linux-kernel - [PATCH 3.2 61/94] mm: Export migrate_page_move_mapping and migrate_page

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Date:	Sat, 13 Aug 2016 18:42:58 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Richard Weinberger" <richard@....at>,
	"Christoph Hellwig" <hch@....de>
Subject: [PATCH 3.2 61/94] mm: Export migrate_page_move_mapping and
 migrate_page_copy

3.2.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....at>

commit 1118dce773d84f39ebd51a9fe7261f9169cb056e upstream.

Export these symbols such that UBIFS can implement
->migratepage.

Signed-off-by: Richard Weinberger <richard@....at>
Acked-by: Christoph Hellwig <hch@....de>
[bwh: Backported to 3.2: also change migrate_page_move_mapping() from
 static to extern, done as part of an earlier commit upstream]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 mm/migrate.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -294,7 +294,7 @@ static inline bool buffer_migrate_lock_b
  * 2 for pages with a mapping
  * 3 for pages with a mapping and PagePrivate/PagePrivate2 set.
  */
-static int migrate_page_move_mapping(struct address_space *mapping,
+int migrate_page_move_mapping(struct address_space *mapping,
 		struct page *newpage, struct page *page,
 		struct buffer_head *head, enum migrate_mode mode)
 {
@@ -377,6 +377,7 @@ static int migrate_page_move_mapping(str
 
 	return 0;
 }
+EXPORT_SYMBOL(migrate_page_move_mapping);
 
 /*
  * The expected number of remaining references is the same as that
@@ -476,6 +477,7 @@ void migrate_page_copy(struct page *newp
 	if (PageWriteback(newpage))
 		end_page_writeback(newpage);
 }
+EXPORT_SYMBOL(migrate_page_copy);
 
 /************************************************************
  *                    Migration functions
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -43,6 +43,9 @@ extern int migrate_vmas(struct mm_struct
 extern void migrate_page_copy(struct page *newpage, struct page *page);
 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
 				  struct page *newpage, struct page *page);
+extern int migrate_page_move_mapping(struct address_space *mapping,
+		struct page *newpage, struct page *page,
+		struct buffer_head *head, enum migrate_mode mode);
 #else
 #define PAGE_MIGRATION 0