Foward declare struct ns_common and remove the include of ns_common.h.
We want ns_common.h to possibly include nstree structures but not the
other way around.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 include/linux/nstree.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/nstree.h b/include/linux/nstree.h
index 38674c6fa4f7..25040a98a92b 100644
--- a/include/linux/nstree.h
+++ b/include/linux/nstree.h
@@ -3,7 +3,6 @@
 #ifndef _LINUX_NSTREE_H
 #define _LINUX_NSTREE_H
 
-#include <linux/ns_common.h>
 #include <linux/nsproxy.h>
 #include <linux/rbtree.h>
 #include <linux/seqlock.h>
@@ -11,6 +10,8 @@
 #include <linux/cookie.h>
 #include <uapi/linux/nsfs.h>
 
+struct ns_common;
+
 extern struct ns_tree cgroup_ns_tree;
 extern struct ns_tree ipc_ns_tree;
 extern struct ns_tree mnt_ns_tree;

-- 
2.47.3