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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-395c83b6e92sm3443876f8f.38.2025.03.13.14.57.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Mar 2025 14:57:46 -0700 (PDT) Date: Thu, 13 Mar 2025 21:57:44 +0000 From: David Laight To: WangYuli Cc: chenhuacai@kernel.org, kernel@xen0n.name, yangtiezhu@loongson.cn, maobibo@loongson.cn, guoweikang.kernel@gmail.com, agordeev@linux.ibm.com, ast@kernel.org, usamaarif642@gmail.com, jiaxun.yang@flygoat.com, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, zhanjun@uniontech.com, niecheng1@uniontech.com, chenlinxuan@uniontech.com, donmor3000@hotmail.com, Wentao Guan Subject: Re: [PATCH] LoongArch: Fix use of logical '&&' with constant operand Message-ID: <20250313215744.69a976aa@pumpkin> In-Reply-To: References: X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) 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=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 4 Mar 2025 18:52:46 +0800 WangYuli wrote: > Fix follow error with clang-19: > > arch/loongarch/kernel/setup.c:335:40: error: use of logical '&&' with constant operand [-Werror,-Wconstant-logical-operand] > 335 | if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) { > | ^ ~~~~~~~~~~~~~~~~~ > arch/loongarch/kernel/setup.c:335:40: note: use '&' for a bitwise operation > 335 | if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) { > | ^~ > | & > arch/loongarch/kernel/setup.c:335:40: note: remove constant to silence this warning > 335 | if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) { > | ^~~~~~~~~~~~~~~~~~~~ > 1 error generated. Isn't that just 'an error too far' ? There is nothing really wrong with compile-time constants in conditionals. The kernel is full of them. Why not just disable the warning? David