static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
{
	struct task_struct *p = q->task;

	if (WARN(q->pi_state || q->rt_waiter, "refusing to wake PI futex\n"))
		return;

	/*
	 * Queue the task for later wakeup for after we've released
	 * the hb->lock. wake_q_add() grabs reference to p.
	 */
	wake_q_add(wake_q, p);
	__unqueue_futex(q);
	/*
	 * The waiting task can free the futex_q as soon as q->lock_ptr = NULL
	 * is written, without taking any locks. This is possible in the event
	 * of a spurious wakeup, for example. A memory barrier is required here
	 * to prevent the following store to lock_ptr from getting ahead of the
	 * plist_del in __unqueue_futex().
	 */
	smp_store_release(&q->lock_ptr, NULL);
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.