linux-kernel - [PATCH net-next] vsock/test: add a final full barrier after run all tests

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Message-ID: <20251223162210.43976-1-sgarzare@redhat.com>
Date: Tue, 23 Dec 2025 17:22:10 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: netdev@...r.kernel.org
Cc: virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH net-next] vsock/test: add a final full barrier after run all tests

From: Stefano Garzarella <sgarzare@...hat.com>

If the last test fails, the other side still completes correctly,
which could lead to false positives.

Let's add a final barrier that ensures that the last test has finished
correctly on both sides, but also that the two sides agree on the
number of tests to be performed.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 tools/testing/vsock/util.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c
index d843643ced6b..9430ef5b8bc3 100644
--- a/tools/testing/vsock/util.c
+++ b/tools/testing/vsock/util.c
@@ -511,6 +511,18 @@ void run_tests(const struct test_case *test_cases,
 
 		printf("ok\n");
 	}
+
+	printf("All tests have been executed. Waiting other peer...");
+	fflush(stdout);
+
+	/*
+	 * Final full barrier, to ensure that all tests have been run and
+	 * that even the last one has been successful on both sides.
+	 */
+	control_writeln("COMPLETED");
+	control_expectln("COMPLETED");
+
+	printf("ok\n");
 }
 
 void list_tests(const struct test_case *test_cases)
-- 
2.52.0