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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>
hifive-unleashed-5.1
Len Brown 2009-05-15 01:29:31 -04:00
parent 520daf7217
commit a0bf284bfe
1 changed files with 1 additions and 1 deletions
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2
drivers/acpi/processor_idle.c
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@ -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) {