linux-kernel - [PATCH 12/13] selftests/fs/mount-notify-ns: Fix build failures seen with -Werror

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Message-ID: <20251204161729.2448052-13-linux@roeck-us.net>
Date: Thu,  4 Dec 2025 08:17:26 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Shuah Khan <shuah@...nel.org>
Cc: Christian Brauner <brauner@...nel.org>,
	Elizabeth Figura <zfigura@...eweavers.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Kees Cook <kees@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	wine-devel@...ehq.org,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Amir Goldstein <amir73il@...il.com>
Subject: [PATCH 12/13] selftests/fs/mount-notify-ns: Fix build failures seen with -Werror

Fix

mount-notify_test_ns.c: In function ‘fanotify_rmdir’:
mount-notify_test_ns.c:494:17: error:
	ignoring return value of ‘chdir’ declared with attribute ‘warn_unused_result’

by checking and then ignoring the return value of chdir().

Fixes: 781091f3f5945 ("selftests/fs/mount-notify: add a test variant running inside userns")
Cc: Amir Goldstein <amir73il@...il.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 .../selftests/filesystems/mount-notify/mount-notify_test_ns.c  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
index 9f57ca46e3af..949c76797f92 100644
--- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
+++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
@@ -491,7 +491,8 @@ TEST_F(fanotify, rmdir)
 	ASSERT_GE(ret, 0);
 
 	if (ret == 0) {
-		chdir("/");
+		if (chdir("/"))
+			;
 		unshare(CLONE_NEWNS);
 		mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL);
 		umount2("/a", MNT_DETACH);
-- 
2.43.0