ACPI / processor: Do not request ACPI cpufreq module directly

Function acpi_processor_load_module() used by the ACPI processor
driver can only really work if the acpi-cpufreq module is available
when acpi_processor_start() is executed which usually is not the case
for systems loading the processor driver module from an initramfs.

Moreover, that used to be a hackish workaround for module autoloading
issues, but udev loads acpi-cpufreq just fine nowadays, so that
function isn't really necessary any more.  For this reason, drop
acpi_processor_load_module() entirely.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/processor_driver.c

@@ -171,7 +171,6 @@ static int __acpi_processor_start(struct acpi_device *device)
 
 #ifdef CONFIG_CPU_FREQ
 	acpi_processor_ppc_has_changed(pr, 0);
-	acpi_processor_load_module(pr);
 #endif
 	acpi_processor_get_throttling_info(pr);
 

drivers/acpi/processor_perflib.c

@@ -235,28 +235,6 @@ void acpi_processor_ppc_exit(void)
 	acpi_processor_ppc_status &= ~PPC_REGISTERED;
 }
 
-/*
- * Do a quick check if the systems looks like it should use ACPI
- * cpufreq. We look at a _PCT method being available, but don't
- * do a whole lot of sanity checks.
- */
-void acpi_processor_load_module(struct acpi_processor *pr)
-{
-	static int requested;
-	acpi_status status = 0;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-
-	if (!arch_has_acpi_pdc() || requested)
-		return;
-	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
-	if (!ACPI_FAILURE(status)) {
-		printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
-		request_module_nowait("acpi_cpufreq");
-		requested = 1;
-	}
-	kfree(buffer.pointer);
-}
-
 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 {
 	int result = 0;

include/acpi/processor.h

@@ -225,7 +225,6 @@ struct acpi_processor_errata {
 	} piix4;
 };
 
-extern void acpi_processor_load_module(struct acpi_processor *pr);
 extern int acpi_processor_preregister_performance(struct
 						  acpi_processor_performance
 						  __percpu *performance);