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hotplug / x86: Fix online state in cpu0 debug interface

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_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>
This commit is contained in:
Toshi Kani 2013-08-29 18:22:06 -06:00 committed by Rafael J. Wysocki
parent 4a10c2ac2f
commit f6913f9902
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kernel/topology.c
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@ -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;