2.6.25 regression: powertop says 120K wakeups/sec

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 788da9781f80..836362b50faa 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -848,6 +848,7 @@ static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
                 /* 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_cst(struct acpi_processor *pr)
                                  cx.address);
                 }
 
+                if (cx.type == ACPI_STATE_C1) {
+                        cx.valid = 1;
+                }
 
                 obj = &(element->package.elements[2]);
                 if (obj->type != ACPI_TYPE_INTEGER)