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Fri, 05 Dec 2025 09:12:27 -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 , David Wei Subject: [PATCH v2 13/13] selftests: net: tfo: Fix build warning Date: Fri, 5 Dec 2025 09:10:07 -0800 Message-ID: <20251205171010.515236-14-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 tfo.c: In function =E2=80=98run_server=E2=80=99: tfo.c:84:9: warning: ignoring return value of =E2=80=98read=E2=80=99 declar= ed with attribute =E2=80=98warn_unused_result=E2=80=99 by evaluating the return value from read() and displaying an error message if it reports an error. Fixes: c65b5bb2329e3 ("selftests: net: add passive TFO test binary") Cc: David Wei 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 read() returns an error. tools/testing/selftests/net/tfo.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/tfo.c b/tools/testing/selftests/ne= t/tfo.c index eb3cac5e583c..8d82140f0f76 100644 --- a/tools/testing/selftests/net/tfo.c +++ b/tools/testing/selftests/net/tfo.c @@ -81,7 +81,8 @@ static void run_server(void) if (getsockopt(connfd, SOL_SOCKET, SO_INCOMING_NAPI_ID, &opt, &len) < 0) error(1, errno, "getsockopt(SO_INCOMING_NAPI_ID)"); =20 - read(connfd, buf, 64); + if (read(connfd, buf, 64) < 0) + perror("read()"); fprintf(outfile, "%d\n", opt); =20 fclose(outfile); --=20 2.45.2