linux-kernel - [PATCH v1] ACPI: processor: idle: Add module import namespace

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Message-ID: <3376499.aeNJFYEL58@rafael.j.wysocki>
Date: Wed, 13 Aug 2025 12:36:04 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: Linux PM <linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 Sudeep Holla <sudeep.holla@....com>,
 Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: [PATCH v1] ACPI: processor: idle: Add module import namespace

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Add a new module import namespace called ACPI_PROCESSOR_IDLE for
functions exported from the non-modular part of the ACPI processor
driver to the modular part of it.

Export acpi_processor_claim_cst_control() and acpi_processor_evaluate_cst()
in that namespace to hide them from unrelated modules.

They are also used by the intel_idle driver, but it is non-modular,
so it can call them regardless of the way the symbols are exported.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/acpi_processor.c |    4 ++--
 drivers/acpi/processor_idle.c |    2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -815,7 +815,7 @@
 	cst_control_claimed = true;
 	return true;
 }
-EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control);
+EXPORT_SYMBOL_NS_GPL(acpi_processor_claim_cst_control, "ACPI_PROCESSOR_IDLE");

 /**
  * acpi_processor_evaluate_cst - Evaluate the processor _CST control method.
@@ -994,5 +994,5 @@

 	return ret;
 }
-EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst);
+EXPORT_SYMBOL_NS_GPL(acpi_processor_evaluate_cst, "ACPI_PROCESSOR_IDLE");
 #endif /* CONFIG_ACPI_PROCESSOR_CSTATE */
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1431,3 +1431,5 @@
 	pr->flags.power_setup_done = 0;
 	return 0;
 }
+
+MODULE_IMPORT_NS("ACPI_PROCESSOR_IDLE");