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

[Jon Derrick]

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