[PATCH 12/17] gup: Convert gup_huge_pud() to use a folio

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Use the new folio-based APIs.  Also fix an assumption that memmap is
contiguous.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/gup.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index be965c965484..e7bcee8776e1 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2552,7 +2552,8 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, 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 (!pud_access_permitted(orig, flags & FOLL_WRITE))
@@ -2565,20 +2566,20 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
 					     pages, nr);
 	}
 
-	page = pud_page(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
+	page = nth_page(pud_page(orig), (addr & ~PUD_MASK) >> PAGE_SHIFT);
 	refs = record_subpages(page, addr, end, pages + *nr);
 
-	head = try_grab_compound_head(pud_page(orig), refs, flags);
-	if (!head)
+	folio = try_grab_folio(page, refs, flags);
+	if (!folio)
 		return 0;
 
 	if (unlikely(pud_val(orig) != pud_val(*pudp))) {
-		put_compound_head(head, refs, flags);
+		gup_put_folio(folio, refs, flags);
 		return 0;
 	}
 
 	*nr += refs;
-	SetPageReferenced(head);
+	folio_set_referenced(folio);
 	return 1;
 }
 
-- 
2.33.0