diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c
index aded06cab285..851284395b29 100644
--- a/tools/testing/selftests/mm/uffd-common.c
+++ b/tools/testing/selftests/mm/uffd-common.c
@@ -555,6 +555,52 @@ void *uffd_poll_thread(void *arg)
 	return NULL;
 }
 
+void *uffd_read_thread(void *arg)
+{
+	struct uffd_args *args = (struct uffd_args *)arg;
+	struct uffd_msg msg;
+
+	sem_post(&uffd_read_sem);
+	/* from here cancellation is ok */
+
+	for (;;) {
+		if (uffd_read_msg(uffd, &msg))
+			continue;
+		uffd_handle_page_fault(&msg, args);
+	}
+
+	return NULL;
+}
+
+void uffd_fault_thread_create(pthread_t *thread, pthread_attr_t *attr,
+			      struct uffd_args *args, bool poll)
+{
+	if (poll) {
+		if (pthread_create(thread, attr, uffd_poll_thread, args))
+			err("uffd_poll_thread create");
+	} else {
+		if (pthread_create(thread, attr, uffd_read_thread, args))
+			err("uffd_read_thread create");
+		sem_wait(&uffd_read_sem);
+	}
+}
+
+void uffd_fault_thread_join(pthread_t thread, int cpu, bool poll)
+{
+	char c = 1;
+
+	if (poll) {
+		if (write(pipefd[cpu*2+1], &c, 1) != 1)
+			err("pipefd write error");
+	} else {
+		if (pthread_cancel(thread))
+			err("pthread_cancel()");
+	}
+
+	if (pthread_join(thread, NULL))
+		err("pthread_join()");
+}
+
 static void retry_copy_page(int ufd, struct uffdio_copy *uffdio_copy,
 			    unsigned long offset)
 {
diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h
index 521523baded1..9d66ad5c52cb 100644
--- a/tools/testing/selftests/mm/uffd-common.h
+++ b/tools/testing/selftests/mm/uffd-common.h
@@ -114,6 +114,10 @@ void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args);
 int __copy_page(int ufd, unsigned long offset, bool retry, bool wp);
 int copy_page(int ufd, unsigned long offset, bool wp);
 void *uffd_poll_thread(void *arg);
+void *uffd_read_thread(void *arg);
+void uffd_fault_thread_create(pthread_t *thread, pthread_attr_t *attr,
+			      struct uffd_args *args, bool poll);
+void uffd_fault_thread_join(pthread_t thread, int cpu, bool poll);
 
 int uffd_open_dev(unsigned int flags);
 int uffd_open_sys(unsigned int flags);
diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
index 7219f55ae794..915795e33432 100644
--- a/tools/testing/selftests/mm/uffd-stress.c
+++ b/tools/testing/selftests/mm/uffd-stress.c
@@ -125,23 +125,6 @@ static int copy_page_retry(int ufd, unsigned long offset)
 	return __copy_page(ufd, offset, true, test_uffdio_wp);
 }
 
-static void *uffd_read_thread(void *arg)
-{
-	struct uffd_args *args = (struct uffd_args *)arg;
-	struct uffd_msg msg;
-
-	sem_post(&uffd_read_sem);
-	/* from here cancellation is ok */
-
-	for (;;) {
-		if (uffd_read_msg(uffd, &msg))
-			continue;
-		uffd_handle_page_fault(&msg, args);
-	}
-
-	return NULL;
-}
-
 static void *background_thread(void *arg)
 {
 	unsigned long cpu = (unsigned long) arg;
@@ -186,16 +169,10 @@ static int stress(struct uffd_args *args)
 		if (pthread_create(&locking_threads[cpu], &attr,
 				   locking_thread, (void *)cpu))
 			return 1;
-		if (bounces & BOUNCE_POLL) {
-			if (pthread_create(&uffd_threads[cpu], &attr, uffd_poll_thread, &args[cpu]))
-				err("uffd_poll_thread create");
-		} else {
-			if (pthread_create(&uffd_threads[cpu], &attr,
-					   uffd_read_thread,
-					   (void *)&args[cpu]))
-				return 1;
-			sem_wait(&uffd_read_sem);
-		}
+
+		uffd_fault_thread_create(&uffd_threads[cpu], &attr,
+					 &args[cpu], bounces & BOUNCE_POLL);
+
 		if (pthread_create(&background_threads[cpu], &attr,
 				   background_thread, (void *)cpu))
 			return 1;
@@ -220,21 +197,9 @@ static int stress(struct uffd_args *args)
 		if (pthread_join(locking_threads[cpu], NULL))
 			return 1;
 
-	for (cpu = 0; cpu < nr_cpus; cpu++) {
-		char c;
-		if (bounces & BOUNCE_POLL) {
-			if (write(pipefd[cpu*2+1], &c, 1) != 1)
-				err("pipefd write error");
-			if (pthread_join(uffd_threads[cpu],
-					 (void *)&args[cpu]))
-				return 1;
-		} else {
-			if (pthread_cancel(uffd_threads[cpu]))
-				return 1;
-			if (pthread_join(uffd_threads[cpu], NULL))
-				return 1;
-		}
-	}
+	for (cpu = 0; cpu < nr_cpus; cpu++)
+		uffd_fault_thread_join(uffd_threads[cpu], cpu,
+				       bounces & BOUNCE_POLL);
 
 	return 0;
 }
