linux-kernel - Re: [PATCH v5 01/10] x86/acpi: Add a helper functions to setup and access the wakeup mailbox

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Message-ID: <20250630225144.GC3072@ranerica-svr.sc.intel.com>
Date: Mon, 30 Jun 2025 15:51:44 -0700
From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: 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" <kirill.shutemov@...ux.intel.com>,
	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>
Subject: Re: [PATCH v5 01/10] x86/acpi: Add a helper functions to setup and
 access the wakeup mailbox

On Mon, Jun 30, 2025 at 08:55:25PM +0200, Rafael J. Wysocki wrote:
> s/a helper/helper/ in the subject.

Ugh! I missed this since v3. I corrected it. Thanks for noticing.

> 
> On Sat, Jun 28, 2025 at 5:35 AM Ricardo Neri
> <ricardo.neri-calderon@...ux.intel.com> wrote:
> >
> > In preparation to move the functionality to wake secondary CPUs up out of
> > 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.
> >
> > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> 
> With the above nit addressed
> 
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Thank you!