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    Subject[PATCH v6 04/51] mm: Move PageDoubleMap bit
    Date
    From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

    PG_private_2 is defined as being PF_ANY (applicable to tail pages
    as well as regular & head pages). That means that the first tail
    page of a double-map page will appear to have Private2 set. Use the
    Workingset bit instead which is defined as PF_HEAD so any attempt to
    access the Workingset bit on a tail page will redirect to the head page's
    Workingset bit.

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    ---
    include/linux/page-flags.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
    index 222f6f7b2bb3..de6e0696f55c 100644
    --- a/include/linux/page-flags.h
    +++ b/include/linux/page-flags.h
    @@ -164,7 +164,7 @@ enum pageflags {
    PG_slob_free = PG_private,

    /* Compound pages. Stored in first tail page's flags */
    - PG_double_map = PG_private_2,
    + PG_double_map = PG_workingset,

    /* non-lru isolated movable page */
    PG_isolated = PG_reclaim,
    --
    2.26.2
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