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Subject[patch 01/16] 2.6.25 regression: powertop says 120K wakeups/sec
2.6.25-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

commit 0fda6b403f0eca66ad8a7c946b3996e359100443 upstream

Patch to fix huge number of wakeups reported due to recent changes in
processor_idle.c. The problem was that the entry_method determination was
broken due to one of the recent commits (bc71bec91f987) causing
C1 entry to not to go to halt.

http://lkml.org/lkml/2008/3/22/124

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/acpi/processor_idle.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -848,6 +848,7 @@ static int acpi_processor_get_power_info
/* all processors need to support C1 */
pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
pr->power.states[ACPI_STATE_C1].valid = 1;
+ pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
}
/* the C0 state only exists as a filler in our array */
pr->power.states[ACPI_STATE_C0].valid = 1;
@@ -960,6 +961,9 @@ static int acpi_processor_get_power_info
cx.address);
}

+ if (cx.type == ACPI_STATE_C1) {
+ cx.valid = 1;
+ }

obj = &(element->package.elements[2]);
if (obj->type != ACPI_TYPE_INTEGER)
--


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