ns: Extend ns_desc to carry the length of the ns name

This will be needed for fast parsing of procfs ns references.

[ xemul: Add user_ns_desc here ]

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

ipc_ns.c

@@ -938,7 +938,4 @@ int prepare_ipc_ns(int pid)
 	return 0;
 }
 
-struct ns_desc ipc_ns_desc = {
-	.cflag = CLONE_NEWIPC,
-	.str = "ipc",
-};
+struct ns_desc ipc_ns_desc = NS_DESC_ENTRY(CLONE_NEWIPC, "ipc");