+++ /dev/null
-From a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008 Mon Sep 17 00:00:00 2001
-From: Len Brown <len.brown@intel.com>
-Date: Fri, 15 May 2009 01:29:31 -0400
-Subject: ACPI: Idle C-states disabled by max_cstate should not disable the TSC
-
-From: Len Brown <len.brown@intel.com>
-
-commit a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008 upstream.
-
-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>
-Cc: Youquan Song <youquan.song@linux.intel.com>
-Cc: S.Çağlar Onur <caglar@CS.Princeton.EDU>
-Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-
----
- drivers/acpi/processor_idle.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/drivers/acpi/processor_idle.c
-+++ b/drivers/acpi/processor_idle.c
-@@ -1158,7 +1158,7 @@ static int acpi_processor_power_verify(s
-
- 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) {