[PATCH 5.15 072/511] selftests/futex: Order calls to futex_lock_pi

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nysal Jan K.A <nysal@xxxxxxxxxxxxx>

[ Upstream commit fbf4dec702774286db409815ffb077711a96b824 ]

Observed occassional failures in the futex_wait_timeout test:

ok 1 futex_wait relative succeeds
ok 2 futex_wait_bitset realtime succeeds
ok 3 futex_wait_bitset monotonic succeeds
ok 4 futex_wait_requeue_pi realtime succeeds
ok 5 futex_wait_requeue_pi monotonic succeeds
not ok 6 futex_lock_pi realtime returned 0
......

The test expects the child thread to complete some steps before
the parent thread gets to run. There is an implicit expectation
of the order of invocation of futex_lock_pi between the child thread
and the parent thread. Make this order explicit. If the order is
not met, the futex_lock_pi call in the parent thread succeeds and
will not timeout.

Fixes: f4addd54b161 ("selftests: futex: Expand timeout test")
Signed-off-by: Nysal Jan K.A <nysal@xxxxxxxxxxxxx>
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 .../selftests/futex/functional/futex_wait_timeout.c        | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/futex/functional/futex_wait_timeout.c b/tools/testing/selftests/futex/functional/futex_wait_timeout.c
index 1f8f6daaf1e70..86ac205ea8e18 100644
--- a/tools/testing/selftests/futex/functional/futex_wait_timeout.c
+++ b/tools/testing/selftests/futex/functional/futex_wait_timeout.c
@@ -23,6 +23,7 @@
 
 static long timeout_ns = 100000;	/* 100us default timeout */
 static futex_t futex_pi;
+static pthread_barrier_t barrier;
 
 void usage(char *prog)
 {
@@ -47,6 +48,8 @@ void *get_pi_lock(void *arg)
 	if (ret != 0)
 		error("futex_lock_pi failed\n", ret);
 
+	pthread_barrier_wait(&barrier);
+
 	/* Blocks forever */
 	ret = futex_wait(&lock, 0, NULL, 0);
 	error("futex_wait failed\n", ret);
@@ -123,6 +126,7 @@ int main(int argc, char *argv[])
 	       basename(argv[0]));
 	ksft_print_msg("\tArguments: timeout=%ldns\n", timeout_ns);
 
+	pthread_barrier_init(&barrier, NULL, 2);
 	pthread_create(&thread, NULL, get_pi_lock, NULL);
 
 	/* initialize relative timeout */
@@ -156,6 +160,9 @@ int main(int argc, char *argv[])
 	res = futex_wait_requeue_pi(&f1, f1, &futex_pi, &to, 0);
 	test_timeout(res, &ret, "futex_wait_requeue_pi monotonic", ETIMEDOUT);
 
+	/* Wait until the other thread calls futex_lock_pi() */
+	pthread_barrier_wait(&barrier);
+	pthread_barrier_destroy(&barrier);
 	/*
 	 * FUTEX_LOCK_PI with CLOCK_REALTIME
 	 * Due to historical reasons, FUTEX_LOCK_PI supports only realtime
-- 
2.40.1






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