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([2a00:79e0:2e7c:8:5874:79f3:80da:a7a3]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1217254cd77sm12305503c88.14.2025.12.19.13.28.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Dec 2025 13:28:50 -0800 (PST) Message-ID: Date: Fri, 19 Dec 2025 14:28:48 -0700 Precedence: bulk X-Mailing-List: linux-sparse@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 07/36] lockdep: Annotate lockdep assertions for context analysis To: Marco Elver Cc: Peter Zijlstra , Boqun Feng , Ingo Molnar , Will Deacon , "David S. Miller" , Luc Van Oostenryck , Chris Li , "Paul E. McKenney" , Alexander Potapenko , Arnd Bergmann , Christoph Hellwig , Dmitry Vyukov , Eric Dumazet , Frederic Weisbecker , Greg Kroah-Hartman , Herbert Xu , Ian Rogers , Jann Horn , Joel Fernandes , Johannes Berg , Jonathan Corbet , Josh Triplett , Justin Stitt , Kees Cook , Kentaro Takeda , Lukas Bulwahn , Mark Rutland , Mathieu Desnoyers , Miguel Ojeda , Nathan Chancellor , Neeraj Upadhyay , Nick Desaulniers , Steven Rostedt , Tetsuo Handa , Thomas Gleixner , Thomas Graf , Uladzislau Rezki , Waiman Long , kasan-dev@googlegroups.com, linux-crypto@vger.kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-sparse@vger.kernel.org, linux-wireless@vger.kernel.org, llvm@lists.linux.dev, rcu@vger.kernel.org References: <20251219154418.3592607-1-elver@google.com> <20251219154418.3592607-8-elver@google.com> Content-Language: en-US From: Bart Van Assche In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/19/25 2:16 PM, Marco Elver wrote: > It's basically an escape hatch to defer to dynamic analysis where the > limits of the static analysis are reached. That's not how lockdep_assert_held() is used in the kernel. This macro is more often than not used to document assumptions that can be verified at compile time. This patch seems like a step in the wrong direction to me because it *suppresses* compile time analysis compile-time analysis is useful. I think that this patch either should be dropped or that the __assume() annotations should be changed into __must_hold() annotations. Bart.