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Subject: Re: [PATCH 03/21] mm/hugetlb: correct demote page offset logic
From:   Muchun Song <muchun.song@linux.dev>
In-Reply-To: <20220913195508.3511038-4-opendmb@gmail.com>
Date:   Thu, 15 Sep 2022 09:40:34 +0800
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Mike Rapoport <rppt@kernel.org>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
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        Neeraj Upadhyay <quic_neeraju@quicinc.com>,
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References: <20220913195508.3511038-1-opendmb@gmail.com>
 <20220913195508.3511038-4-opendmb@gmail.com>
To:     Doug Berger <opendmb@gmail.com>
Precedence: bulk


> On Sep 14, 2022, at 03:54, Doug Berger <opendmb@gmail.com> wrote:
>=20
> With gigantic pages it may not be true that struct page structures
> are contiguous across the entire gigantic page. The mem_map_offset
> function is used here in place of direct pointer arithmetic to
> correct for this.
>=20
> Fixes: 8531fc6f52f5 ("hugetlb: add hugetlb demote page support")
> Signed-off-by: Doug Berger <opendmb@gmail.com>

With Matthew=E2=80=99s suggestion.

Acked-by: Muchun Song <songmuchun@bytedance.com>

Thanks.