Re: [PATCH v3] mm/rmap: fix BUG at rmap_walk

[Joonsoo Kim]

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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