From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:41798 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750731AbdLLKNH (ORCPT ); Tue, 12 Dec 2017 05:13:07 -0500 Subject: Patch "powerpc/powernv/idle: Round up latency and residency values" has been added to the 4.14-stable tree To: svaidy@linux.vnet.ibm.com, alexander.levin@verizon.com, anton@samba.org, ego@linux.vnet.ibm.com, gregkh@linuxfoundation.org, mpe@ellerman.id.au Cc: , From: Date: Tue, 12 Dec 2017 11:11:34 +0100 Message-ID: <151307349457105@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 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 know about it. >>From foo@baz Tue Dec 12 10:32:42 CET 2017 From: Vaidyanathan Srinivasan Date: Thu, 24 Aug 2017 00:28:41 +0530 Subject: powerpc/powernv/idle: Round up latency and residency values From: Vaidyanathan Srinivasan [ 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 Signed-off-by: Vaidyanathan Srinivasan Reviewed-by: Gautham R. Shenoy Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- 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@linux.vnet.ibm.com are queue-4.14/powerpc-powernv-idle-round-up-latency-and-residency-values.patch