linux-kernel - Re: AW: [PATCH] irqchip/mips-gic: allow forced affinity for current cpu during hotplug

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Message-ID: <878qmkr0u3.ffs@tglx>
Date: Sun, 25 May 2025 20:40:04 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: markus.stockhausen@....de, tsbogend@...ha.franken.de,
 linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
 s.gottschall@...wrt.com
Subject: Re: AW: [PATCH] irqchip/mips-gic: allow forced affinity for current
 cpu during hotplug

On Sun, May 25 2025 at 11:43, markus stockhausen wrote:
>> Von: Thomas Gleixner <tglx@...utronix.de> 
>>
>> On Fri, May 23 2025 at 11:15, Markus Stockhausen wrote:
>> > +
>> > +	if ((cpu >= NR_CPUS) && !force)
>> > +		/* In normal mode allow only online CPUs. */
>> >  		return -EINVAL;
>> >  
>> > +	if (cpu >= NR_CPUS) {
>> > +		/* In force mode allow current not yet online CPU for
> hotplug handlers. */
>> > +		cpu = cpumask_first(cpumask);
>> > +		if (cpu != get_cpu())
>> > +			return -EINVAL;
>> > +	}
>>
>> This logic really makes my brain hurt. Why not doing the obvious:
>>
>>	if (cpu >= NR_CPUS) {
>>         	/* Sensible comment */	
>>         	if (!force)
>>                 	return -EINVAL;
>>                 ...
>>         }
>
> Then what about an even more relaxed and cleaner version like in other
> drivers?
>
> If (force)
>   cpu = cpumask_first(cpumask);
> else
>   cpu = cpumask_first_and(cpumask, cpu_online_mask);

Fine with me.