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| author | Len Brown <len.brown@intel.com> | 2009-05-15 01:29:31 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-05-16 01:52:39 -0400 |
| commit | a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008 (patch) | |
| tree | 2cad50754a5af8ac5dd03fae5977bcf0ec88dd1c /drivers/acpi/processor_idle.c | |
| parent | 520daf7217bc1806c02eb4cfa7805447a3da2f66 (diff) | |
| download | blackbird-op-linux-a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008.tar.gz blackbird-op-linux-a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008.zip | |
ACPI: Idle C-states disabled by max_cstate should not disable the TSC
Processor idle power states C2 and C3 stop the TSC on many machines.
Linux recognizes this situation and marks the TSC as unstable:
Marking TSC unstable due to TSC halts in idle
But if those same machines are booted with "processor.max_cstate=1",
then there is no need to validate C2 and C3, and no need to
disable the TSC, which can be reliably used as a clocksource.
Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/acpi/processor_idle.c')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index e39a40a2ceae..e65476fdf40d 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -582,7 +582,7 @@ static int acpi_processor_power_verify(struct acpi_processor *pr) pr->power.timer_broadcast_on_state = INT_MAX; - for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { + for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { struct acpi_processor_cx *cx = &pr->power.states[i]; switch (cx->type) { |
