mm/gup: Convert gup_huge_pgd() to use a folio

Use the new folio-based APIs.  This was the last user of
try_grab_compound_head(), so remove it.

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>

diff --git a/mm/gup.c b/mm/gup.c
index b6ca236..23b83bc 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -133,12 +133,6 @@ struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags)
        return NULL;
 }
 
-static inline struct page *try_grab_compound_head(struct page *page,
-               int refs, unsigned int flags)
-{
-       return &try_grab_folio(page, refs, flags)->page;
-}
-
 static void gup_put_folio(struct folio *folio, int refs, unsigned int flags)
 {
        if (flags & FOLL_PIN) {
@@ -2560,7 +2554,8 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr,
                        struct page **pages, int *nr)
 {
        int refs;
-       struct page *head, *page;
+       struct page *page;
+       struct folio *folio;
 
        if (!pgd_access_permitted(orig, flags & FOLL_WRITE))
                return 0;
@@ -2570,17 +2565,17 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr,
        page = nth_page(pgd_page(orig), (addr & ~PGDIR_MASK) >> PAGE_SHIFT);
        refs = record_subpages(page, addr, end, pages + *nr);
 
-       head = try_grab_compound_head(pgd_page(orig), refs, flags);
-       if (!head)
+       folio = try_grab_folio(page, refs, flags);
+       if (!folio)
                return 0;
 
        if (unlikely(pgd_val(orig) != pgd_val(*pgdp))) {
-               put_compound_head(head, refs, flags);
+               gup_put_folio(folio, refs, flags);
                return 0;
        }
 
        *nr += refs;
-       SetPageReferenced(head);
+       folio_set_referenced(folio);
        return 1;
 }