linux-kernel - Re: [patch 3/3] mm: fault handler to replace nopage and populate

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Date:	Tue, 10 Oct 2006 10:39:48 +0200
From:	Thomas Hellstrom <thomas@...gstengraphics.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Linux Memory Management <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch 3/3] mm: fault handler to replace nopage and populate

Benjamin Herrenschmidt wrote:
>>Still, even with NOPAGE_REFAULT or the equivalent with the new fault() code,
>>in the case we need to take this route, (and it looks like we won't have 
>>to),
>>I guess we still need to restart from find_vma() in the fault()/nopage() 
>>handler to make sure the VMA is still present. The object mutex need to 
>>be dropped as well to avoid deadlocks. Sounds complicated.
> 
> 
> But as we said, it should be enough to do the flag change with the
> object mutex held as long as it's after unmap_mapped_ranges()
> 
> Ben.
> 
> 
Agreed.
/Thomas



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