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This reverts commite61ef21e27. uffd_poll_thread may be called by other tests that do not initialize the pthread_barrier, so this approach is not correct. This will revert to using atomic_bool instead. Link: https://lkml.kernel.org/r/20241018171734.2315053-3-edliaw@google.com Fixes:e61ef21e27("selftests/mm: replace atomic_bool with pthread_barrier_t") Signed-off-by: Edward Liaw <edliaw@google.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Peter Xu <peterx@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>