Reiser4 is trying to add/remove pages to/from address space, so it needs

add_to_page_cache_lru to be EXPORT_SYMBOL-ed.

[bunk@stusta.de: unexport {,__}remove_from_page_cache]
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/filemap.c

@@ -311,6 +311,7 @@ int wait_on_page_writeback_range(struct address_space *mapping,
 
 	return ret;
 }
+EXPORT_SYMBOL(add_to_page_cache_lru);
 
 /**
  * sync_page_range - write and wait on all pages in the passed range