Add a notifier for _CST changing events. It is necessary to unload
the processor idle handle for a short period of time to avoid for nasty
races -- and we don't want to grab too many locks so that the idle handler
continues to be speedy.
Signed-off-by: Dominik Brodowski <linux@brodo.de>
---
drivers/acpi/processor_core.c | 2 +-
drivers/acpi/processor_idle.c | 27 +++++++++++++++++++++++++++
include/acpi/processor.h | 1 +
3 files changed, 29 insertions(+), 1 deletion(-)
Index: linux-2.6.10-rc3+bk-acpi/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.10-rc3+bk-acpi.orig/drivers/acpi/processor_core.c 2004-12-14 10:02:15.000000000 +0100
+++ linux-2.6.10-rc3+bk-acpi/drivers/acpi/processor_core.c 2004-12-14 13:13:36.285377853 +0100
@@ -627,7 +627,7 @@
pr->performance_platform_limit);
break;
case ACPI_PROCESSOR_NOTIFY_POWER:
- /* TBD */
+ acpi_processor_cst_has_changed(pr);
acpi_bus_generate_event(device, event, 0);
break;
default:
Index: linux-2.6.10-rc3+bk-acpi/drivers/acpi/processor_idle.c
===================================================================
--- linux-2.6.10-rc3+bk-acpi.orig/drivers/acpi/processor_idle.c 2004-12-14 13:12:57.456854168 +0100
+++ linux-2.6.10-rc3+bk-acpi/drivers/acpi/processor_idle.c 2004-12-14 13:13:36.286377712 +0100
@@ -778,6 +778,32 @@
return_VALUE(0);
}
+int acpi_processor_cst_has_changed (struct acpi_processor *pr)
+{
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ if (errata.smp) {
+ return_VALUE(-ENODEV);
+ }
+
+ /* Fall back to the default idle loop */
+ pm_idle = pm_idle_save;
+ pm_idle_save = NULL;
+
+ pr->flags.power = 0;
+ result = acpi_processor_get_power_info(pr);
+ if (pr->flags.power == 1) {
+ pm_idle_save = pm_idle;
+ pm_idle = acpi_processor_idle;
+ }
+
+ return_VALUE(result);
+}
/* proc interface */
@@ -859,3 +885,4 @@
.llseek = seq_lseek,
.release = single_release,
};
+
Index: linux-2.6.10-rc3+bk-acpi/include/acpi/processor.h
===================================================================
--- linux-2.6.10-rc3+bk-acpi.orig/include/acpi/processor.h 2004-12-14 13:12:57.457854027 +0100
+++ linux-2.6.10-rc3+bk-acpi/include/acpi/processor.h 2004-12-14 13:13:36.287377571 +0100
@@ -215,6 +215,7 @@
int acpi_processor_get_power_info (struct acpi_processor *pr);
extern struct file_operations acpi_processor_power_fops;
int no_c2c3(struct dmi_system_id *id);
+int acpi_processor_cst_has_changed (struct acpi_processor *pr);
/* in processor_thermal.c */
int acpi_processor_get_limit_info (struct acpi_processor *pr);