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[Bug 1442878] Re: Backport upstream bugfix in cpuidle to fix memory corruption

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sun, 12 Apr 2015 14:06:50 -0000
Reply-to: Bug 1442878 <1442878@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

** Tags added: cherry-pick

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https://bugs.launchpad.net/bugs/1442878

Title:
  Backport upstream bugfix in cpuidle to fix memory corruption

Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - Shilpasri G. Bhat <shigbhat@xxxxxxxxxx> - 2015-04-10 14:35:43 ==
  This is a request to backport upstream cpuidle bugfix for a memory corruption

  d52356e7f48e  powerpc: fix memory corruption by pnv_alloc_idle_core_states
      
  Space allocated for paca is based off nr_cpu_ids, but pnv_alloc_idle_core_states()
  iterates paca with cpu_nr_cores()*threads_per_core, which is using NR_CPUS. 
  This causes pnv_alloc_idle_core_states() to write over memory, which is outside 
  of paca array and may later lead to various panics.

  Fixes: 7cba160ad789 (powernv/cpuidle: Redesign idle states management)

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