[PATCH v2 01/46] mm: Add folio_to_pfn()

[Matthew Wilcox (Oracle)]

The pfn of a folio is the pfn of its head page.

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

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9b7030d1899f..2c7b6ae1d3fc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1619,6 +1619,11 @@ static inline unsigned long page_to_section(const struct page *page)
 }
 #endif
 
+static inline unsigned long folio_to_pfn(struct folio *folio)
+{
+	return page_to_pfn(&folio->page);
+}
+
 /* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
 #ifdef CONFIG_MIGRATION
 static inline bool is_pinnable_page(struct page *page)
-- 
2.30.2