Re: [PATCH v6 04/10] PM / EM: add support for other devices than CPUs in Energy Model

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Lukasz Luba writes:

+/**
+ * em_dev_unregister_perf_domain() - Unregister Energy Model (EM) for a device
+ * @dev		: Device for which the EM is registered
+ *
+ * Try to unregister the EM for the specified device (it checks current
+ * reference counter). The EM for CPUs will not be freed.
+ */
+void em_dev_unregister_perf_domain(struct device *dev)
+{
+	struct em_device *em_dev, *tmp;
+
+	if (IS_ERR_OR_NULL(dev))
+		return;
+
+	/* We don't support freeing CPU structures in hotplug */
+	if (_is_cpu_device(dev)) {
+ dev_dbg_once(dev, "EM: the structures are not going to be removed\n");
+		return;
+	}
+
+	mutex_lock(&em_pd_mutex);
+
+	if (list_empty(&em_pd_dev_list)) {
+		mutex_unlock(&em_pd_mutex);
+		return;
+	}
+
+ list_for_each_entry_safe(em_dev, tmp, &em_pd_dev_list, em_dev_list) {
+		if (em_dev->dev == dev) {
+			kref_put(&em_dev->kref, _em_release);
+			break;
+		}
+	}
+
+	mutex_unlock(&em_pd_mutex);
+}
+EXPORT_SYMBOL_GPL(em_dev_unregister_perf_domain);

Ok, so em_dev_unregister_perf_domain() does not support the CPU device
and a subsequent em_register_perf_domain() will fail with EEXIST.

Is there a way to unregister/change the CPU's energy model during
runtime without restarting the whole system?



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