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Fri, 26 Sep 2025 01:00:30 -0700 (PDT) Message-ID: Date: Fri, 26 Sep 2025 09:00:32 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/3] selftests/bpf: Prepare to add -Wsign-compare for bpf selftests To: Andrii Nakryiko , daniel@iogearbox.net Cc: andrii@kernel.org, eddyz87@gmail.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, matttbe@kernel.org, martineau@kernel.org, geliang@kernel.org, davem@davemloft.net, kuba@kernel.org, hawk@kernel.org, linux@jordanrome.com, ameryhung@gmail.com, toke@redhat.com, houtao1@huawei.com, emil@etsalapatis.com, yatsenko@meta.com, isolodrai@meta.com, a.s.protopopov@gmail.com, dxu@dxuuu.xyz, memxor@gmail.com, vmalik@redhat.com, bigeasy@linutronix.de, tj@kernel.org, gregkh@linuxfoundation.org, paul@paul-moore.com, bboscaccy@linux.microsoft.com, James.Bottomley@hansenpartnership.com, mrpre@163.com, jakub@cloudflare.com, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org, mptcp@lists.linux.dev, linux-kernel-mentees@lists.linuxfoundation.org, skhan@linuxfoundation.org, david.hunter.linux@gmail.com References: <20250925103559.14876-1-mehdi.benhadjkhelifa@gmail.com> Content-Language: en-US From: Mehdi Ben Hadj Khelifa In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit > I see little value in these transformations. Did we catch any real > issue here? All this type casting and replacement is just churn. > > I certainly don't want such churn in libbpf, and I'd leave BPF > selftests as is as well. int vs u64 can have subtle and non-obvious > implications for BPF code generation (for no-alu32 variants > especially), and I think BPF CI already exposed some of those already. > > I think we can live without -Wsign-compare just fine. > I was convinced by [1] that this needed to be done not just for current version of the code but for future code being more robust initially.I have already done all the work and I can follow daniel's suggestion for the next version.Otherwise,This means then that the TODO comment to add that compiler warning in the makefile needs to be removed. Also I wanted to ask since the CI bot had success with my patch.What does this [2] mean exactly. Thank you for your time reviewing and helping. Regards, Mehdi [1]:https://github.com/kernel-patches/bpf/commit/495d2d8133fd1407519170a5238f455abbd9ec9b [2]:https://github.com/kernel-patches/bpf/actions/runs/18006172526