[SRU][B][Patch 0/1] Ubuntu 18.04 - wrong cpu-mf counter number (LP: 1847109)

[frank.heimes at canonical.com]

Buglink: https://bugs.launchpad.net/bugs/1847109

SRU Justification:

[Impact]

* wrong cpu-mf counter number of LAST_HOST_TRANSLATIONS

[Fix]

* 81507f38d427ebed3291a3c153a798937c998140 81507f38 "s390/cpum_cf: correct counter number of LAST_HOST_TRANSLATIONS"

[Test Case]

* inspect the counter number of the LAST_HOST_TRANSLATIONS (virtual) file

* cat /sys/devices/cpum_cf/events/LAST_HOST_TRANSLATIONS

* returns 'event=0x00e9', but should be 'event=0x00e8'

* event is only available on z14 and higher, hence Canonical can only do regression testing - IBM the functional verification

[Regression Potential] 

* very minimal, patch just changes one hex number in one code line

* change is limited to z14 (and higher) hardware counters only

[Other Info]

* fix/patch got upstream accepted with 4.16

* hence it's already in (cosmic and) disco and eoan and only need to be applied to bionic 4.15

Hendrik Brueckner (1):
  From: Hendrik Brueckner <brueckner at linux.vnet.ibm.com>

 arch/s390/kernel/perf_cpum_cf_events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.7.4