Commit 43bab25c authored by Alex Chiang's avatar Alex Chiang Committed by Len Brown
Browse files

ACPI: processor: change acpi_processor_set_pdc() interface 



When calling _PDC, we really only need the handle to the processor
to call the method; we don't look at any other parts of the
struct acpi_processor * given to us.

In the early path, when we walk the namespace, we are given the
handle directly, so just pass it through to acpi_processor_set_pdc()
without stuffing it into a wasteful struct acpi_processor allocated
on the stack each time

This saves 2834 bytes of stack.

Update the interface accordingly.

Signed-off-by: default avatarAlex Chiang <achiang@hp.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent b9c2db78

drivers/acpi/processor_core.c

+1 −1
Original line number Diff line number Diff line
@@ -763,7 +763,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device) 
	}



	/* _PDC call should be done before doing anything else (if reqd.). */

	acpi_processor_set_pdc(pr);

	acpi_processor_set_pdc(pr->handle);



#ifdef CONFIG_CPU_FREQ

	acpi_processor_ppc_has_changed(pr, 0);

drivers/acpi/processor_pdc.c

+3 −15
Original line number Diff line number Diff line
@@ -125,7 +125,7 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) 
	return status;

}



void acpi_processor_set_pdc(struct acpi_processor *pr)

void acpi_processor_set_pdc(acpi_handle handle)

{

	struct acpi_object_list *obj_list;
@@ -136,7 +136,7 @@ void acpi_processor_set_pdc(struct acpi_processor *pr) 
	if (!obj_list)

		return;



	acpi_processor_eval_pdc(pr->handle, obj_list);

	acpi_processor_eval_pdc(handle, obj_list);



	kfree(obj_list->pointer->buffer.pointer);

	kfree(obj_list->pointer);
@@ -147,19 +147,7 @@ EXPORT_SYMBOL_GPL(acpi_processor_set_pdc); 
static acpi_status

early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)

{

	struct acpi_processor pr;



	pr.handle = handle;



	/* x86 implementation looks at pr.id to determine some

	 * CPU capabilites. We can just hard code to 0 since we're

	 * assuming the CPUs in the system are homogenous and all

	 * have the same capabilities.

	 */

	pr.id = 0;



	acpi_processor_set_pdc(&pr);



	acpi_processor_set_pdc(handle);

	return AE_OK;

}

include/acpi/processor.h

+1 −1
Original line number Diff line number Diff line
@@ -323,7 +323,7 @@ static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) 
#endif				/* CONFIG_CPU_FREQ */



/* in processor_pdc.c */

void acpi_processor_set_pdc(struct acpi_processor *pr);

void acpi_processor_set_pdc(acpi_handle handle);



/* in processor_throttling.c */

int acpi_processor_tstate_has_changed(struct acpi_processor *pr);

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