From: Greg KH <greg@kroah.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
stable@kernel.org
Subject: Re: [stable] [PATCH] mm: PageBuddy and mapcount underflows robustness
Date: Wed, 23 Mar 2011 15:58:53 -0700 [thread overview]
Message-ID: <20110323225853.GH27334@kroah.com> (raw)
In-Reply-To: <alpine.LSU.2.00.1103181428100.1996@sister.anvils>
On Fri, Mar 18, 2011 at 02:34:03PM -0700, Hugh Dickins wrote:
> On Fri, 18 Mar 2011, Andrea Arcangeli wrote:
> > On Mon, Mar 14, 2011 at 10:30:11AM -0700, Linus Torvalds wrote:
> > Subject: mm: PageBuddy and mapcount robustness
> >
> > From: Andrea Arcangeli <aarcange@redhat.com>
> >
> > Change the _mapcount value indicating PageBuddy from -2 to -128 for
> > more robusteness against page_mapcount() undeflows.
> >
> > Use reset_page_mapcount instead of __ClearPageBuddy in bad_page to
> > ignore the previous retval of PageBuddy().
> >
> > Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> > Reported-by: Hugh Dickins <hughd@google.com>
>
> Yes, this version satisfies my objections too.
> I'd say Acked-by but I see that it's already in, great.
>
> I've Cc'ed stable@kernel.org: please can we have this in 2.6.38.1,
> since 2.6.38 regressed the recovery from bad page states,
> inadvertently changing them to a fatal error when CONFIG_DEBUG_VM.
Now queued up for 2.6.38.2, thanks.
greg k-h
WARNING: multiple messages have this Message-ID (diff)
From: Greg KH <greg@kroah.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
stable@kernel.org
Subject: Re: [stable] [PATCH] mm: PageBuddy and mapcount underflows robustness
Date: Wed, 23 Mar 2011 15:58:53 -0700 [thread overview]
Message-ID: <20110323225853.GH27334@kroah.com> (raw)
In-Reply-To: <alpine.LSU.2.00.1103181428100.1996@sister.anvils>
On Fri, Mar 18, 2011 at 02:34:03PM -0700, Hugh Dickins wrote:
> On Fri, 18 Mar 2011, Andrea Arcangeli wrote:
> > On Mon, Mar 14, 2011 at 10:30:11AM -0700, Linus Torvalds wrote:
> > Subject: mm: PageBuddy and mapcount robustness
> >
> > From: Andrea Arcangeli <aarcange@redhat.com>
> >
> > Change the _mapcount value indicating PageBuddy from -2 to -128 for
> > more robusteness against page_mapcount() undeflows.
> >
> > Use reset_page_mapcount instead of __ClearPageBuddy in bad_page to
> > ignore the previous retval of PageBuddy().
> >
> > Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> > Reported-by: Hugh Dickins <hughd@google.com>
>
> Yes, this version satisfies my objections too.
> I'd say Acked-by but I see that it's already in, great.
>
> I've Cc'ed stable@kernel.org: please can we have this in 2.6.38.1,
> since 2.6.38 regressed the recovery from bad page states,
> inadvertently changing them to a fatal error when CONFIG_DEBUG_VM.
Now queued up for 2.6.38.2, thanks.
greg k-h
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next prev parent reply other threads:[~2011-03-23 23:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-14 8:08 [PATCH] thp+memcg-numa: fix BUG at include/linux/mm.h:370! Hugh Dickins
2011-03-14 8:08 ` Hugh Dickins
2011-03-14 15:25 ` Minchan Kim
2011-03-14 15:25 ` Minchan Kim
2011-03-14 15:52 ` Andrea Arcangeli
2011-03-14 15:52 ` Andrea Arcangeli
2011-03-14 16:37 ` Hugh Dickins
2011-03-14 16:37 ` Hugh Dickins
2011-03-14 16:56 ` Linus Torvalds
2011-03-14 16:56 ` Linus Torvalds
2011-03-14 17:17 ` Andrea Arcangeli
2011-03-14 17:17 ` Andrea Arcangeli
2011-03-14 19:58 ` Johannes Weiner
2011-03-14 19:58 ` Johannes Weiner
2011-03-14 23:42 ` KAMEZAWA Hiroyuki
2011-03-14 23:42 ` KAMEZAWA Hiroyuki
2011-04-01 21:21 ` Andrea Arcangeli
2011-04-01 21:21 ` Andrea Arcangeli
2011-03-14 16:59 ` [PATCH] mm: PageBuddy and mapcount underflows robustness Andrea Arcangeli
2011-03-14 16:59 ` Andrea Arcangeli
2011-03-14 17:30 ` Linus Torvalds
2011-03-14 17:30 ` Linus Torvalds
2011-03-17 23:16 ` Andrea Arcangeli
2011-03-17 23:16 ` Andrea Arcangeli
2011-03-18 21:34 ` Hugh Dickins
2011-03-18 21:34 ` Hugh Dickins
2011-03-23 22:58 ` Greg KH [this message]
2011-03-23 22:58 ` [stable] " Greg KH
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