[PATCH v14 003/138] mm: Add folio_pgdat(), folio_zone() and folio_zonenum()

Matthew Wilcox (Oracle)
2021-07-15T03:40:00Z

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) <willy@infradead.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: David Howells <dhowells@redhat.com>
---
include/linux/mm.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5071084a71b9..0e14ac29a3e9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1144,6 +1144,11 @@ 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)
{
@@ -1559,6 +1564,16 @@ 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