[PATCH 10/17] gup: Convert gup_hugepte() to use a folio

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

There should be little to no effect from this patch; just removing
uses of some old APIs.

While I'm looking at this, take the opportunity to use nth_page()
instead of doing the arithmetic ourselves in case hugetlbfs pages
are ever allocated across memmap boundaries.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 mm/gup.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index d8535f9d5622..1c7fb668b46d 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2435,7 +2435,7 @@ static int record_subpages(struct page *page, unsigned long addr,
 	int nr;
 
 	for (nr = 0; addr != end; addr += PAGE_SIZE)
-		pages[nr++] = page++;
+		pages[nr++] = nth_page(page, nr);
 
 	return nr;
 }
@@ -2453,7 +2453,8 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
 		       struct page **pages, int *nr)
 {
 	unsigned long pte_end;
-	struct page *head, *page;
+	struct page *page;
+	struct folio *folio;
 	pte_t pte;
 	int refs;
 
@@ -2469,21 +2470,20 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
 	/* hugepages are never "special" */
 	VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
 
-	head = pte_page(pte);
-	page = head + ((addr & (sz-1)) >> PAGE_SHIFT);
+	page = nth_page(pte_page(pte), (addr & (sz - 1)) >> PAGE_SHIFT);
 	refs = record_subpages(page, addr, end, pages + *nr);
 
-	head = try_grab_compound_head(head, refs, flags);
-	if (!head)
+	folio = try_grab_folio(page, refs, flags);
+	if (!folio)
 		return 0;
 
 	if (unlikely(pte_val(pte) != pte_val(*ptep))) {
-		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