linux-kernel - Re: [PATCH] mm: hugetlb: undo change to page mapcount in fault handler

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Message-Id: <20111226160041.df3b6f2c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 26 Dec 2011 16:00:41 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: hugetlb: undo change to page mapcount in fault
 handler

On Fri, 23 Dec 2011 21:00:41 +0800
Hillf Danton <dhillf@...il.com> wrote:

> On Fri, Dec 23, 2011 at 12:36 AM, Michal Hocko <mhocko@...e.cz> wrote:
> >
> > The changelog is rather cryptic. What about something like:
> >
> 
> It is included in the following version, thanks.
> 
> ===CUT HERE===
> From: Hillf Danton <dhillf@...il.com>
> Subject: [PATCH] mm: hugetlb: undo change to page mapcount in fault handler
> 
> Page mapcount should be updated only if we are sure that the page ends
> up in the page table otherwise we would leak if we couldn't COW due to
> reservations or if idx is out of bounds.
> 
> Signed-off-by: Hillf Danton <dhillf@...il.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Reviewed-by: Michal Hocko <mhocko@...e.cz>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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