[SRU][Xenial][Artful][Bionic][PATCH 0/1] s390/cpum_sf: ensure sample frequency of perf event attributes is non-zero

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1772593

== 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
isue.  

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 reporter.
The bug reporter states the test kernel resolved the bug.

Hendrik Brueckner (1):
  s390/cpum_sf: ensure sample frequency of perf event attributes is
    non-zero

 arch/s390/kernel/perf_cpum_sf.c | 4 ++++
 1 file changed, 4 insertions(+)

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2.7.4