[PATCH v13 051/137] mm: Add folio_pfn()
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2021-07-12 03:35:23
Also in:
linux-fsdevel, lkml
Subsystem:
memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
This is the folio equivalent of page_to_pfn(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- include/linux/mm.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 80f27eb151ba..fa5974870660 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -1622,6 +1622,20 @@ static inline unsigned long page_to_section(const struct page *page) } #endif +/** + * folio_pfn - Return the Page Frame Number of a folio. + * @folio: The folio. + * + * A folio may contain multiple pages. The pages have consecutive + * Page Frame Numbers. + * + * Return: The Page Frame Number of the first page in the folio. + */ +static inline unsigned long folio_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