add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kernel/topology.c
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@@ -31,6 +31,7 @@
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 #include <linux/init.h>
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 #include <linux/smp.h>
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 #include <linux/irq.h>
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+#include <asm/io_apic.h>
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 #include <asm/cpu.h>
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 static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
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@@ -59,38 +60,28 @@
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  */
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 int _debug_hotplug_cpu(int cpu, int action)
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 {
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-	struct device *dev = get_cpu_device(cpu);
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 	int ret;
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 	if (!cpu_is_hotpluggable(cpu))
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 		return -EINVAL;
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-	lock_device_hotplug();
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-
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 	switch (action) {
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 	case 0:
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-		ret = cpu_down(cpu);
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-		if (!ret) {
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-			pr_info("CPU %u is now offline\n", cpu);
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-			dev->offline = true;
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-			kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
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-		} else
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+		ret = remove_cpu(cpu);
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+		if (!ret)
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+			pr_info("DEBUG_HOTPLUG_CPU0: CPU %u is now offline\n", cpu);
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+		else
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 			pr_debug("Can't offline CPU%d.\n", cpu);
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 		break;
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 	case 1:
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-		ret = cpu_up(cpu);
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-		if (!ret) {
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-			dev->offline = false;
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-			kobject_uevent(&dev->kobj, KOBJ_ONLINE);
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-		} else {
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+		ret = add_cpu(cpu);
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+		if (ret)
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 			pr_debug("Can't online CPU%d.\n", cpu);
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-		}
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+
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 		break;
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 	default:
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 		ret = -EINVAL;
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 	}
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-
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-	unlock_device_hotplug();
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 	return ret;
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 }