background_threads  588 tools/testing/selftests/vm/userfaultfd.c 	pthread_t background_threads[nr_cpus];
background_threads  607 tools/testing/selftests/vm/userfaultfd.c 		if (pthread_create(&background_threads[cpu], &attr,
background_threads  612 tools/testing/selftests/vm/userfaultfd.c 		if (pthread_join(background_threads[cpu], NULL))