[PATCH v7 03/28] mm: Add folio_pgdat and folio_zone

[Matthew Wilcox (Oracle)]

These are just convenience wrappers for callers with folios; pgdat and
zone can be reached from tail pages as well as head pages.

Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
Reviewed-by: Zi Yan <ziy at nvidia.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Acked-by: Jeff Layton <jlayton at kernel.org>
---
 include/linux/mm.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4ece80aa8d05..4c98b52613b7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1560,6 +1560,16 @@ static inline pg_data_t *page_pgdat(const struct page *page)
 	return NODE_DATA(page_to_nid(page));
 }
 
+static inline struct zone *folio_zone(const struct folio *folio)
+{
+	return page_zone(&folio->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)
 {
-- 
2.30.2