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---Problem Description---
tm_trap_test failed on P8 compat mode [16.04.04 daily build as well bionic ] 
guests on a P9 host running bionic final beta version.
Contact Information = srikanth/ 
---uname output---

16.04.04 Guest running in P8compat mode:

Linux guest 4.15.0-15-generic #16~16.04.1-Ubuntu SMP Thu Apr 5 12:18:22 UTC 
2018 ppc64le ppc64le ppc64le GNU/Linux
18.04 guest running in P8compat mode:
Linux ubuntu 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:57:51 UTC 2018 
ppc64le ppc64le ppc64le GNU/Linux

Machine Type = boston-LC 
A debugger is not configured
---Steps to Reproduce---
 1. Log into P9 Ubuntu 18.04 host, take console of guest `srikanth_ubuntu160404`
2. Run TM selftests
git clone --depth 1;cd 
linux/tools/testing/selftests/powerpc/;git log --oneline -1;make;make -C tm 

We will observe one of the tm tests failing, mentioned below:

selftests: tm-trap
test: tm_trap_test
tags: git_version:c18bb39
Little-Endian machine detected. Checking if endianness flips inadvertently on 
trap in TM... yes!
failure: tm_trap_test
not ok 1..11 selftests:  tm-trap [FAIL]

Expected result: All tm selftests should have been pass on the P8 compat 
guest.. giventhat we had TM workaround patches in latest Ubuntu BIONIC host 
Stack trace output:
Oops output:
System Dump Info:
  The system is not configured to capture a system dump.
*Additional Instructions for srikanth/ 
-Attach sysctl -a output output to the bug.

== Comment: #2 - SRIKANTH AITHAL <> - 2018-04-10
01:32:00 ==

== Comment: #3 - SRIKANTH AITHAL <> - 2018-04-10 01:33:41 

== Comment: #4 - SRIKANTH AITHAL <> - 2018-04-10 01:34:02 

Please pick 

 `1c200e63d055 ("powerpc/tm: Fix endianness flip on trap")`

ie. the commit that the test was written for

** Affects: ubuntu-power-systems
     Importance: Critical
     Assignee: Canonical Kernel Team (canonical-kernel-team)
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New

** Tags: architecture-ppc64le bugnameltc-166570 severity-critical 
[LTC Test] Ubuntu 18.04: tm_trap_test failed on P8 compat mode guest
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