linux-kernel - Re: [PATCH 3/4] cpu/hotplug: Add cpuhp_invoke_callback

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Message-ID: <YAgr8RQg6Cn66bvf@hirez.programming.kicks-ass.net>
Date:   Wed, 20 Jan 2021 14:11:13 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     vincent.donnefort@....com
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        valentin.schneider@....com
Subject: Re: [PATCH 3/4] cpu/hotplug: Add cpuhp_invoke_callback_range()

On Mon, Jan 11, 2021 at 05:10:46PM +0000, vincent.donnefort@....com wrote:
> @@ -157,26 +162,24 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state,
>  
>  	if (st->fail == state) {
>  		st->fail = CPUHP_INVALID;
> -
> -		if (!(bringup ? step->startup.single : step->teardown.single))
> -			return 0;
> -
>  		return -EAGAIN;
>  	}
>  
> +	if (cpuhp_step_empty(bringup, step)) {
> +		WARN_ON_ONCE(1);
> +		return 0;
> +	}

This changes the behaviour of fail.. might be best to refactor without
changing behaviour.

Lemme continue reading.