mnt_ns_release
DEFINE_FREE(mnt_ns_release, struct mnt_namespace *,
if (!IS_ERR(_T)) mnt_ns_release(_T))
mnt_ns_release(container_of(rcu, struct mnt_namespace, ns.ns_rcu));
struct mnt_namespace *ns __free(mnt_ns_release) = NULL;
mnt_ns_release(kls->ns);