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X-IronPort-AV: E=McAfee;i="6200,9189,10192"; a="298811791" X-IronPort-AV: E=Sophos;i="5.88,191,1635231600"; d="scan'208";a="298811791" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Dec 2021 21:32:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,191,1635231600"; d="scan'208";a="612378061" Received: from lkp-server02.sh.intel.com (HELO 9e1e9f9b3bcb) ([10.239.97.151]) by orsmga004.jf.intel.com with ESMTP; 08 Dec 2021 21:32:09 -0800 Received: from kbuild by 9e1e9f9b3bcb with local (Exim 4.92) (envelope-from ) id 1mvC2K-0001Wr-D6; Thu, 09 Dec 2021 05:32:08 +0000 Date: Thu, 9 Dec 2021 13:31:43 +0800 From: kernel test robot To: Florian Fainelli Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Linus Walleij , Nicolas Saenz Julienne Subject: drivers/pinctrl/bcm/pinctrl-bcm2835.c:413:14: warning: variable 'group' is used uninitialized whenever 'for' loop exits because its condition is false Message-ID: <202112091309.HCSKbMQS-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2a987e65025e2b79c6d453b78cb5985ac6e5eb26 commit: 4434f4c50345c84373b7117b5c827a88870f9d36 pinctrl: bcm2835: Allow building driver as a module date: 6 weeks ago config: mips-randconfig-r001-20211209 (https://download.01.org/0day-ci/archive/20211209/202112091309.HCSKbMQS-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4434f4c50345c84373b7117b5c827a88870f9d36 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4434f4c50345c84373b7117b5c827a88870f9d36 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/pinctrl/bcm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/pinctrl/bcm/pinctrl-bcm2835.c:413:14: warning: variable 'group' is used uninitialized whenever 'for' loop exits because its condition is false [-Wsometimes-uninitialized] for (i = 0; i < BCM2835_NUM_IRQS; i++) { ^~~~~~~~~~~~~~~~~~~~ drivers/pinctrl/bcm/pinctrl-bcm2835.c:424:10: note: uninitialized use occurs here switch (group) { ^~~~~ drivers/pinctrl/bcm/pinctrl-bcm2835.c:413:14: note: remove the condition if it is always true for (i = 0; i < BCM2835_NUM_IRQS; i++) { ^~~~~~~~~~~~~~~~~~~~ drivers/pinctrl/bcm/pinctrl-bcm2835.c:410:11: note: initialize the variable 'group' to silence this warning int group; ^ = 0 1 warning generated. vim +413 drivers/pinctrl/bcm/pinctrl-bcm2835.c 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 403 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 404 static void bcm2835_gpio_irq_handler(struct irq_desc *desc) 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 405 { 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 406 struct gpio_chip *chip = irq_desc_get_handler_data(desc); 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 407 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 408 struct irq_chip *host_chip = irq_desc_get_chip(desc); 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 409 int irq = irq_desc_get_irq(desc); 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 410 int group; 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 411 int i; 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 412 73345a18d464b1 drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2019-08-12 @413 for (i = 0; i < BCM2835_NUM_IRQS; i++) { 73345a18d464b1 drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2019-08-12 414 if (chip->irq.parents[i] == irq) { 0d885e9da176ad drivers/pinctrl/bcm/pinctrl-bcm2835.c Thierry Reding 2017-07-20 415 group = i; 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 416 break; 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 417 } 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 418 } 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 419 /* This should not happen, every IRQ has a bank */ 29d45a642d4ea8 drivers/pinctrl/bcm/pinctrl-bcm2835.c Jason Wang 2021-06-24 420 BUG_ON(i == BCM2835_NUM_IRQS); 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 421 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 422 chained_irq_enter(host_chip, desc); 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 423 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 424 switch (group) { 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 425 case 0: /* IRQ0 covers GPIOs 0-27 */ 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 426 bcm2835_gpio_irq_handle_bank(pc, 0, 0x0fffffff); 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 427 break; 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 428 case 1: /* IRQ1 covers GPIOs 28-45 */ 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 429 bcm2835_gpio_irq_handle_bank(pc, 0, 0xf0000000); 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 430 bcm2835_gpio_irq_handle_bank(pc, 1, 0x00003fff); 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 431 break; b1d84a3d0a26c5 drivers/pinctrl/bcm/pinctrl-bcm2835.c Stefan Wahren 2020-02-08 432 case 2: /* IRQ2 covers GPIOs 46-57 */ 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 433 bcm2835_gpio_irq_handle_bank(pc, 1, 0x003fc000); 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 434 break; 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 435 } 00445b5d5866c7 drivers/pinctrl/bcm/pinctrl-bcm2835.c Phil Elwell 2015-02-24 436 85ae9e512f437c drivers/pinctrl/bcm/pinctrl-bcm2835.c Linus Walleij 2016-11-14 437 chained_irq_exit(host_chip, desc); e1b2dc70cd5b00 drivers/pinctrl/pinctrl-bcm2835.c Simon Arlott 2012-09-27 438 } e1b2dc70cd5b00 drivers/pinctrl/pinctrl-bcm2835.c Simon Arlott 2012-09-27 439 :::::: The code at line 413 was first introduced by commit :::::: 73345a18d464b1b945b29f54f630ace6873344e2 pinctrl: bcm2835: Pass irqchip when adding gpiochip :::::: TO: Linus Walleij :::::: CC: Linus Walleij --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org