[01/22] mm: Add folios_put()

Commit Message

Matthew Wilcox June 17, 2022, 5:49 p.m. UTC

This is just a wrapper around release_pages() for now.  Place the
prototype in mm.h along with folio_put() and folio_put_refs().

Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
---
 include/linux/mm.h      | 19 +++++++++++++++++++
 include/linux/pagemap.h |  2 --
 2 files changed, 19 insertions(+), 2 deletions(-)

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 82b680261cf0..07a1998c3621 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1251,6 +1251,25 @@  static inline void folio_put_refs(struct folio *folio, int refs)
 		__put_page(&folio->page);
 }
 
+void release_pages(struct page **pages, int nr);
+
+/**
+ * folios_put - Decrement the reference count on an array of folios.
+ * @folios: The folios.
+ * @nr: How many folios there are.
+ *
+ * Like folio_put(), but for an array of folios.  This is more efficient
+ * than writing the loop yourself as it will optimise the locks which
+ * need to be taken if the folios are freed.
+ *
+ * Context: May be called in process or interrupt context, but not in NMI
+ * context.  May be called while holding a spinlock.
+ */
+static inline void folios_put(struct folio **folios, unsigned int nr)
+{
+	release_pages((struct page **)folios, nr);
+}
+
 static inline void put_page(struct page *page)
 {
 	struct folio *folio = page_folio(page);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 2a67c0ad7348..7c4748a62841 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -345,8 +345,6 @@  static inline void filemap_nr_thps_dec(struct address_space *mapping)
 #endif
 }
 
-void release_pages(struct page **pages, int nr);
-
 struct address_space *page_mapping(struct page *);
 struct address_space *folio_mapping(struct folio *);
 struct address_space *swapcache_mapping(struct folio *);