Re: [RFC 5/6]clean cpu state after hotremove CPU

[Zwane Mwaikambo <zwane@arm.linux.org.uk>]

On Mon, 4 Apr 2005, Li Shaohua wrote:

> Clean up all CPU states including its runqueue and idle thread, 
> so we can use boot time code without any changes.
> Note this makes /sys/devices/system/cpu/cpux/online unworkable.
>  
>  #ifdef CONFIG_HOTPLUG_CPU
>  #include <asm/nmi.h>
> +
> +#ifdef CONFIG_STR_SMP
> +extern void cpu_exit_clear(int);
> +#endif

Perhaps change that ifdef to denote something which clearly shows that its 
physical hotplug as we'll need this for other users too.

> +#ifdef CONFIG_STR_SMP
> +extern void do_exit_idle(void);
> +extern void cpu_uninit(void);
> +void cpu_exit_clear(int cpu)
> +{
> +	int sibling;
> +	cpucount --;

Is that protected by the cpu_control semaphore?

Thanks,
	Zwane

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