p->signal->real_timer.expires = jiffies + interval;
p->signal->real_timer.expires = jiffies + interval + 1;
static inline void it_real_arm(struct task_struct *p, unsigned long interval){	p->signal->it_real_value = interval; /* XXX unnecessary field?? */	if (interval == 0)		return;	if (interval > (unsigned long) LONG_MAX)		interval = LONG_MAX;	p->signal->real_timer.expires = jiffies + interval;	add_timer(&p->signal->real_timer);}