[v4,02/25] mm: Add folio_pgdat and folio_zone

Commit Message

Matthew Wilcox (Oracle) March 5, 2021, 4:18 a.m. UTC

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) <[e-mail]>
Reviewed-by: Zi Yan <[e-mail]>
---
 include/linux/mm.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a46e5a4385b0..ecfe202aa4ec 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1488,6 +1488,16 @@  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)
 {