[PATCH 18/22] mm: Convert set_compound_page_dtor() and set_compound_order() to folios

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

Replace uses of compound_dtor, compound_order and compound_nr by
their folio equivalents.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/mm.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 75054fce8ec6..125a9138d754 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -979,8 +979,11 @@ extern compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS];
 static inline void set_compound_page_dtor(struct page *page,
 		enum compound_dtor_id compound_dtor)
 {
+	struct folio *folio = (struct folio *)page;
+
 	VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
-	page[1].compound_dtor = compound_dtor;
+	VM_BUG_ON_PAGE(!PageHead(page), page);
+	folio->_folio_dtor = compound_dtor;
 }
 
 static inline void folio_set_compound_dtor(struct folio *folio,
@@ -994,9 +997,11 @@ void destroy_large_folio(struct folio *folio);
 
 static inline void set_compound_order(struct page *page, unsigned int order)
 {
-	page[1].compound_order = order;
+	struct folio *folio = (struct folio *)page;
+
+	folio->_folio_order = order;
 #ifdef CONFIG_64BIT
-	page[1].compound_nr = 1U << order;
+	folio->_folio_nr_pages = 1U << order;
 #endif
 }
 
-- 
2.35.1