Patch "powerpc/powernv/idle: Round up latency and residency values" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

powerpc/powernv/idle: Round up latency and residency values

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
powerpc-powernv-idle-round-up-latency-and-residency-values.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Vaidyanathan Srinivasan <[email protected]>
Date: Thu, 24 Aug 2017 00:28:41 +0530
Subject: powerpc/powernv/idle: Round up latency and residency values

From: Vaidyanathan Srinivasan <[email protected]>

[ Upstream commit 8d4e10e9ed9450e18fbbf6a8872be0eac9fd4999 ]

On PowerNV platforms, firmware provides exit latency and target residency for each of the idle states in nano seconds. Cpuidle framework expects the values in micro seconds. Round up to nearest micro seconds to avoid errors in cases where the values are defined as fractional micro seconds.

Default idle state of 'snooze' has exit latency of zero. If other states have fractional micro second exit latency, they would get rounded down to zero micro second and make cpuidle framework choose deeper idle state when snooze loop is the right choice.

---
 drivers/cpuidle/cpuidle-powernv.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -384,9 +384,9 @@ static int powernv_add_idle_states(void)
 		 * Firmware passes residency and latency values in ns.
 		 * cpuidle expects it in us.
 		 */
-		exit_latency = latency_ns[i] / 1000;
+		exit_latency = DIV_ROUND_UP(latency_ns[i], 1000);
 		if (!rc)
-			target_residency = residency_ns[i] / 1000;
+			target_residency = DIV_ROUND_UP(residency_ns[i], 1000);
 		else
 			target_residency = 0;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/powerpc-powernv-idle-round-up-latency-and-residency-values.patch