On 08/06/2018 06:39 PM, Patrick Bellasi wrote:

[...]

+/**
+ * uclamp_task_active: check if a task is currently clamping a CPU
+ * @p: the task to check
+ *
+ * A task actively affects the utilization clamp of a CPU if:
+ * - it's currently enqueued or running on that CPU
+ * - it's refcounted in at least one clamp group of that CPU
+ *
+ * Return: true if p is currently clamping the utilization of its CPU.
+ */
+static inline bool uclamp_task_active(struct task_struct *p)
+{
+	struct rq *rq = task_rq(p);
+	int clamp_id;
+
+	lockdep_assert_held(&p->pi_lock);
+	lockdep_assert_held(&rq->lock);
+
+	if (!task_on_rq_queued(p) && !p->on_cpu)
+		return false;
+
+	for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id) {
+		if (uclamp_task_affects(p, clamp_id))
+			return true;
+	}
+
+	return false;
+}

Looks like that uclamp_task_active() is only used once (in 
uclamp_task_update_active()). Can you not code the if condition and the 
for loop directly in uclamp_task_update_active()? This would save code 
(lockdep_assert_held() etc.) and comment lines.

[...]