From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Richard Weinberger <richard@nod.at>
Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, hsiangkao@mail.ru,
kirill.shutemov@linux.intel.com, stable@vger.kernel.org,
zhangjun <openzhangj@gmail.com>
Subject: Re: [PATCH] ubifs: Get/put page when changing PG_private
Date: Fri, 21 Dec 2018 13:35:30 +0300 [thread overview]
Message-ID: <20181221103530.zahcs4gm5mlknhug@kshutemo-mobl1> (raw)
In-Reply-To: <386368225.TvJUPtmGVW@blindfold>
On Fri, Dec 21, 2018 at 09:56:25AM +0100, Richard Weinberger wrote:
> Am Samstag, 15. Dezember 2018, 16:01:30 CET schrieb Richard Weinberger:
> > The page migration code assumes that a page with PG_private
> > set has its page count elevated by 1.
> > UBIFS never did this and therefore the migration code was unable
> > to migrate some pages owned by UBIFS.
> > The lead to situations where the CMA memory allocator failed to
> > allocate memory.
> >
> > Fix this by using get/put_page when changing PG_private.
> >
> > Cc: <stable@vger.kernel.org>
> > Cc: zhangjun <openzhangj@gmail.com>
> > Fixes: 4ac1c17b2044 ("UBIFS: Implement ->migratepage()")
> > Reported-by: zhangjun <openzhangj@gmail.com>
> > Signed-off-by: Richard Weinberger <richard@nod.at>
>
> FYI, on the XFS side a similar change caused a regression.
> https://marc.info/?l=linux-fsdevel&m=154530861202448&w=2
>
> Until this regression is not fully understood, including the implications
> for UBIFS, I'll not merge this patch.
This looks like a reasonable resolution to me:
http://lkml.kernel.org/r/20181221093919.GA2337@lst.de
But let's wait the inclusion (or objection).
--
Kirill A. Shutemov
next prev parent reply other threads:[~2018-12-21 10:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-15 15:01 [PATCH] ubifs: Get/put page when changing PG_private Richard Weinberger
2018-12-15 20:38 ` zhangjun
2018-12-17 10:59 ` Kirill A. Shutemov
2018-12-17 11:32 ` Richard Weinberger
2018-12-21 8:56 ` Richard Weinberger
2018-12-21 10:35 ` Kirill A. Shutemov [this message]
2018-12-25 2:42 ` zhangjun
2018-12-25 21:08 ` Richard Weinberger
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