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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 43 of 66] don't leave orhpaned swap cache after ksm merging
Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
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> From: Andrea Arcangeli <aarcange@redhat.com>
> 
> When swapcache is replaced by a ksm page don't leave orhpaned swap cache.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> Reviewed-by: Rik van Riel <riel@redhat.com>

This explanation seems to tell this is bugfix. If so, please separate
this one from THP and will send mainline and -stable soon.