1 files changed, 44 insertions, 0 deletions
diff --git a/queue-2.6.32/cpuidle-menu-fixed-wrapping-timers-at-4.294-seconds.patch b/queue-2.6.32/cpuidle-menu-fixed-wrapping-timers-at-4.294-seconds.patch
new file mode 100644
index 0000000..9d08d8b
--- /dev/null
+++ b/queue-2.6.32/cpuidle-menu-fixed-wrapping-timers-at-4.294-seconds.patch
@@ -0,0 +1,44 @@
+From 7467571f4480b273007517b26297c07154c73924 Mon Sep 17 00:00:00 2001
+From: Tero Kristo <tero.kristo@nokia.com>
+Date: Thu, 24 Feb 2011 17:19:23 +0200
+Subject: cpuidle: menu: fixed wrapping timers at 4.294 seconds
+
+From: Tero Kristo <tero.kristo@nokia.com>
+
+commit 7467571f4480b273007517b26297c07154c73924 upstream.
+
+Cpuidle menu governor is using u32 as a temporary datatype for storing
+nanosecond values which wrap around at 4.294 seconds. This causes errors
+in predicted sleep times resulting in higher than should be C state
+selection and increased power consumption. This also breaks cpuidle
+state residency statistics.
+
+Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
+Signed-off-by: Len Brown <len.brown@intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
+
+---
+ drivers/cpuidle/governors/menu.c |    4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/cpuidle/governors/menu.c
++++ b/drivers/cpuidle/governors/menu.c
+@@ -185,6 +185,7 @@ static int menu_select(struct cpuidle_de
+ 	int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY);
+ 	int i;
+ 	int multiplier;
++	struct timespec t;
+ 
+ 	if (data->needs_update) {
+ 		menu_update(dev);
+@@ -199,8 +200,9 @@ static int menu_select(struct cpuidle_de
+ 		return 0;
+ 
+ 	/* determine the expected residency time, round up */
++	t = ktime_to_timespec(tick_nohz_get_sleep_length());
+ 	data->expected_us =
+-	    DIV_ROUND_UP((u32)ktime_to_ns(tick_nohz_get_sleep_length()), 1000);
++		t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC;
+ 
+ 
+ 	data->bucket = which_bucket(data->expected_us);