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>

diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c
index 6e60b5f..5823bbd 100644 (file)
--- a/arch/x86/kernel/topology.c
+++ b/arch/x86/kernel/topology.c
@@ -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;