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ACPI: processor: Do not expose global variable acpi_idle_driver 

Move the cpuidle driver check from __acpi_processor_start() to
acpi_processor_power_init() which allows variable acpi_idle_driver to
become static.

No intentional functional impact.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Tested-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20251223100914.2407069-7-lihuisong@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Huisong Li 2025-12-23 18:09:14 +08:00 committed by Rafael J. Wysocki
parent d8e43c89cf
commit 24b09e8491
3 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/acpi/processor_driver.c
View File

@ -166,8 +166,7 @@ static int __acpi_processor_start(struct acpi_device *device)
if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
dev_dbg(&device->dev, "CPPC data invalid or not present\n");
if (cpuidle_get_driver() == &acpi_idle_driver)
acpi_processor_power_init(pr);
acpi_processor_power_init(pr);
acpi_pss_perf_init(pr);

9
drivers/acpi/processor_idle.c
View File

@ -51,7 +51,7 @@ module_param(latency_factor, uint, 0644);
static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);
struct cpuidle_driver acpi_idle_driver = {
static struct cpuidle_driver acpi_idle_driver = {
.name = "acpi_idle",
.owner = THIS_MODULE,
};
@ -1395,6 +1395,13 @@ void acpi_processor_power_init(struct acpi_processor *pr)
{
struct cpuidle_device *dev;
/*
* The code below only works if the current cpuidle driver is the ACPI
* idle driver.
*/
if (cpuidle_get_driver() != &acpi_idle_driver)
return;
if (disabled_by_idle_boot_param())
return;

1
include/acpi/processor.h
View File

@ -417,7 +417,6 @@ static inline void acpi_processor_throttling_init(void) {}
#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
/* in processor_idle.c */
extern struct cpuidle_driver acpi_idle_driver;
#ifdef CONFIG_ACPI_PROCESSOR_IDLE
void acpi_processor_power_init(struct acpi_processor *pr);
void acpi_processor_power_exit(struct acpi_processor *pr);