linux-kernel - Re: [PATCH v4 pci 0/2] PCI/MSI: pci-xgene-msi: Enable MSI support in ACPI boot for X-Gene v1

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Date:   Wed, 18 Oct 2017 10:26:39 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Khuong Dinh <kdinh@....com>
Cc:     Marc Zyngier <marc.zyngier@....com>, msalter@...hat.com,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        jcm@...hat.com, patches <patches@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        rjw@...ysocki.net
Subject: Re: [PATCH v4 pci 0/2] PCI/MSI: pci-xgene-msi: Enable MSI support in
 ACPI boot for X-Gene v1

[removed unintended disclaimer]

On Tue, Oct 17, 2017 at 10:45:35PM -0700, Khuong Dinh wrote:
> Hi Lorenzo,
> 
> On Tue, Oct 17, 2017 at 6:38 AM, Lorenzo Pieralisi
> <lorenzo.pieralisi@....com> wrote:
> > Hi Khuong,
> >
> > On Mon, Oct 16, 2017 at 02:19:50PM -0700, Khuong Dinh wrote:
> >> Hi Lorenzo,
> >>   Do you have any comments for this patch?
> >
> > I'd have some comments but given that there are related issues with ACPI
> > probe ordering that Marc is trying to solve on his side - I will work
> > with him to see if we can accommodate changes that can solve this issue
> > too.
> >
> > Again - I recognize it is a complex problem (that is not even
> > contemplated by the current ACPI specs), we have to try to make
> > the solution as generic as we can to prevent reinventing the wheel
> > anytime a sligthly different issue (related to ACPI probe ordering)
> > comes up.
> >
> > Leave it to me (us) and I will get back to you on this.
> 
> Thanks for helping to take care of the generic ACPI probe ordering issue.
> Given that the patch 'PCI/MSI: pci-xgene-msi: Enable MSI support in ACPI
> boot for X-Gene v1" adds only the ACPI ID, can you pull in this patch
> independently from the ACPI probe ordering issue?

No. For two reasons:

1) It's Bjorn who decides whether that code can be merged or not, not me
2) That patch sneaks in ACPI MSI support for X-gene v1 that depends on
   kernel link ordering. As soon as it is pulled in the mainline it
   creates a dependency on pseudo-working code that may break anytime
   and as I said many times before I am not willing to rely on that.

Lorenzo