From: Mel Gorman <mgorman@techsingularity.net>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Naoya Horiguchi <nao.horiguchi@gmail.com>
Subject: Re: [PATCH v2] mm: check_new_page_bad() directly returns in __PG_HWPOISON case
Date: Wed, 18 May 2016 15:03:37 +0100 [thread overview]
Message-ID: <20160518140337.GG2527@techsingularity.net> (raw)
In-Reply-To: <20160518100949.GA17299@hori1.linux.bs1.fc.nec.co.jp>
On Wed, May 18, 2016 at 10:09:50AM +0000, Naoya Horiguchi wrote:
> From c600b1ee6c36b3df6973f5365b4179c92f3c08e3 Mon Sep 17 00:00:00 2001
> From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Date: Wed, 18 May 2016 18:42:57 +0900
> Subject: [PATCH v2] mm: check_new_page_bad() directly returns in __PG_HWPOISON
> case
>
> Currently we check page->flags twice for "HWPoisoned" case of
> check_new_page_bad(), which can cause a race with unpoisoning.
> This race unnecessarily taints kernel with "BUG: Bad page state".
> check_new_page_bad() is the only caller of bad_page() which is interested
> in __PG_HWPOISON, so let's move the hwpoison related code in bad_page()
> to it.
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2016-05-18 14:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-17 7:42 [PATCH v1] mm: bad_page() checks bad_flags instead of page->flags for hwpoison page Naoya Horiguchi
2016-05-18 7:30 ` Vlastimil Babka
2016-05-18 9:21 ` Mel Gorman
2016-05-18 9:31 ` Vlastimil Babka
2016-05-18 9:52 ` Mel Gorman
2016-05-18 10:17 ` Naoya Horiguchi
2016-05-18 10:09 ` [PATCH v2] mm: check_new_page_bad() directly returns in __PG_HWPOISON case Naoya Horiguchi
2016-05-18 14:03 ` Mel Gorman [this message]
2016-05-20 14:27 ` Vlastimil Babka
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