ipc: support ns lookup

Support the generic ns lookup infrastructure to support file handles for
namespaces.

Signed-off-by: Christian Brauner <brauner@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index a9310b6dbbc3..3db36773dd10 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -45,6 +45,7 @@
 #include <linux/mount.h>
 #include <linux/ipc_namespace.h>
 #include <linux/rhashtable.h>
+#include <linux/nstree.h>
 
 #include <linux/uaccess.h>
 
@@ -148,6 +149,7 @@ void shm_exit_ns(struct ipc_namespace *ns)
 static int __init ipc_ns_init(void)
 {
 	shm_init_ns(&init_ipc_ns);
+	ns_tree_add(&init_ipc_ns);
 	return 0;
 }