linux-kernel - [PATCH v5 02/18] ACPI: processor: Set the ACPI

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Date: Fri, 12 Apr 2024 15:37:03 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: <linux-pm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
	<linux-acpi@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<kvmarm@...ts.linux.dev>, <x86@...nel.org>, Russell King
	<linux@...linux.org.uk>, "Rafael J . Wysocki" <rafael@...nel.org>, Miguel
 Luis <miguel.luis@...cle.com>, James Morse <james.morse@....com>, Salil Mehta
	<salil.mehta@...wei.com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
CC: <linuxarm@...wei.com>, <justin.he@....com>, <jianyong.wu@....com>
Subject: [PATCH v5 02/18] ACPI: processor: Set the ACPI_COMPANION for the struct cpu instance

The arm64 specific arch_register_cpu() needs to access the _STA
method of the DSDT object so make it available by assigning the
appropriate handle to the struct cpu instance.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/acpi/acpi_processor.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 7a0dd35d62c9..93e029403d05 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -235,6 +235,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
 	union acpi_object object = { 0 };
 	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 	struct acpi_processor *pr = acpi_driver_data(device);
+	struct cpu *c;
 	int device_declaration = 0;
 	acpi_status status = AE_OK;
 	static int cpu0_initialized;
@@ -314,6 +315,8 @@ static int acpi_processor_get_info(struct acpi_device *device)
 			cpufreq_add_device("acpi-cpufreq");
 	}
 
+	c = &per_cpu(cpu_devices, pr->id);
+	ACPI_COMPANION_SET(&c->dev, device);
 	/*
 	 *  Extra Processor objects may be enumerated on MP systems with
 	 *  less than the max # of CPUs. They should be ignored _iff
-- 
2.39.2