userns: Use cred->user_ns instead of cred->user->user_ns

Optimize performance and prepare for the removal of the user_ns reference
from user_struct.  Remove the slow long walk through cred->user->user_ns and
instead go straight to cred->user_ns.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ipc/namespace.c b/ipc/namespace.c
index ce0a647869b1..f362298c5ce4 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -46,7 +46,7 @@ static struct ipc_namespace *create_ipc_ns(struct task_struct *tsk,
         ipcns_notify(IPCNS_CREATED);
         register_ipcns_notifier(ns);
 
-        ns->user_ns = get_user_ns(task_cred_xxx(tsk, user)->user_ns);
+        ns->user_ns = get_user_ns(task_cred_xxx(tsk, user_ns));
 
         return ns;
 }