[Bug 1333499] [NEW] PowerPC 8xx dcbz workaround impacts 64bit

[Anton Blanchard]

Public bug reported:

On ppc64 we notice each process calls mfpvr twice. This faults and gets
emulated in the kernel.

We have counters to track this:

# cat /sys/kernel/debug/powerpc/emulated_instructions/mfpvr
2370
# cat /sys/kernel/debug/powerpc/emulated_instructions/mfpvr
2372
# cat /sys/kernel/debug/powerpc/emulated_instructions/mfpvr
2374

This was traced back to an 8xx workaround for a dcbz issue.

** Affects: eglibc (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: eglibc (Ubuntu Trusty)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1333499

Title:
  PowerPC 8xx dcbz workaround impacts 64bit

Status in “eglibc” package in Ubuntu:
  New
Status in “eglibc” source package in Trusty:
  New

Bug description:
  On ppc64 we notice each process calls mfpvr twice. This faults and
  gets emulated in the kernel.

  We have counters to track this:

  # cat /sys/kernel/debug/powerpc/emulated_instructions/mfpvr
  2370
  # cat /sys/kernel/debug/powerpc/emulated_instructions/mfpvr
  2372
  # cat /sys/kernel/debug/powerpc/emulated_instructions/mfpvr
  2374

  This was traced back to an 8xx workaround for a dcbz issue.

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