linux-kernel - Re: [PATCH v2 11/11] mm/migration: fix possible do_pages_stat

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Message-ID: <CAMZfGtWQO3RAX+86O8=_gbiaWfNvxztfMY4S6zBsaVFDEFJPFQ@mail.gmail.com>
Date:   Fri, 18 Mar 2022 14:59:40 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
        baolin.wang@...ux.alibaba.com, Huang Ying <ying.huang@...el.com>,
        Alistair Popple <apopple@...dia.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 11/11] mm/migration: fix possible do_pages_stat_array
 racing with memory offline

On Thu, Mar 17, 2022 at 10:42 PM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> When follow_page peeks a page, the page could be migrated and then be
> offlined while it's still being used by the do_pages_stat_array().
> Use FOLL_GET to hold the page refcnt to fix this potential race.
>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>