linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Message-Id: <20100409104345.80DA.A69D9226@jp.fujitsu.com>
Date:	Fri,  9 Apr 2010 10:45:17 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com, Borislav Petkov <bp@...en8.de>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com, hannes@...xchg.org
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas of a mergeable VMA

> 
> 
> On Fri, 9 Apr 2010, Borislav Petkov wrote:
> > 
> > Yep, looks good: its mmap_region()...
> 
> Can you double-check your current diffs - maybe something got corrupted.
> 
> mmap_region installs the vma with vma_link(), and the last thing 
> vma_link() does with my patch is that "anon_vma_prepare()".

I agree. and at least your patch works fine on my box. I'll continue digg.



> 
> Maybe with all the patches flying around, you had a reject or something, 
> and you lost that one anon_vma_prepare()?
> 
> Or maybe I screwed up somewhere and sent you the wrong patch. Here it is 
> again, just in case.
> 
> [ I have a horrible cold, and can hardly think straight. So who knows, 
>   maybe I'm missing something. But if you have lost one of the 
>   'anon_vma_prepare()' call sites, that would certainly explain why you 
>   get NULL anon_vma's ]
> 
> 		Linus


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