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From: Naoya Horiguchi To: Miaohe Lin Cc: akpm@linux-foundation.org, naoya.horiguchi@nec.com, shy828301@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/4] mm: memory-failure: avoid false hwpoison page mapped error info Message-ID: <20230719235035.GB1583723@ik1-406-35019.vs.sakura.ne.jp> References: <20230715031729.2420338-1-linmiaohe@huawei.com> <20230715031729.2420338-4-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230715031729.2420338-4-linmiaohe@huawei.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 9B31240019 X-Stat-Signature: a99z1byj6z3etqfahe9ng7zapojkqk1m X-Rspam-User: X-HE-Tag: 1689810644-957600 X-HE-Meta: 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 GK7A1IUB MWVi1VTXyNJ81i3UOH6Iz5lJ8zw6pty/PovmapzHH0nH+tyLbsU6r7vlYURcRsCfeGwkpTcldQbbzA+5MN/hhNsJ5Q/e+p25azo2p X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Jul 15, 2023 at 11:17:28AM +0800, Miaohe Lin wrote: > folio->_mapcount is overloaded in SLAB, so folio_mapped() has to be done > after folio_test_slab() is checked. Otherwise slab folio might be treated > as a mapped folio leading to false 'Someone maps the hwpoison page' error > info. > > Fixes: 230ac719c500 ("mm/hwpoison: don't try to unpoison containment-failed pages") > Signed-off-by: Miaohe Lin Acked-by: Naoya Horiguchi