mm: export remove_from_page_cache() to modules

This is needed to enable moving pages into the page cache in fuse with
splice(..., SPLICE_F_MOVE).

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
diff --git a/mm/filemap.c b/mm/filemap.c
index 140ebda..09a91a9 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -151,6 +151,7 @@
 	spin_unlock_irq(&mapping->tree_lock);
 	mem_cgroup_uncharge_cache_page(page);
 }
+EXPORT_SYMBOL(remove_from_page_cache);
 
 static int sync_page(void *word)
 {