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Sun, 03 Dec 2023 23:50:38 -0800 (PST) Received: from localhost ([102.36.222.112]) by smtp.gmail.com with ESMTPSA id r21-20020a05600c35d500b0040b3e79bad3sm13947798wmq.40.2023.12.03.23.50.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Dec 2023 23:50:38 -0800 (PST) Date: Mon, 4 Dec 2023 10:50:34 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Dragos Bogdan Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Ley Foon Tan , Beniamin Bia Subject: drivers/clk/uniphier/clk-uniphier-mux.c:47 uniphier_clk_mux_get_parent() warn: signedness bug returning '(-22)' Message-ID: <6322ed2e-8f2d-49e5-bebf-2fb109790cd4@suswa.mountain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Dragos, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 33cc938e65a98f1d29d0a18403dbbee050dcad9a commit: f26e433185cb2830b933df3a4d378558fe2fccd9 arch: nios2: Enable the common clk subsystem on Nios2 config: nios2-randconfig-r081-20231120 (https://download.01.org/0day-ci/archive/20231204/202312041541.LK8ZbiIf-lkp@intel.com/config) compiler: nios2-linux-gcc (GCC) 13.2.0 reproduce: (https://download.01.org/0day-ci/archive/20231204/202312041541.LK8ZbiIf-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202312041541.LK8ZbiIf-lkp@intel.com/ smatch warnings: drivers/clk/uniphier/clk-uniphier-mux.c:47 uniphier_clk_mux_get_parent() warn: signedness bug returning '(-22)' vim +47 drivers/clk/uniphier/clk-uniphier-mux.c 734d82f4a678e8 Masahiro Yamada 2016-09-16 31 static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw) 734d82f4a678e8 Masahiro Yamada 2016-09-16 32 { 734d82f4a678e8 Masahiro Yamada 2016-09-16 33 struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw); 734d82f4a678e8 Masahiro Yamada 2016-09-16 34 int num_parents = clk_hw_get_num_parents(hw); 734d82f4a678e8 Masahiro Yamada 2016-09-16 35 int ret; c0ce317f0c8863 Masahiro Yamada 2016-10-17 36 unsigned int val; 734d82f4a678e8 Masahiro Yamada 2016-09-16 37 u8 i; 734d82f4a678e8 Masahiro Yamada 2016-09-16 38 734d82f4a678e8 Masahiro Yamada 2016-09-16 39 ret = regmap_read(mux->regmap, mux->reg, &val); 734d82f4a678e8 Masahiro Yamada 2016-09-16 40 if (ret) 734d82f4a678e8 Masahiro Yamada 2016-09-16 41 return ret; 734d82f4a678e8 Masahiro Yamada 2016-09-16 42 734d82f4a678e8 Masahiro Yamada 2016-09-16 43 for (i = 0; i < num_parents; i++) 734d82f4a678e8 Masahiro Yamada 2016-09-16 44 if ((mux->masks[i] & val) == mux->vals[i]) 734d82f4a678e8 Masahiro Yamada 2016-09-16 45 return i; 734d82f4a678e8 Masahiro Yamada 2016-09-16 46 734d82f4a678e8 Masahiro Yamada 2016-09-16 @47 return -EINVAL; kbuild has decided to dig through ancient warnings today. This function is type u8 so returning -EINVAL doesn't work. 734d82f4a678e8 Masahiro Yamada 2016-09-16 48 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki