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** Tags added: verification-needed-artful

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  cpum_sf: ensure sample freq is non-zero

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  A regression was introduced by commit 8c069ff4bd606 in v3.14-rc1.  IBM
  is requested commit 4bbaf2584b86 in all Ubuntu kernels to resolve this

  Bug Description: cpum_sf: ensure sample freq is non-zero
  Symptom: A kernel crash might occur.
  Problem: An FP divide exception during the sample rate
                initialization for the hardware sampling facility.
  Solution: Ensure that the sample frequency of the perf
                event attribute is non-zero.

  == Fix ==
  4bbaf2584b86 ("s390/cpum_sf: ensure sample frequency of perf event attributes 
is non-zero")

  == Regression Potential ==
  Low.  Fix is specific to s390.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
  The bug reporter states the test kernel resolved the bug.

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