linux-kernel - Re: [PATCH V2 1/4] genirq/affinity: store irq set vectors in 'struct irq

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Date:   Tue, 12 Feb 2019 14:35:29 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ming Lei <ming.lei@...hat.com>
cc:     Christoph Hellwig <hch@....de>, Bjorn Helgaas <helgaas@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, Keith Busch <keith.busch@...el.com>
Subject: Re: [PATCH V2 1/4] genirq/affinity: store irq set vectors in 'struct
 irq_affinity'

On Tue, 12 Feb 2019, Ming Lei wrote:

> Currently the array of irq set vectors is provided by driver.
> 
> irq_create_affinity_masks() can be simplied a bit by treating the
> non-irq-set case as single irq set.
> 
> So move this array into 'struct irq_affinity', and pre-define the max
> set number as 4, which should be enough for normal cases.

You really want to add some sanity check which makes sure, that nr_sets is
<= IRQ_MAX_SETS.

Thanks,

	tglx