linux-kernel - [PATCH v2 01/46] mm: Add folio_to

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Date:   Tue, 22 Jun 2021 13:15:06 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     akpm@...ux-foundation.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/46] mm: Add folio_to_pfn()

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

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 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