int arch_prepare_kprobe(struct kprobe *p)
int __kprobes arch_prepare_kprobe(struct kprobe *p)
int arch_prepare_kprobe(struct kprobe *p){	/* insn: must be on special executable page on x86_64. */	up(&kprobe_mutex);	p->ainsn.insn = get_insn_slot();	down(&kprobe_mutex);	if (!p->ainsn.insn) {		return -ENOMEM;	}	return 0;}