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[34.48.33.21]) by smtp.gmail.com with UTF8SMTPSA id 6a1803df08f44-800fa5f6dd7sm733946d6.0.2025.09.24.13.21.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Sep 2025 13:21:08 -0700 (PDT) Date: Wed, 24 Sep 2025 16:21:07 -0400 From: Willem de Bruijn To: Wake Liu , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Simon Horman , Wake Liu Message-ID: In-Reply-To: <20250924044142.540162-1-wakel@google.com> References: <20250924044142.540162-1-wakel@google.com> Subject: Re: [PATCH] Net: psock_tpacket: Fix null argument warning in walk_tx 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: 7bit [PATCH net-next] Wake Liu wrote: > The sendto() call in walk_tx() was passing NULL as the buffer argument, > which can trigger a -Wnonnull warning with some compilers. > > Although the size is 0 and no data is actually sent, passing a null > pointer is technically incorrect. > > This commit changes NULL to an empty string literal ("") to satisfy the > non-null argument requirement and fix the compiler warning. Which library defines this argument as nonnull? I'm not aware of this restriction in the POSIX standard. This pattern is quite common. > > Signed-off-by: Wake Liu > --- > tools/testing/selftests/net/psock_tpacket.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/net/psock_tpacket.c b/tools/testing/selftests/net/psock_tpacket.c > index 221270cee3ea..0c24adbb292e 100644 > --- a/tools/testing/selftests/net/psock_tpacket.c > +++ b/tools/testing/selftests/net/psock_tpacket.c > @@ -470,7 +470,7 @@ static void walk_tx(int sock, struct ring *ring) > > bug_on(total_packets != 0); > > - ret = sendto(sock, NULL, 0, 0, NULL, 0); > + ret = sendto(sock, "", 0, 0, NULL, 0); > if (ret == -1) { > perror("sendto"); > exit(1); > -- > 2.51.0.534.gc79095c0ca-goog >