linux-kernel - RE: [EXTERNAL] [PATCH v5 02/10] x86/acpi: Move acpi_wakeup

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Message-ID:
 <DS3PR21MB587843A19E47111E543BD561BF08A@DS3PR21MB5878.namprd21.prod.outlook.com>
Date: Fri, 12 Sep 2025 16:49:17 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Rob Herring <robh@...nel.org>, KY Srinivasan
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu
	<wei.liu@...nel.org>, Michael Kelley <mhklinux@...look.com>, "Rafael J.
 Wysocki" <rafael@...nel.org>
CC: "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>, Chris Oo
	<cho@...rosoft.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Ricardo Neri
	<ricardo.neri@...el.com>, Yunhong Jiang <yunhong.jiang@...ux.intel.com>
Subject: RE: [EXTERNAL] [PATCH v5 02/10] x86/acpi: Move acpi_wakeup_cpu() and
 helpers to smpwakeup.c

> From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> Sent: Friday, June 27, 2025 8:35 PM
>  [...]
> The bootstrap processor uses acpi_wakeup_cpu() to indicate to firmware that
> it wants to boot a secondary CPU using a mailbox as described in the
> Multiprocessor Wakeup Structure of the ACPI specification.
> 
> The platform firmware may implement the mailbox as described in the ACPI
> specification but enumerate it using a DeviceTree graph. An example of
> this is OpenHCL paravisor.
> 
> Move the code used to setup and use the mailbox for CPU wakeup out of the
> ACPI directory into a new smpwakeup.c file that both ACPI and DeviceTree
> can use.
> 
> No functional changes are intended.
> 
> Co-developed-by: Yunhong Jiang <yunhong.jiang@...ux.intel.com>
> Signed-off-by: Yunhong Jiang <yunhong.jiang@...ux.intel.com>
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> ---

LGTM

Reviewed-by: Dexuan Cui <decui@...rosoft.com>