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[Chris J Arges <1380432@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1380432

Title:
  24x7 counters: Bug in catalog_read()

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Invalid
Status in “linux” source package in Utopic:
  Fix Committed
Status in “linux” source package in Vivid:
  Fix Released

Bug description:
  SRU Justification:

  [Impact]
  When using POWER8 in HV mode one cannot access 
  /sys/bus/event_source/devices/hv_24x7/interface/catalog

  [Test Case]
  cp /sys/bus/event_source/devices/hv_24x7/interface/catalog /tmp
  ls -l /tmp/catalog
  # this should show a file with a size > 0

  [Fix]
  56f12bee55d740dc47eed0ca9d5c72cffdffd6cf which is in 3.18-rc1
  It is a clean cherry pick into 3.16/3.13.

  --

  
  ---Problem Description---
  24x7 counters: Bug in catalog_read()

  ---Additional Hardware Info---
  Power8 system with support for 24x7 counters

   Machine Type = Power8 IBM,9119-MME

  ---Steps to Reproduce---
  cp /sys/bus/event_source/devices/hv_24x7/interface/catalog /tmp
  ls -l /tmp/catalog

  Shows a file size 0 for the /tmp/catalog.

  We recently discovered a bug in the upstream Linux kernel. It was
  fixed by this patch

  https://lkml.org/lkml/2014/10/1/35

  and that patch is scheduled to be included in powerpc tree.

  When it is included, we should back port to Ubuntu 14.10 or next
  release.

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