linux-kernel - Re: [PATCH v4 1/2] PCI: Add tango MSI controller support

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Message-ID: <20170531200424.GA23171@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 31 May 2017 15:04:24 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Mason <slash.tmp@...e.fr>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Liviu Dudau <liviu.dudau@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Laight <david.laight@...lab.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Robin Murphy <robin.murphy@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>
Subject: Re: [PATCH v4 1/2] PCI: Add tango MSI controller support

On Wed, May 31, 2017 at 09:27:50PM +0200, Mason wrote:
> On 31/05/2017 21:12, Bjorn Helgaas wrote:
> > On Wed, May 31, 2017 at 02:00:37PM -0500, Bjorn Helgaas wrote:
> >> On Wed, May 31, 2017 at 08:49:04PM +0200, Mason wrote:
> >>> On 31/05/2017 19:34, Bjorn Helgaas wrote:
> >>> ...
> >>
> >>>> This would be more an IRQ patch than a PCI patch, but if I were
> >>>> reviewing it, I would look for assurance that *all* the no-op
> >>>> .irq_set_affinity callbacks were cleaned up, not just those in
> >>>> drivers/pci/host.
> >>>
> >>> Are you saying the patch is *wrong* if not all "do-nothing"
> >>> callbacks are cleaned up?
> >>
> >> I'm saying that (1) this probably wouldn't be applied via the PCI
> >> tree, and (2) if it *were* applied via PCI, I would ask that all the
> >> no-op callbacks were cleaned up at the same time.
> >>
> >> Huh, that sounds a lot like what I wrote above.  Was I unclear?
> > 
> > I'm afraid this sounded snarky, which isn't my intention.  It seems
> > like there's a useful patch here, and I didn't want to see it get
> > ignored for lack of following the usual process.  If this is all
> > obvious to you, my apologies and please ignore my suggestion.
> 
> Thanks for clearing things up. I had indeed assumed from
> your first reply that the patch was pointless.
> 
> Writing a script locating all candidates will be an
> interesting exercise.

Cscope only sees 94 definitions of irq_set_affinity.  I know *I* could
never write a script faster than looking at them manually.  While
doing that, I noticed irq_chip_set_affinity_parent(), which is used in
14 cases and appears similar to your patch.