RSEQ_CPU_ID_UNINITIALIZED
t->rseq.ids.cpu_id = RSEQ_CPU_ID_UNINITIALIZED;
unsafe_put_user(RSEQ_CPU_ID_UNINITIALIZED, &rseq->cpu_id, efault);
unsafe_put_user(RSEQ_CPU_ID_UNINITIALIZED, &rseq->cpu_id_start, efault);
unsafe_put_user(RSEQ_CPU_ID_UNINITIALIZED, &rseq->cpu_id, efault);
.cpu_id = RSEQ_CPU_ID_UNINITIALIZED,
my_rseq.cpu_id = RSEQ_CPU_ID_UNINITIALIZED;