[PATCH v3 02/25] mm: Add folio_pgdat

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

This is just a convenience wrapper for callers with folios; pgdat can
be reached from tail pages as well as head pages.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/mm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index f20504017adf..7d787229dd40 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1503,6 +1503,11 @@ static inline pg_data_t *page_pgdat(const struct page *page)
 	return NODE_DATA(page_to_nid(page));
 }
 
+static inline pg_data_t *folio_pgdat(const struct folio *folio)
+{
+	return page_pgdat(&folio->page);
+}
+
 #ifdef SECTION_IN_PAGE_FLAGS
 static inline void set_page_section(struct page *page, unsigned long section)
 {
-- 
2.29.2