On Saturday, August 17, 2013 01:46:56 PM Toshi Kani wrote:
> _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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--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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