linux-kernel - Re: [PATCH v3] mm/rmap: fix BUG at rmap

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Message-ID: <20131219060703.GA27787@lge.com>
Date:	Thu, 19 Dec 2013 15:07:03 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm/rmap: fix BUG at rmap_walk

On Thu, Dec 19, 2013 at 02:55:10PM +0900, Joonsoo Kim wrote:
> On Thu, Dec 19, 2013 at 01:41:55PM +0800, Wanpeng Li wrote:
> > This bug is introduced by commit 37f093cdf(mm/rmap: use rmap_walk() in 
> > page_referenced()). page_get_anon_vma() called in page_referenced_anon() 
> > will lock and increase the refcount of anon_vma. PageLocked is not required 
> > by page_referenced_anon() and there is not any assertion before, commit 
> > 37f093cdf introduced this extra BUG_ON() checking for anon page by mistake.
> > This patch fix it by remove rmap_walk()'s VM_BUG_ON() and comment reason why 
> > the page must be locked for rmap_walk_ksm() and rmap_walk_file().

FYI.

See following link to get more information.

https://lkml.org/lkml/2004/7/12/241

Thanks.
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