Re: [patch 5/8] x86_64:Dont do broadcast IPIs when hotplug is enabled in flat mode.

[Andi Kleen]

>  static void flat_send_IPI_allbutself(int vector)
>  {
> +#ifndef CONFIG_HOTPLUG_CPU
>  	if (((num_online_cpus()) - 1) >= 1)
>  		__send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
> +#else
> +	cpumask_t allbutme = cpu_online_map;
> +	int me = get_cpu(); /* Ensure we are not preempted when we clear */
> +	cpu_clear(me, allbutme);
> +	flat_send_IPI_mask(allbutme, vector);
> +	put_cpu();

This still needs the num_online_cpus()s check.

-Andi
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