[v12,03/33] mm: Add folio_pgdat(), folio_zone() and folio_zonenum()

Commit Message

Matthew Wilcox June 22, 2021, 11:40 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.  No change
to generated code.

Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
Reviewed-by: Zi Yan <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Acked-by: Jeff Layton <[e-mail]>
Acked-by: Kirill A. Shutemov <[e-mail]>
Acked-by: Vlastimil Babka <[e-mail]>
Reviewed-by: William Kucharski <[e-mail]>
Reviewed-by: David Howells <[e-mail]>
---
 include/linux/mm.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index cba7bc223a9b..f0025bd2c2ad 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1145,6 +1145,11 @@  static inline enum zone_type page_zonenum(const struct page *page)
 	return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
 }
 
+static inline enum zone_type folio_zonenum(const struct folio *folio)
+{
+	return page_zonenum(&folio->page);
+}
+
 #ifdef CONFIG_ZONE_DEVICE
 static inline bool is_zone_device_page(const struct page *page)
 {
@@ -1560,6 +1565,16 @@  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)
 {