[PATCH 0/4] test-ww_mutex: Miscellaneous fixes

[Håkon Bugge]

This series fixes:
     - module cleanup
     - error propagation from stress workers
     - transient -EDEADLK handling in test_cycle_work()
     - timeout-related false negatives in stress_inorder_work()

The series is based on v7.1 and has been tested on a 96-CPU x86_64
bare-metal system and a 160-CPU arm64 bare-metal system. Both systems
completed 100 iterations of
tools/testing/selftests/locking/ww_mutex.sh successfully.

It is worth mentioning that the last patch retries up to 10,000 lock
acquisitions after timeout. This value was determined empirically: 10
and 100 retries were insufficient on the test systems, while 10,000
provided stable results and avoided false negatives.

Håkon Bugge (4):
  test-ww_mutex: Fix module cleanup
  test-ww_mutex: Report errors from stress workers
  test-ww_mutex: Handle transient -EDEADLK in test_cycle_work
  test-ww_mutex: Retry lock acquisition after timeout if deadlocked

 kernel/locking/test-ww_mutex.c | 55 +++++++++++++++++++++++++---------
 1 file changed, 41 insertions(+), 14 deletions(-)

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2.43.5