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(2001-b400-e28d-0ed7-4d5a-39b4-7c51-4c71.emome-ip6.hinet.net. [2001:b400:e28d:ed7:4d5a:39b4:7c51:4c71]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-25a2ac085f9sm23656115ad.117.2025.09.10.04.16.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Sep 2025 04:16:18 -0700 (PDT) Message-ID: <270488a6-ec6b-4b38-aa30-b5c9e08cdd18@gmail.com> Date: Wed, 10 Sep 2025 19:16:13 +0800 Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/net: fix unused return value warnings in ksft.h To: Jakub Kicinski Cc: "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Shuah Khan , netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev References: <20250906-selftests-net-ksft-v1-1-f1577cea3f68@gmail.com> <20250908182018.28d9ff10@kernel.org> <20250909162551.5224a3dc@kernel.org> Content-Language: en-US From: "Nai-Chen(Simone) Cheng" In-Reply-To: <20250909162551.5224a3dc@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Jakub, On 2025-09-10 07:25, Jakub Kicinski wrote: > Sounds good! I tried the direct void casting approach, but it still generates warnings with GCC 14.2.0: (void)write(fd, msg, sizeof(msg)); still shows: warning: ignoring return value of 'write'... After further researching, I found this appears to be a known GCC/glibc issue dating back to 2015 where direct void casting doesn't work for functions with __warn_unused_result__. [1] Since this is a long-standing toolchain issue and direct void casting won't suppress warning, I think you can skip this patch. Thank you! [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425 Best Regards, Nai-Chen Cheng