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 <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Dec 12 10:32:42 CET 2017
From: Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Aug 2017 00:28:41 +0530
Subject: powerpc/powernv/idle: Round up latency and residency values
From: Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx>
[ 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.
Reported-by: Anton Blanchard <anton@xxxxxxxxx>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Gautham R. Shenoy <ego@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpuidle/cpuidle-powernv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -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 svaidy@xxxxxxxxxxxxxxxxxx are
queue-4.14/powerpc-powernv-idle-round-up-latency-and-residency-values.patch