** Also affects: linux (Ubuntu Vivid)
Importance: Undecided
Status: New
** No longer affects: linux (Ubuntu Vivid)
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https://bugs.launchpad.net/bugs/1451825
Title:
Add cpuidle-powernv upstream bug fixes and upstream patch to fix
kernel regression due to cpuidle on to 14.04.03 kernel
Status in linux package in Ubuntu:
New
Bug description:
This is a feature request to include the following patches in 14.04.03
kernel.
[1] 74aa51b5ccd39753 cpuidle: powernv: Populate cpuidle state details by
querying the device-tree
(3.18 upstream)
[2] cpuidle/powernv: Read target_residency value of idle states from DT if
available
https://lkml.org/lkml/2015/2/3/23
[3] tick/broadcast-hrtimer : Fix suspicious RCU usage in idle loop
http://linuxppc.10917.n7.nabble.com/PATCH-tick-broadcast-hrtimer-Fix-suspicious-RCU-usage-in-idle-loop-td89675.html
[1] and [2] patches provide fixes to read the latency and
target_residency values of different idle states from the device tree
if they are present in the device tree. This fix will avoid cpu from
aggressively entering into fastsleep.
[3] is an important fix against a kernel regression down the cpuidle
path which was reported in the community.
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