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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Message-ID: <YZfc4wmvcQW9Kpcz@archlinux-ax161>
Date:   Fri, 19 Nov 2021 10:20:35 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     kernel test robot <lkp@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        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 10:33:36AM +0200, Andy Shevchenko wrote:
> 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?

I reported this upstream: https://bugs.llvm.org/show_bug.cgi?id=52559

Cheers,
Nathan