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[v14,01/39] mm: Add folio_pfn()

Message ID	20210715200030.899216-2-willy@infradead.org (mailing list archive)
State	New
Headers	show Return-Path: <SRS0=osCV=MH=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE2C2613BB From: "Matthew Wilcox (Oracle)" <willy@infradead.org> To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Subject: [PATCH v14 01/39] mm: Add folio_pfn() Date: Thu, 15 Jul 2021 20:59:52 +0100 Message-Id: <20210715200030.899216-2-willy@infradead.org> In-Reply-To: <20210715200030.899216-1-willy@infradead.org> References: <20210715200030.899216-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	Memory folios: Pagecache edition \| expand [v14c,00/39] Memory folios: Pagecache edition [v14,01/39] mm: Add folio_pfn() [v14,02/39] mm: Add folio_raw_mapping() [v14,03/39] mm: Add flush_dcache_folio() [v14,04/39] mm: Add kmap_local_folio() [v14,05/39] mm: Add arch_make_folio_accessible() [v14,06/39] mm: Add folio_young and folio_idle [v14,07/39] mm/swap: Add folio_activate() [v14,08/39] mm/swap: Add folio_mark_accessed() [v14,09/39] mm/rmap: Add folio_mkclean() [v14,10/39] mm/migrate: Add folio_migrate_mapping() [v14,11/39] mm/migrate: Add folio_migrate_flags() [v14,12/39] mm/migrate: Add folio_migrate_copy() [v14,13/39] mm/writeback: Rename __add_wb_stat() to wb_stat_mod() [v14,14/39] flex_proportions: Allow N events instead of 1 [v14,15/39] mm/writeback: Change __wb_writeout_inc() to __wb_writeout_add() [v14,16/39] mm/writeback: Add __folio_end_writeback() [v14,17/39] mm/writeback: Add folio_start_writeback() [v14,18/39] mm/writeback: Add folio_mark_dirty() [v14,19/39] mm/writeback: Add __folio_mark_dirty() [v14,20/39] mm/writeback: Convert tracing writeback_page_template to folios [v14,21/39] mm/writeback: Add filemap_dirty_folio() [v14,22/39] mm/writeback: Add folio_account_cleaned() [v14,23/39] mm/writeback: Add folio_cancel_dirty() [v14,24/39] mm/writeback: Add folio_clear_dirty_for_io() [v14,25/39] mm/writeback: Add folio_account_redirty() [v14,26/39] mm/writeback: Add folio_redirty_for_writepage() [v14,27/39] mm/filemap: Add i_blocks_per_folio() [v14,28/39] mm/filemap: Add folio_mkwrite_check_truncate() [v14,29/39] mm/filemap: Add readahead_folio() [v14,30/39] mm/workingset: Convert workingset_refault() to take a folio [v14,31/39] mm: Add folio_evictable() [v14,32/39] mm/lru: Convert __pagevec_lru_add_fn to take a folio [v14,33/39] mm/lru: Add folio_add_lru() [v14,34/39] mm/page_alloc: Add folio allocation functions [v14,35/39] mm/filemap: Add filemap_alloc_folio [v14,36/39] mm/filemap: Add filemap_add_folio() [v14,37/39] mm/filemap: Convert mapping_get_entry to return a folio [v14,38/39] mm/filemap: Add filemap_get_folio [v14,39/39] mm/filemap: Add FGP_STABLE

Commit Message

Matthew Wilcox July 15, 2021, 7:59 p.m. UTC

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 mbox series

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c6e2a1682a6d..89daae93aa9b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1623,6 +1623,20 @@  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)