linux-kernel - Re: [PATCH v2] cpu/hotplug: Do not bail-out in DYING/STARTING sections

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Date:   Mon, 13 Jun 2022 14:36:18 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Vincent Donnefort <vdonnefort@...gle.com>, peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, vschneid@...hat.com,
        kernel-team@...roid.com, Vincent Donnefort <vdonnefort@...gle.com>,
        Derek Dolney <z23@...teo.net>
Subject: Re: [PATCH v2] cpu/hotplug: Do not bail-out in DYING/STARTING sections

Vincent,

On Mon, May 23 2022 at 17:05, Vincent Donnefort wrote:
> +static int _cpuhp_invoke_callback_range(bool bringup,
> +					unsigned int cpu,
> +					struct cpuhp_cpu_state *st,
> +					enum cpuhp_state target,
> +					bool nofail)
>  {
>  	enum cpuhp_state state;
> -	int err = 0;
> +	int ret = 0;
>  
>  	while (cpuhp_next_state(bringup, &state, st, target)) {
> +		int err;
> +
>  		err = cpuhp_invoke_callback(cpu, state, bringup, NULL, NULL);
> -		if (err)
> +		if (!err)
> +			continue;
> +
> +		if (nofail) {
> +			pr_warn("CPU %u %s state %s (%d) failed (%d)\n",
> +				cpu, bringup ? "UP" : "DOWN",
> +				cpuhp_get_step(st->state)->name,
> +				st->state, err);
> +			ret = -1;

I have a hard time to map this to the changelog:

> those sections. In that case, there's nothing the hotplug machinery can do,
> so let's just proceed and log the failures.

That's still returning an error code at the end. Confused.

Thanks,

        tglx