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

cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: cpufreq-powernv-dont-assume-distinct-pstate-values-for-nominal-and-pmin.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 3fa4680b860bf48b437d6a2c039789c4abe202ae Mon Sep 17 00:00:00 2001

From: Shilpasri G Bhat shilpa.bhat@linux.vnet.ibm.com Date: Fri, 12 Jan 2018 12:43:53 +0530 Subject: cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

From: Shilpasri G Bhat shilpa.bhat@linux.vnet.ibm.com

commit 3fa4680b860bf48b437d6a2c039789c4abe202ae upstream.

Some OpenPOWER boxes can have same pstate values for nominal and pmin pstates. In these boxes the current code will not initialize 'powernv_pstate_info.min' variable and result in erroneous CPU frequency reporting. This patch fixes this problem.

Fixes: 09ca4c9b5958 (cpufreq: powernv: Replacing pstate_id with frequency table index) Reported-by: Alvin Wang wangat@tw.ibm.com Signed-off-by: Shilpasri G Bhat shilpa.bhat@linux.vnet.ibm.com Acked-by: Viresh Kumar viresh.kumar@linaro.org Cc: 4.8+ stable@vger.kernel.org # 4.8+ Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

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

--- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -260,9 +260,9 @@ static int init_powernv_pstates(void)

if (id == pstate_max) powernv_pstate_info.max = i; - else if (id == pstate_nominal) + if (id == pstate_nominal) powernv_pstate_info.nominal = i; - else if (id == pstate_min) + if (id == pstate_min) powernv_pstate_info.min = i; }

Patches currently in stable-queue which might be from shilpa.bhat@linux.vnet.ibm.com are

queue-4.9/cpufreq-powernv-dont-assume-distinct-pstate-values-for-nominal-and-pmin.patch