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    Subject[PATCH 14/16] mm/huge_memory: fix comment of page_deferred_list
    Date
    The current comment is confusing because if global or memcg deferred list
    in the second tail page is occupied by compound_head, why we still use
    page[2].deferred_list here? I think it wants to say that Global or memcg
    deferred list in the first tail page is occupied by compound_mapcount and
    compound_pincount so we use the second tail page's deferred_list instead.

    Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
    ---
    include/linux/huge_mm.h | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
    index 12b297f9951d..2e8062b3417a 100644
    --- a/include/linux/huge_mm.h
    +++ b/include/linux/huge_mm.h
    @@ -294,8 +294,8 @@ static inline bool thp_migration_supported(void)
    static inline struct list_head *page_deferred_list(struct page *page)
    {
    /*
    - * Global or memcg deferred list in the second tail pages is
    - * occupied by compound_head.
    + * Global or memcg deferred list in the first tail page is
    + * occupied by compound_mapcount and compound_pincount.
    */
    return &page[2].deferred_list;
    }
    --
    2.23.0
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