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    SubjectRe: [PATCH v3 2/4] mm/migration: remove unneeded lock page and PageMovable check
    On Wed, May 25, 2022 at 04:18:20PM +0800, Miaohe Lin wrote:
    > When non-lru movable page was freed from under us, __ClearPageMovable must
    > have been done. So we can remove unneeded lock page and PageMovable check
    > here. Also free_pages_prepare() will clear PG_isolated for us, so we can
    > further remove ClearPageIsolated as suggested by David.
    >
    > Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
    > Reviewed-by: Christoph Hellwig <hch@lst.de>

    Reviewed-by: Oscar Salvador <osalvador@suse.de>

    > ---
    > mm/migrate.c | 9 ++-------
    > 1 file changed, 2 insertions(+), 7 deletions(-)
    >
    > diff --git a/mm/migrate.c b/mm/migrate.c
    > index e88ebb88fa6f..337336115e43 100644
    > --- a/mm/migrate.c
    > +++ b/mm/migrate.c
    > @@ -1090,15 +1090,10 @@ static int unmap_and_move(new_page_t get_new_page,
    > return -ENOSYS;
    >
    > if (page_count(page) == 1) {
    > - /* page was freed from under us. So we are done. */
    > + /* Page was freed from under us. So we are done. */
    > ClearPageActive(page);
    > ClearPageUnevictable(page);
    > - if (unlikely(__PageMovable(page))) {
    > - lock_page(page);
    > - if (!PageMovable(page))
    > - ClearPageIsolated(page);
    > - unlock_page(page);
    > - }
    > + /* free_pages_prepare() will clear PG_isolated. */
    > goto out;
    > }
    >
    > --
    > 2.23.0
    >
    >

    --
    Oscar Salvador
    SUSE Labs

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