linux-kernel - Re: [PATCH 5/8] genirq/affinity: update CPU affinity for CPU hotplug events

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Date:   Fri, 16 Jun 2017 12:29:59 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Christoph Hellwig <hch@....de>
cc:     Jens Axboe <axboe@...nel.dk>, Keith Busch <keith.busch@...el.com>,
        linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] genirq/affinity: update CPU affinity for CPU hotplug
 events

On Sat, 3 Jun 2017, Christoph Hellwig wrote:
> +static void irq_affinity_online_irq(unsigned int irq, struct irq_desc *desc,
> +				    unsigned int cpu)
> +{
> +	const struct cpumask *affinity;
> +	struct irq_data *data;
> +	struct irq_chip *chip;
> +	unsigned long flags;
> +	cpumask_var_t mask;
> +
> +	if (!desc)
> +		return;
> +	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
> +		return;

That's silly. Why want you to do that for each irq descriptor? That's
outright silly. Either you allocated it in irq_affinity_[on|off]line_cpu()
once or just make it a static cpumask. Lemme fix that up.

Thanks,

	tglx