struct pid_namespace init_pid_ns = {
    .kref = {
                .refcount       = ATOMIC_INIT(2),
        },
        .pidmap = {
                [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
        },
        .last_pid = 0,
        .level = 0,
        .child_reaper = &init_task,
};