On Thu, Aug 23, 2012 at 05:56:04PM -0700, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua...@intel.com>
>
Ditto for too long Subject line and missing commit message.
> Signed-off-by: Fenghua Yu <fenghua...@intel.com>
> ---
> arch/x86/power/cpu.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 44 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
> index 218cdb1..3338609 100644
> --- a/arch/x86/power/cpu.c
> +++ b/arch/x86/power/cpu.c
> @@ -237,3 +237,47 @@ void restore_processor_state(void)
> #ifdef CONFIG_X86_32
> EXPORT_SYMBOL(restore_processor_state);
> #endif
> +
> +/*
> + * When bsp_check() is called in hibernate and suspend, cpu hotplug
> + * is disabled already. So it's unnessary to handle race condition between
> + * cpumask query and cpu hotplug.
> + */
> +static int bsp_check(void)
> +{
> + if (cpumask_first(cpu_online_mask) != 0) {
> + printk(KERN_WARNING "CPU0 is offline.\n");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static int bsp_pm_callback(struct notifier_block *nb, unsigned long action,
> + void *ptr)
> +{
> + int ret = 0;
> +
> + switch (action) {
> + case PM_SUSPEND_PREPARE:
> + case PM_HIBERNATION_PREPARE:
> + ret = bsp_check();
> + break;
> + default:
> + break;
> + }
> + return notifier_from_errno(ret);
> +}
> +
> +static int __init bsp_pm_check_init(void)
> +{
> + /*
> + * Set this bsp_pm_callback as lower priority than
> + * cpu_hotplug_pm_callback. So cpu_hotplug_pm_callback will be called
> + * earlier to disable cpu hotplug before bsp online check.
> + */
> + pm_notifier(bsp_pm_callback, -INT_MAX);
> + return 0;
> +}
> +
> +core_initcall(bsp_pm_check_init);
> --
> 1.7.2
>
> --
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--
Regards/Gruss,
Boris.
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