Re: [PATCH v4] cpu/hotplug: Do not bail-out in DYING/STARTING sections

[Valentin Schneider <vschneid@redhat.com>]

On 04/07/22 14:13, 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)
[...]
> +		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;

On a single failure we'll get two warns (WARN_ON_ONCE() + pr_warn(), and
then subsequently just the pr_warn()), is that intended?

Also, why not have ret = err here?

> +		} else {
> +			ret = err;
>                       break;
> +		}
>       }
>
> -	return err;
> +	return ret;

> +static inline void cpuhp_invoke_callback_range_nofail(bool bringup,
> +						      unsigned int cpu,
> +						      struct cpuhp_cpu_state *st,
> +						      enum cpuhp_state target)
> +{
> +	WARN_ON_ONCE(_cpuhp_invoke_callback_range(bringup, cpu, st, target, true));
>  }
>