From 56e6b9ee13f15a2713dc3d4e876d826a8df977cd Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 18 Nov 2010 13:54:16 -0800 Subject: [PATCH] .27 patches --- ...ax_cstate-should-not-disable-the-tsc.patch | 39 +++++++++++++++++++ queue-2.6.27/series | 1 + 2 files changed, 40 insertions(+) create mode 100644 queue-2.6.27/acpi-idle-c-states-disabled-by-max_cstate-should-not-disable-the-tsc.patch diff --git a/queue-2.6.27/acpi-idle-c-states-disabled-by-max_cstate-should-not-disable-the-tsc.patch b/queue-2.6.27/acpi-idle-c-states-disabled-by-max_cstate-should-not-disable-the-tsc.patch new file mode 100644 index 00000000000..0307e108b24 --- /dev/null +++ b/queue-2.6.27/acpi-idle-c-states-disabled-by-max_cstate-should-not-disable-the-tsc.patch @@ -0,0 +1,39 @@ +From a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008 Mon Sep 17 00:00:00 2001 +From: Len Brown +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 + +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 +Acked-by: Thomas Gleixner +Cc: Youquan Song +Cc: S.Çağlar Onur +Signed-off-by: Greg Kroah-Hartman + +--- + 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) { diff --git a/queue-2.6.27/series b/queue-2.6.27/series index 16c15b8de53..971fae0c759 100644 --- a/queue-2.6.27/series +++ b/queue-2.6.27/series @@ -3,3 +3,4 @@ sched-fix-string-comparison-in-proc-sched_features.patch libsas-fix-ncq-mixing-with-non-ncq.patch gdth-integer-overflow-in-ioctl.patch fix-race-when-removing-scsi-devices.patch +acpi-idle-c-states-disabled-by-max_cstate-should-not-disable-the-tsc.patch -- 2.47.2