add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/cpuidle/cpuidle-arm.c
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@@ -1,16 +1,14 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ARM/ARM64 generic CPU idle driver.
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  *
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  * Copyright (C) 2014 ARM Ltd.
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  * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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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 version 2 as
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- * published by the Free Software Foundation.
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  */
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8
 
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 #define pr_fmt(fmt) "CPUidle arm: " fmt
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10
 
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+#include <linux/cpu_cooling.h>
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 #include <linux/cpuidle.h>
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 #include <linux/cpumask.h>
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 #include <linux/cpu_pm.h>
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@@ -18,7 +16,6 @@
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 #include <linux/module.h>
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 #include <linux/of.h>
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 #include <linux/slab.h>
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-#include <linux/topology.h>
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 #include <asm/cpuidle.h>
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21
 
..
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@@ -82,7 +79,6 @@
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 {
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 	int ret;
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 	struct cpuidle_driver *drv;
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-	struct cpuidle_device *dev;
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 	drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
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 	if (!drv)
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@@ -110,42 +106,29 @@
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 	ret = arm_cpuidle_init(cpu);
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 	/*
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-	 * Allow the initialization to continue for other CPUs, if the reported
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-	 * failure is a HW misconfiguration/breakage (-ENXIO).
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+	 * Allow the initialization to continue for other CPUs, if the
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+	 * reported failure is a HW misconfiguration/breakage (-ENXIO).
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+	 *
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+	 * Some platforms do not support idle operations
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+	 * (arm_cpuidle_init() returning -EOPNOTSUPP), we should
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+	 * not flag this case as an error, it is a valid
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+	 * configuration.
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 	 */
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 	if (ret) {
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-		pr_err("CPU %d failed to init idle CPU ops\n", cpu);
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+		if (ret != -EOPNOTSUPP)
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+			pr_err("CPU %d failed to init idle CPU ops\n", cpu);
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 		ret = ret == -ENXIO ? 0 : ret;
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 		goto out_kfree_drv;
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 	}
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-	ret = cpuidle_register_driver(drv);
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-	if (ret) {
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-		if (ret != -EBUSY)
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-			pr_err("Failed to register cpuidle driver\n");
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+	ret = cpuidle_register(drv, NULL);
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+	if (ret)
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 		goto out_kfree_drv;
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-	}
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-	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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-	if (!dev) {
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-		ret = -ENOMEM;
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-		goto out_unregister_drv;
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-	}
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-	dev->cpu = cpu;
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-
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-	ret = cpuidle_register_device(dev);
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-	if (ret) {
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-		pr_err("Failed to register cpuidle device for CPU %d\n",
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-		       cpu);
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-		goto out_kfree_dev;
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-	}
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+	cpuidle_cooling_register(drv);
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 	return 0;
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-out_kfree_dev:
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-	kfree(dev);
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-out_unregister_drv:
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-	cpuidle_unregister_driver(drv);
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 out_kfree_drv:
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 	kfree(drv);
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 	return ret;
..
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@@ -176,9 +159,7 @@
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 	while (--cpu >= 0) {
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 		dev = per_cpu(cpuidle_devices, cpu);
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 		drv = cpuidle_get_cpu_driver(dev);
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-		cpuidle_unregister_device(dev);
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-		cpuidle_unregister_driver(drv);
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-		kfree(dev);
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+		cpuidle_unregister(drv);
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 		kfree(drv);
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 	}
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