATCH] Make LIST

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Message-ID: <4832BE47.2070209@firstfloor.org>
Date:	Tue, 20 May 2008 14:04:23 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Avi Kivity <avi@...ranet.com>
CC:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make LIST_POISON less deadly

Avi Kivity wrote:
> Andi Kleen wrote:
>>> Makes sense.  I'll send out v3.
>>>
>>> Is there a similar range on i386?
>>>     
>>
>> Don't think so. Address space is too precious here.
>>
>> What you could probably do is to unmap one fixed page in some range
>> that is always split to 4K pages anyways and use that. Perhaps somewhere
>> in the 640k-1MB range. But if you're unlucky this might require a
>> variable, not a constant.
>>   
> 
> I guess a fixmap would work for this.  But then the offsets added to
> that page would need to be limited to 4K.

You could make a 3 page fixmap and point to the middle page. 3 because
negative offsets are also especially importants for list_heads due to
list_entry

-Andi


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