mm: declare some external symbols

Declare 'bdi_pending_list' and 'tag_pages_for_writeback()' to remove
following sparse warnings:

 mm/backing-dev.c:46:1: warning: symbol 'bdi_pending_list' was not declared. Should it be static?
 mm/page-writeback.c:825:6: warning: symbol 'tag_pages_for_writeback' was not declared. Should it be static?

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 72a5d647a5f2..c7299d2ace6b 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -149,6 +149,8 @@ int write_cache_pages(struct address_space *mapping,
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
 void set_page_dirty_balance(struct page *page, int page_mkwrite);
 void writeback_set_ratelimit(void);
+void tag_pages_for_writeback(struct address_space *mapping,
+                             pgoff_t start, pgoff_t end);
 
 /* pdflush.c */
 extern int nr_pdflush_threads;  /* Global so it can be exported to sysctl