linux-kernel - [PATCH 1/3] selftests/futex: getopt() requires int as return value.

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Message-ID: <20250528085521.1938355-2-bigeasy@linutronix.de>
Date: Wed, 28 May 2025 10:55:19 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 1/3] selftests/futex: getopt() requires int as return value.

Mark reported that futex_priv_hash fails on ARM64.
It turns out that the command line parsing does not terminate properly
and ends in the default case assuming an invalid option was passed.

Use an int as the return type for getopt().

Reported-by: Mark Brown <broonie@...nel.org>
Closes: https://lore.kernel.org/all/31869a69-063f-44a3-a079-ba71b2506cce@sirena.org.uk/
Fixes: 3163369407baf ("selftests/futex: Add futex_numa_mpol")
Fixes: cda95faef7bcf ("selftests/futex: Add futex_priv_hash")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 tools/testing/selftests/futex/functional/futex_numa_mpol.c | 2 +-
 tools/testing/selftests/futex/functional/futex_priv_hash.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/futex/functional/futex_numa_mpol.c b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
index 20a9d3ecf7433..564dbd02d2f46 100644
--- a/tools/testing/selftests/futex/functional/futex_numa_mpol.c
+++ b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
@@ -144,7 +144,7 @@ int main(int argc, char *argv[])
 	struct futex32_numa *futex_numa;
 	int mem_size, i;
 	void *futex_ptr;
-	char c;
+	int c;
 
 	while ((c = getopt(argc, argv, "chv:")) != -1) {
 		switch (c) {
diff --git a/tools/testing/selftests/futex/functional/futex_priv_hash.c b/tools/testing/selftests/futex/functional/futex_priv_hash.c
index 2dca18fefedcd..24a92dc94eb86 100644
--- a/tools/testing/selftests/futex/functional/futex_priv_hash.c
+++ b/tools/testing/selftests/futex/functional/futex_priv_hash.c
@@ -130,7 +130,7 @@ int main(int argc, char *argv[])
 	pthread_mutexattr_t mutex_attr_pi;
 	int use_global_hash = 0;
 	int ret;
-	char c;
+	int c;
 
 	while ((c = getopt(argc, argv, "cghv:")) != -1) {
 		switch (c) {
-- 
2.49.0