mm: convert set_compound_page_dtor() and set_compound_order() to folios

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

Link: https://lkml.kernel.org/r/20230111142915.1001531-19-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3acf09d..836b96e 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -984,8 +984,11 @@ 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,
@@ -999,9 +1002,11 @@ 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
 }