** Changed in: ubuntu-power-systems
Status: Incomplete => Fix Committed
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https://bugs.launchpad.net/bugs/1746174
Title:
Error in CPU frequency reporting when nominal and min pstates are same
(cpufreq)
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Artful:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Bug description:
== SRU Justification ==
Commit 09ca4c9b5958 introduced a bug in v4.8-rc2. The bug is that
an error happens in CPU frequency reporting when nominal and min pstates
are the same (cpufreq). Commit 3fa4680b8 fixes this issue.
Commit 3fa4680b8 is in mailine as of v4.16-rc1 and has been cc'd to
upstream stable.
== Fix ==
commit 3fa4680b860bf48b437d6a2c039789c4abe202ae
Author: Shilpasri G Bhat <[email protected]>
Date: Fri Jan 12 12:43:53 2018 +0530
cpufreq: powernv: Dont assume distinct pstate values for nominal
and pmin
== Regression Potential ==
Low. This commit been cc'd to upstream stable, so it has had additional
upstream review.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
== Comment: #0 - Shilpasri G. Bhat
+++ This bug was initially created as a clone of Bug #163527 +++
---Problem Description---
Error in CPU frequency reporting when nominal and min pstates are same
The patch for this issue is accepted to linux-next as
3fa4680b860bf48b437d6a2c039789c4abe202ae
cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin
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 <[email protected]>
Signed-off-by: Shilpasri G Bhat <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Cc: 4.8+ <[email protected]> # 4.8+
Signed-off-by: Rafael J. Wysocki <[email protected]>
https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-
pm.git/commit/drivers/cpufreq/powernv-cpufreq.c?h=linux-
next&id=3fa4680b860bf48b437d6a2c039789c4abe202ae
break-fix: - cf0de9a0d52ff64bcb6b20b6fa4b5d3eb4637719
break-fix: - 3fa4680b860bf48b437d6a2c039789c4abe202ae
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