gup: convert FOLL_TOUCH case in follow_page_pte() to folio

We already have the folio here, so just use it, removing three hidden
calls to compound_head().

Link: https://lkml.kernel.org/r/20241002151403.1345296-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/gup.c

@@ -922,14 +922,14 @@ static struct page *follow_page_pte(struct vm_area_struct *vma,
 	}
 	if (flags & FOLL_TOUCH) {
 		if ((flags & FOLL_WRITE) &&
-		    !pte_dirty(pte) && !PageDirty(page))
-			set_page_dirty(page);
+		    !pte_dirty(pte) && !folio_test_dirty(folio))
+			folio_mark_dirty(folio);
 		/*
 		 * pte_mkyoung() would be more correct here, but atomic care
 		 * is needed to avoid losing the dirty bit: it is easier to use
-		 * mark_page_accessed().
+		 * folio_mark_accessed().
 		 */
-		mark_page_accessed(page);
+		folio_mark_accessed(folio);
 	}
 out:
 	pte_unmap_unlock(ptep, ptl);