add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/acpi/processor_driver.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * processor_driver.c - ACPI Processor Driver
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  *
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@@ -8,20 +9,6 @@
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  *  			- Added processor hotplug support
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  *  Copyright (C) 2013, Intel Corporation
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  *                      Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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- *
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- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or (at
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- *  your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful, but
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- *  WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- *  General Public License for more details.
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- *
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- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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  */
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 #include <linux/kernel.h>
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@@ -297,6 +284,28 @@
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 	return 0;
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 }
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+bool acpi_processor_cpufreq_init;
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+
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+static int acpi_processor_notifier(struct notifier_block *nb,
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+				   unsigned long event, void *data)
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+{
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+	struct cpufreq_policy *policy = data;
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+
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+	if (event == CPUFREQ_CREATE_POLICY) {
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+		acpi_thermal_cpufreq_init(policy);
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+		acpi_processor_ppc_init(policy);
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+	} else if (event == CPUFREQ_REMOVE_POLICY) {
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+		acpi_processor_ppc_exit(policy);
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+		acpi_thermal_cpufreq_exit(policy);
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+	}
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+
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+	return 0;
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+}
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+
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+static struct notifier_block acpi_processor_notifier_block = {
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+	.notifier_call = acpi_processor_notifier,
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+};
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+
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 /*
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  * We keep the driver loaded even when ACPI is not running.
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  * This is needed for the powernow-k8 driver, that works even without
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@@ -323,8 +332,12 @@
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 	cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
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 				  NULL, acpi_soft_cpu_dead);
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-	acpi_thermal_cpufreq_init();
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-	acpi_processor_ppc_init();
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+	if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
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+				       CPUFREQ_POLICY_NOTIFIER)) {
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+		acpi_processor_cpufreq_init = true;
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+		acpi_processor_ignore_ppc_init();
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+	}
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+
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 	acpi_processor_throttling_init();
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 	return 0;
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 err:
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@@ -337,8 +350,12 @@
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 	if (acpi_disabled)
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 		return;
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-	acpi_processor_ppc_exit();
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-	acpi_thermal_cpufreq_exit();
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+	if (acpi_processor_cpufreq_init) {
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+		cpufreq_unregister_notifier(&acpi_processor_notifier_block,
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+					    CPUFREQ_POLICY_NOTIFIER);
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+		acpi_processor_cpufreq_init = false;
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+	}
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+
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 	cpuhp_remove_state_nocalls(hp_online);
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 	cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
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 	driver_unregister(&acpi_processor_driver);