linux-kernel - Re: [pinctrl-intel:review-andy 18/19] drivers/pinctrl/pinctrl-zynqmp.c:825:13: warning: variable 'pin' is uninitialized when used here

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Date:   Fri, 19 Nov 2021 10:33:36 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kernel test robot <lkp@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [pinctrl-intel:review-andy 18/19]
 drivers/pinctrl/pinctrl-zynqmp.c:825:13: warning: variable 'pin' is
 uninitialized when used here

On Fri, Nov 19, 2021 at 04:08:32PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/intel.git review-andy
> head:   c25441ca551164c56b34885df3d657e2ea4d623f
> commit: 9122cda6a325f80564f02b7899cc063009f5e1f9 [18/19] pinctrl: zynqmp: Unify pin naming
> config: arm64-buildonly-randconfig-r004-20211118 (attached as .config)
> 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 arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/intel.git/commit/?id=9122cda6a325f80564f02b7899cc063009f5e1f9
>         git remote add pinctrl-intel https://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/intel.git
>         git fetch --no-tags pinctrl-intel review-andy
>         git checkout 9122cda6a325f80564f02b7899cc063009f5e1f9
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/pinctrl/pinctrl-zynqmp.c:825:13: warning: variable 'pin' is uninitialized when used here [-Wuninitialized]
>            if (IS_ERR(pin->name))
>                       ^~~
>    drivers/pinctrl/pinctrl-zynqmp.c:811:37: note: initialize the variable 'pin' to silence this warning
>            struct pinctrl_pin_desc *pins, *pin;
>                                               ^
>                                                = NULL
>    1 warning generated.

Utterly inappropriate suggestion by the compiler (it found an actual error,
though).

Can be Clang fixed, really?

-- 
With Best Regards,
Andy Shevchenko