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Fri, 05 Dec 2025 09:12:25 -0800 (PST) Sender: Guenter Roeck From: Guenter Roeck To: Shuah Khan Cc: Jakub Kicinski , Christian Brauner , Thomas Gleixner , Ingo Molnar , Eric Dumazet , Kees Cook , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, wine-devel@winehq.org, netdev@vger.kernel.org, bpf@vger.kernel.org, Guenter Roeck , Amir Goldstein Subject: [PATCH v2 12/13] selftests/fs/mount-notify-ns: Fix build warning Date: Fri, 5 Dec 2025 09:10:06 -0800 Message-ID: <20251205171010.515236-13-linux@roeck-us.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20251205171010.515236-1-linux@roeck-us.net> References: <20251205171010.515236-1-linux@roeck-us.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Fix mount-notify_test_ns.c: In function =E2=80=98fanotify_rmdir=E2=80=99: mount-notify_test_ns.c:494:17: warning: ignoring return value of =E2=80=98chdir=E2=80=99 declared with attribute = =E2=80=98warn_unused_result=E2=80=99 by checking the return value of chdir() and displaying an error message if it returns an error. Fixes: 781091f3f5945 ("selftests/fs/mount-notify: add a test variant runnin= g inside userns") Cc: Amir Goldstein Signed-off-by: Guenter Roeck --- v2: Update subject and description to reflect that the patch fixes a build warning. Use perror() to display an error message if chdir() returns an error. .../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_t= est_ns.c index 9f57ca46e3af..90bec6faf64e 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); =20 if (ret =3D=3D 0) { - chdir("/"); + if (chdir("/")) + perror("chdir()"); unshare(CLONE_NEWNS); mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL); umount2("/a", MNT_DETACH); --=20 2.45.2