spin_unlock_irqrestore(&kprobe_lock, flags);
spin_unlock_irqrestore(&kretprobe_lock, flags);
void __kprobes unregister_kretprobe(struct kretprobe *rp){	unsigned long flags;	struct kretprobe_instance *ri;	unregister_kprobe(&rp->kp);	/* No race here */	spin_lock_irqsave(&kprobe_lock, flags);	free_rp_inst(rp);	while ((ri = get_used_rp_inst(rp)) != NULL) {		ri->rp = NULL;		hlist_del(&ri->uflist);	}	spin_unlock_irqrestore(&kprobe_lock, flags);}