Add the missing include of the ns_common header.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 include/linux/cgroup_namespace.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/cgroup_namespace.h b/include/linux/cgroup_namespace.h
index b7dbf4d623d2..81ccbdee425b 100644
--- a/include/linux/cgroup_namespace.h
+++ b/include/linux/cgroup_namespace.h
@@ -2,6 +2,8 @@
 #ifndef _LINUX_CGROUP_NAMESPACE_H
 #define _LINUX_CGROUP_NAMESPACE_H
 
+#include <linux/ns_common.h>
+
 struct cgroup_namespace {
 	struct ns_common	ns;
 	struct user_namespace	*user_ns;

-- 
2.47.3