Commit f6913f99 authored Aug 29, 2013 by Toshi Kani Committed by Rafael J. Wysocki Sep 25, 2013

hotplug / x86: Fix online state in cpu0 debug interface



_debug_hotplug_cpu() is a debug interface that puts cpu0 offline during
boot-up when CONFIG_DEBUG_HOTPLUG_CPU0 is set.  After cpu0 is put offline
in this interface, however, /sys/devices/system/cpu/cpu0/online still
shows 1 (online).

This patch fixes _debug_hotplug_cpu() to update dev->offline when CPU
online/offline operation succeeded.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 4a10c2ac

arch/x86/kernel/topology.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -72,16 +72,19 @@ int __ref _debug_hotplug_cpu(int cpu, int action)
		ret = cpu_down(cpu);
		if (!ret) {
		pr_info("CPU %u is now offline\n", cpu);
		dev->offline = true;
		kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
		} else
		pr_debug("Can't offline CPU%d.\n", cpu);
		break;
		case 1:
		ret = cpu_up(cpu);
		if (!ret)
		if (!ret) {
		dev->offline = false;
		kobject_uevent(&dev->kobj, KOBJ_ONLINE);
		else
		} else {
		pr_debug("Can't online CPU%d.\n", cpu);
		}
		break;
		default:
		ret = -EINVAL;