This is now affecting Bionic

With upstream commit a1d6cd88c "selftests/ftrace: event_triggers: wait
longer for test_event_enable" applied via stable update, ftrace in
Bionic proposed (4.15.0-207.218) is now failing with:

$ sudo ./ftracetest ./test.d/ftrace/func_event_triggers.tc 
[1] ftrace - test for function event triggers   [FAIL]
[2] (instance)  ftrace - test for function event triggers       [FAIL]

With -v added to the command you will see it failing with:
./ftracetest: 52: [: 0: unexpected operator

The "==" operator fix can solve this problem.

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Bionic)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/2006453

Title:
  Fix selftests/ftracetests/Meta-selftests

Status in ubuntu-kernel-tests:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Confirmed
Status in linux source package in Focal:
  Fix Committed
Status in linux source package in Jammy:
  Fix Committed

Bug description:
  [SRU Justification]

  == Impact ==
  This subtest checks for bashisms in the test scripts of ftracetests. A recent 
stable change added such a case. This is harmless but causes the Meta-selftests 
to fail. The offending commit is "selftests/ftrace: event_triggers: wait longer 
for test_event_enable" which adds:
  +       if [ "$e" == $val ]; then

  == Fix ==
  Replace the test with
  +       if [ "$e" = $val ]; then

  == Testcase ==
  Running the kernel selftests/ftracetest (done in ADT and RT) should no longer 
show "Meta-selftests" as FAILed.

  == Regression Potential ==
  This affects only the selftest suite and only ftrace subtests. Any change 
would only be observable there.

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