linux-kernel - [PATCH 2/2] selftests: futex: Add FUTEX_LOCK

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Date:   Thu, 28 Oct 2021 16:29:36 -0300
From:   André Almeida <andrealmeid@...labora.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>
Cc:     André Almeida <andrealmeid@...labora.com>
Subject: [PATCH 2/2] selftests: futex: Add FUTEX_LOCK_PI2 for timeout test

Since commit bf22a6976897 ("futex: Provide FUTEX_LOCK_PI2 to support clock
selection"), there's a new operation that supports CLOCK_MONOTONIC and
CLOCK_REALTIME. Test the timeout interface of FUTEX_LOCK_PI2 operation.

Signed-off-by: André Almeida <andrealmeid@...labora.com>
---
 .../futex/functional/futex_wait_timeout.c          | 14 +++++++++++++-
 tools/testing/selftests/futex/include/futextest.h  | 14 ++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/futex/functional/futex_wait_timeout.c b/tools/testing/selftests/futex/functional/futex_wait_timeout.c
index 3651ce17beeb..c64967c787ca 100644
--- a/tools/testing/selftests/futex/functional/futex_wait_timeout.c
+++ b/tools/testing/selftests/futex/functional/futex_wait_timeout.c
@@ -125,7 +125,7 @@ int main(int argc, char *argv[])
 	}
 
 	ksft_print_header();
-	ksft_set_plan(9);
+	ksft_set_plan(11);
 	ksft_print_msg("%s: Block on a futex and wait for timeout\n",
 	       basename(argv[0]));
 	ksft_print_msg("\tArguments: timeout=%ldns\n", timeout_ns);
@@ -182,6 +182,18 @@ int main(int argc, char *argv[])
 	res = futex_lock_pi(&futex_pi, NULL, 0, FUTEX_CLOCK_REALTIME);
 	test_timeout(res, &ret, "futex_lock_pi invalid timeout flag", ENOSYS);
 
+	/* FUTEX_LOCK_PI2 with CLOCK_REALTIME */
+	if (futex_get_abs_timeout(CLOCK_REALTIME, &to, timeout_ns))
+		return RET_FAIL;
+	res = futex_lock_pi2(&futex_pi, &to, 0, FUTEX_CLOCK_REALTIME);
+	test_timeout(res, &ret, "futex_lock_pi2 realtime", ETIMEDOUT);
+
+	/* FUTEX_LOCK_PI2 with CLOCK_MONOTONIC */
+	if (futex_get_abs_timeout(CLOCK_MONOTONIC, &to, timeout_ns))
+		return RET_FAIL;
+	res = futex_lock_pi2(&futex_pi, &to, 0, 0);
+	test_timeout(res, &ret, "futex_lock_pi2 monotonic", ETIMEDOUT);
+
 	/* futex_waitv with CLOCK_MONOTONIC */
 	if (futex_get_abs_timeout(CLOCK_MONOTONIC, &to, timeout_ns))
 		return RET_FAIL;
diff --git a/tools/testing/selftests/futex/include/futextest.h b/tools/testing/selftests/futex/include/futextest.h
index ddbcfc9b7bac..9a0bd96d354b 100644
--- a/tools/testing/selftests/futex/include/futextest.h
+++ b/tools/testing/selftests/futex/include/futextest.h
@@ -38,6 +38,9 @@ typedef volatile u_int32_t futex_t;
 #ifndef FUTEX_CMP_REQUEUE_PI
 #define FUTEX_CMP_REQUEUE_PI		12
 #endif
+#ifndef FUTEX_PI2
+#define FUTEX_PI2			13
+#endif
 #ifndef FUTEX_WAIT_REQUEUE_PI_PRIVATE
 #define FUTEX_WAIT_REQUEUE_PI_PRIVATE	(FUTEX_WAIT_REQUEUE_PI | \
 					 FUTEX_PRIVATE_FLAG)
@@ -124,6 +127,17 @@ futex_lock_pi(futex_t *uaddr, struct timespec *timeout, int detect,
 	return futex(uaddr, FUTEX_LOCK_PI, detect, timeout, NULL, 0, opflags);
 }
 
+/**
+ * futex_lock_pi2() - block on uaddr as a PI mutex
+ * @detect:	whether (1) or not (0) to perform deadlock detection
+ */
+static inline int
+futex_lock_pi2(futex_t *uaddr, struct timespec *timeout, int detect,
+	       int opflags)
+{
+	return futex(uaddr, FUTEX_LOCK_PI2, detect, timeout, NULL, 0, opflags);
+}
+
 /**
  * futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
  */
-- 
2.33.1