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Date:   Fri, 09 Sep 2022 08:30:37 +0200
From:   "Arnd Bergmann" <arnd@arndb.de>
To:     "kernel test robot" <lkp@intel.com>,
        "Qi Zheng" <zhengqi.arch@bytedance.com>
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        "Ammar Faizi" <ammarfaizi2@gnuweeb.org>,
        "GNU/Weeb Mailing List" <gwml@vger.gnuweeb.org>,
        linux-kernel@vger.kernel.org,
        "Catalin Marinas" <catalin.marinas@arm.com>
Subject: Re: [ammarfaizi2-block:arm64/linux/for-next/misc 2/2]
 arch/arm64/kernel/irq.c:81:6: warning: no previous prototype for function
 'do_softirq_own_stack'
Content-Type: text/plain
Precedence: bulk

On Fri, Sep 9, 2022, at 5:12 AM, kernel test robot wrote:
> tree:   https://github.com/ammarfaizi2/linux-block 
> arm64/linux/for-next/misc
> head:   2d2f3bb897a3de4190b1b6b296c3429d01327554
> commit: 2d2f3bb897a3de4190b1b6b296c3429d01327554 [2/2] arm64: run 
> softirqs on the per-CPU IRQ stack
> config: arm64-randconfig-r023-20220907
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 
> 1546df49f5a6d09df78f569e4137ddb365a3e827)
> 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://github.com/ammarfaizi2/linux-block/commit/2d2f3bb897a3de4190b1b6b296c3429d01327554
>         git remote add ammarfaizi2-block 
> https://github.com/ammarfaizi2/linux-block
>         git fetch --no-tags ammarfaizi2-block arm64/linux/for-next/misc
>         git checkout 2d2f3bb897a3de4190b1b6b296c3429d01327554
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 
> O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
>>> arch/arm64/kernel/irq.c:81:6: warning: no previous prototype for function 'do_softirq_own_stack' [-Wmissing-prototypes]
>    void do_softirq_own_stack(void)
>         ^
>    arch/arm64/kernel/irq.c:81:1: note: declare 'static' if the function 
> is not intended to be used outside of this translation unit
>    void do_softirq_own_stack(void)
>    ^
>    static 


I think we are missing an "#include <asm/softirq_stack.h>"
in arch/arm64/kernel/irq.c

       Arnd