Re: [RFC] [PATCH] cpu_hotplug on IBM JS20 system

[Heiko Carstens <heiko.carstens@de.ibm.com>]

> Since we are not supported by hardware for cpu hotplug. I have developed
> the patch which will disable cpu hotplug on IBM bladecentre JS20. Please
> let me know your comments on this please.

> +extern  int cpu_hotplug_disabled;
> +extern  struct mutex cpu_add_remove_lock;
[...]
> +	if(rtas_stop_self_args.token == RTAS_UNKNOWN_SERVICE) {
> +		mutex_lock(&cpu_add_remove_lock);
> +		cpu_hotplug_disabled = 1;
> +		mutex_unlock(&cpu_add_remove_lock);
> +	}
> +
>  #endif /* CONFIG_HOTPLUG_CPU */
>  #ifdef CONFIG_RTAS_ERROR_LOGGING
>  	rtas_last_error_token = rtas_token("rtas-last-error");

You should add a function to kernel/cpu.c which you can call in order to
disable cpu hotplug instead of exporting its private data structures.
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