linux-kernel - Re: [patch RFC 13/38] PCI: MSI: Rework pci_msi_domain_calc

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Message-ID: <87d03exwf7.fsf@nanos.tec.linutronix.de>
Date:   Tue, 25 Aug 2020 23:11:56 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        linux-pci@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <rja@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Megha Dey <megha.dey@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [patch RFC 13/38] PCI: MSI: Rework pci_msi_domain_calc_hwirq()

On Tue, Aug 25 2020 at 15:03, Bjorn Helgaas wrote:
> On Fri, Aug 21, 2020 at 02:24:37AM +0200, Thomas Gleixner wrote:
>> Retrieve the PCI device from the msi descriptor instead of doing so at the
>> call sites.
>
> I'd like it *better* with "PCI/MSI: " in the subject (to match history

Duh, yes.

> and other patches in this series) and "MSI" here in the commit log,
> but nice cleanup and:
>> --- a/arch/x86/kernel/apic/msi.c
>> +++ b/arch/x86/kernel/apic/msi.c
>> @@ -232,7 +232,7 @@ EXPORT_SYMBOL_GPL(pci_msi_prepare);
>>  
>>  void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
>>  {
>> -	arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
>> +	arg->msi_hwirq = pci_msi_domain_calc_hwirq(desc);
>
> I guess it's safe to assume that "arg->msi_dev ==
> msi_desc_to_pci_dev(desc)"?  I didn't try to verify that.

It is.

>> +irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
>>  {
>> +	struct pci_dev *pdev = msi_desc_to_pci_dev(desc);
>
> If you named this "struct pci_dev *dev" (not "pdev"), the diff would
> be a little smaller and it would match other usage in the file.

Ok. I'm always happy to see pdev because that doesn't make me wonder
which type of dev it is :) But, yeah lets keep it consistent.

Thanks,

        tglx