_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.k...@hp.com>
Acked-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
---
arch/x86/kernel/topology.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c
index 6e60b5f..5823bbd 100644
--- 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;
--
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