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    Subject[PATCH 22/75] mm/gup: Convert gup_huge_pmd() to use a folio
    Date
    Use the new folio-based APIs.

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Reviewed-by: Christoph Hellwig <hch@lst.de>
    Reviewed-by: John Hubbard <jhubbard@nvidia.com>
    Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
    Reviewed-by: William Kucharski <william.kucharski@oracle.com>
    ---
    mm/gup.c | 11 ++++++-----
    1 file changed, 6 insertions(+), 5 deletions(-)

    diff --git a/mm/gup.c b/mm/gup.c
    index 6faf8beb4cd9..ca8262392ce3 100644
    --- a/mm/gup.c
    +++ b/mm/gup.c
    @@ -2509,7 +2509,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
    unsigned long end, unsigned int flags,
    struct page **pages, int *nr)
    {
    - struct page *head, *page;
    + struct page *page;
    + struct folio *folio;
    int refs;

    if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
    @@ -2525,17 +2526,17 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
    page = nth_page(pmd_page(orig), (addr & ~PMD_MASK) >> PAGE_SHIFT);
    refs = record_subpages(page, addr, end, pages + *nr);

    - head = try_grab_compound_head(pmd_page(orig), refs, flags);
    - if (!head)
    + folio = try_grab_folio(page, refs, flags);
    + if (!folio)
    return 0;

    if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) {
    - put_compound_head(head, refs, flags);
    + gup_put_folio(folio, refs, flags);
    return 0;
    }

    *nr += refs;
    - SetPageReferenced(head);
    + folio_set_referenced(folio);
    return 1;
    }

    --
    2.34.1
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