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Date:   Sat, 5 Nov 2022 22:13:21 +0300
From:   "Kirill A. Shutemov" <kirill@shutemov.name>
To:     Hugh Dickins <hughd@google.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Matthew Wilcox <willy@infradead.org>,
        David Hildenbrand <david@redhat.com>,
        Vlastimil Babka <vbabka@suse.cz>, Peter Xu <peterx@redhat.com>,
        Yang Shi <shy828301@gmail.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Sidhartha Kumar <sidhartha.kumar@oracle.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Naoya Horiguchi <naoya.horiguchi@linux.dev>,
        Mina Almasry <almasrymina@google.com>,
        James Houghton <jthoughton@google.com>,
        Zach O'Keefe <zokeefe@google.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/3] mm,hugetlb: use folio fields in second tail page
Message-ID: <20221105191321.572bdm67tulpva5k@box>
References: <5f52de70-975-e94f-f141-543765736181@google.com>
 <3818cc9a-9999-d064-d778-9c94c5911e6@google.com>
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On Wed, Nov 02, 2022 at 06:48:45PM -0700, Hugh Dickins wrote:
> @@ -260,13 +267,16 @@ struct page {
>   *    to find how many references there are to this folio.
>   * @memcg_data: Memory Control Group data.
>   * @_flags_1: For large folios, additional page flags.
> - * @__head: Points to the folio.  Do not use.
> + * @_head_1: Points to the folio.  Do not use.
>   * @_folio_dtor: Which destructor to use for this folio.
>   * @_folio_order: Do not use directly, call folio_order().
>   * @_total_mapcount: Do not use directly, call folio_entire_mapcount().
>   * @_pincount: Do not use directly, call folio_maybe_dma_pinned().
>   * @_folio_nr_pages: Do not use directly, call folio_nr_pages().
> - * @_private_1: Do not use directly, call folio_get_private_1().

Looks like it misses

  + * @_flags_2: For large folios, additional page flags.
  + * @_head_2: Points to the folio.  Do not use.

to match the first tail page documentation.

Otherwise the patch looks good to me:

Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>


-- 
  Kiryl Shutsemau / Kirill A. Shutemov