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

[Khaled Elmously]

Applied to X/A/B

On 2018-05-25 07:38:50 , Joseph Salisbury wrote:
> 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(+)
> 
> -- 
> 2.7.4
> 
> 
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