linux-kernel - Re: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device

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Date:   Mon, 12 Sep 2016 15:25:38 -0600
From:   Jon Derrick <jonathan.derrick@...el.com>
To:     Rui Wang <rui.y.wang@...el.com>
Cc:     bhelgaas@...gle.com, tglx@...utronix.de, rjw@...ysocki.net,
        mingo@...nel.org, bp@...en8.de, torvalds@...ux-foundation.org,
        peterz@...radead.org, helgaas@...nel.org,
        linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
        tony.luck@...el.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI
 device

On Sat, Sep 10, 2016 at 11:40:45PM +0800, Rui Wang wrote:
> Some PCI root bridges don't have a corresponding ACPI device.
> This can be the case on some old platforms. Don't call acpi_ioapic_add()
> on these bridges because they can't support ioapic hotplug.
Not just old platforms. VMD is a new device which initializes a root port in software without an acpi handle.

What branch is this based on? I can't find the relevant code/commits