Re: [tip:smp/hotplug] cpu/hotplug: Convert to a state machine for the control processor

[Peter Zijlstra]

On Tue, Mar 01, 2016 at 11:53:25AM -0800, tip-bot for Thomas Gleixner wrote:
> @@ -558,22 +648,22 @@ static int _cpu_up(unsigned int cpu, int tasks_frozen)
>  
>  	cpuhp_tasks_frozen = tasks_frozen;
>  
> +	prev_state = st->state;
> +	st->target = CPUHP_ONLINE;
> +	while (st->state < st->target) {
> +		struct cpuhp_step *step;
> +
> +		st->state++;
> +		step = cpuhp_bp_states + st->state;
> +		ret = cpuhp_invoke_callback(cpu, st->state, step->startup);
> +		if (ret) {
> +			st->target = prev_state;
> +			undo_cpu_up(cpu, st);
> +			break;
> +		}
> +	}

All your other state loops use for().