linux-kernel - Re: [PATCH v6 01/10] x86/acpi: Add helper functions to setup and access the wakeup mailbox

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Message-ID: <CAJZ5v0j9AnWNzrkpf25Cri0FEcimMs6W=DDjwJ=mBBpZ1zPNyA@mail.gmail.com>
Date: Sat, 18 Oct 2025 15:08:23 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, x86@...nel.org, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Rob Herring <robh@...nel.org>, 
	"K. Y. Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
	Dexuan Cui <decui@...rosoft.com>, Michael Kelley <mhklinux@...look.com>, 
	Saurabh Sengar <ssengar@...ux.microsoft.com>, Chris Oo <cho@...rosoft.com>, 
	"Kirill A. Shutemov" <kas@...nel.org>, linux-hyperv@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Ricardo Neri <ricardo.neri@...el.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v6 01/10] x86/acpi: Add helper functions to setup and
 access the wakeup mailbox

On Sat, Oct 18, 2025 at 4:48 AM Ricardo Neri
<ricardo.neri-calderon@...ux.intel.com> wrote:
>
> On Fri, Oct 17, 2025 at 11:46:59AM +0200, Rafael J. Wysocki wrote:
> > On Fri, Oct 17, 2025 at 4:48 AM Ricardo Neri
> > <ricardo.neri-calderon@...ux.intel.com> wrote:
> > >
> > > In preparation to move the functionality to wake secondary CPUs up from the
> > > ACPI code, add two helper functions.
> > >
> > > The function acpi_setup_mp_wakeup_mailbox() stores the physical address of
> > > the mailbox and updates the wakeup_secondary_cpu_64() APIC callback.
> > >
> > > There is a slight change in behavior: now the APIC callback is updated
> > > before configuring CPU hotplug offline behavior. This is fine as the APIC
> > > callback continues to be updated unconditionally, regardless of the
> > > restriction on CPU offlining.
> > >
> > > The function acpi_madt_multiproc_wakeup_mailbox() returns a pointer to the
> > > mailbox. Use this helper function only in the portions of the code for
> > > which the variable acpi_mp_wake_mailbox will be out of scope once it is
> > > relocated out of the ACPI directory.
> > >
> > > The wakeup mailbox is only supported for CONFIG_X86_64 and needed only with
> > > CONFIG_SMP=y.
> > >
> > > Reviewed-by: Dexuan Cui <decui@...rosoft.com>
> > > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > This should have been
> >
> > Acked-by: Rafael J. Wysocki (Intel) <rafael.j.wysocki@...el.com>
> >
> > The "(Intel)" part is missing and I omitted it when I sent the tag.
> > Sorry for the confusion.
>
> Thanks for the clarification Rafael. Does this clarification apply also
> patches 2 and 3?

Yes, it does.

> Also, if no further changes are needed in the series, can it be corrected
> when the patches are merged?

I think so.