1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/namespace.h b/include/linux/namespace.h
index 9eca1558d72f..0e5a86f13b2f 100644
--- a/include/linux/namespace.h
+++ b/include/linux/namespace.h
@@ -12,13 +12,13 @@ struct namespace {
         struct rw_semaphore     sem;
 };
 
-extern void umount_tree(struct vfsmount *);
 extern int copy_namespace(int, struct task_struct *);
 extern void __put_namespace(struct namespace *namespace);
 
 static inline void put_namespace(struct namespace *namespace)
 {
-        if (atomic_dec_and_test(&namespace->count))
+        if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
+                /* releases vfsmount_lock */
                 __put_namespace(namespace);
 }