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[Chris J Arges <1415919@xxxxxxxxxxxxxxxxxx>]

Laurent,
Because this patch is already in v3.19, when Vivid rebases to 3.19 the fix will come in through that update.
Thanks,

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https://bugs.launchpad.net/bugs/1415919

Title:
  Ubuntu - Fixing RTAS call from xmon (running ppc64le on PowerVM)

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Utopic:
  Fix Committed

Bug description:
  [Impact]
  ---Problem Description---
  The commit 3b8a3c010969 ("powerpc/pseries: Fix endiannes issue in RTAS call from xmon") was fixing an endianness issue in the call made from xmon to RTAS. However, as Michael Ellerman noticed, this fix was not complete, the token value was not byte swapped. This lead to call an unexpected and most of the time unexisting RTAS function, which is silently ignored by RTAS.

  [Test Case]
  # echo x > /proc/sysrq-trigger
  This should put us in the xmon debugger without errors.

  [Fix]
  This bug is opened to ensure Linux distro will taking up this upstream patch:
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e6eb2eba494d6f99e69ca3c3748cd37a2544ab38

  This bug is affecting Ubuntu 15.04 and 15.10.

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