linux-kernel - Re: [RFC PATCH v3] genirq/affinity: Create and transfer more irq desc info by a new structure

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Date:   Wed, 28 Nov 2018 22:28:20 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
cc:     douliyangs@...il.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        shivasharan.srikanteshwara@...adcom.com,
        Sumit Saxena <sumit.saxena@...adcom.com>, ming.lei@...hat.com,
        Christoph Hellwig <hch@....de>, linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH v3] genirq/affinity: Create and transfer more irq
 desc info by a new structure

On Wed, 28 Nov 2018, Bjorn Helgaas wrote:
> On Wed, Nov 28, 2018 at 10:45 AM Dou Liyang <douliyangs@...il.com> wrote:
> >         if (affd)
> > -               masks = irq_create_affinity_masks(nvec, affd);
> > -
> > +               affi_desc = irq_create_affinity_desc(nvec, affd);
> >
> >         /* MSI Entry Initialization */
> > -       entry = alloc_msi_entry(&dev->dev, nvec, masks);
> > +       entry = alloc_msi_entry(&dev->dev, nvec, affi_desc);
> 
> Can you split this into two or more patches?  Most of these changes
> are trivial and not very interesting, and the fact that they're all in
> one patch makes it hard to find and review the interesting bits.  For
> example,
> 
>   1) Rename all the local variables while keeping the type the same
> (or just leave the name the same; I think "affinity" would be a fine
> name, and I would be OK if we ended up with "struct irq_affinity_desc
> *masks" or "struct irq_affinity_desc *affinity").  This patch would
> obviously have no functional impact and would remove a lot of the
> trivial changes.
> 
>   2) Add "struct irq_affinity_desc" containing only "struct cpumask
> masks" and irq_create_affinity_desc() (or leave the name as
> irq_create_affinity_masks() and adjust the signature).  This would
> also have no functional impact and would be a fairly trivial patch.
> 
>   3) Add "flags" to struct irq_affinity_desc and the related code.
> This is the real meat of your patch, and with the above out of the
> way, it will be much smaller and it'll be obvious what the important
> changes are.

You beat me to it. I was going to ask the same thing. Albeit I'll go over
the conceptual stuff right now as I roughly know what it tries to achieve.

Thanks,

	tglx