linux-kernel - Re: [PATCH 3/4] mm: memory-failure: avoid false hwpoison page mapped error info

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Message-ID: <ZLIZil71OXXk8amg@casper.infradead.org>
Date:   Sat, 15 Jul 2023 04:59:06 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, naoya.horiguchi@....com,
        shy828301@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] mm: memory-failure: avoid false hwpoison page mapped
 error info

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 <linmiaohe@...wei.com>

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>