linux-kernel - Re: [rostedt-trace:for-next 58/100] samples/ftrace/ftrace-direct-multi.c:8:6: warning: no previous prototype for function 'my_direct

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Message-ID: <YX/thIXtDzfhljX7@krava>
Date:   Mon, 1 Nov 2021 14:37:08 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: Re: [rostedt-trace:for-next 58/100]
 samples/ftrace/ftrace-direct-multi.c:8:6: warning: no previous prototype for
 function 'my_direct_func'

On Mon, Nov 01, 2021 at 05:46:26AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git for-next
> head:   93d76e4a0e0112b320c4f0e2a3930ad634628c58
> commit: 5fae941b9a6f95773df644e7cf304bf199707876 [58/100] ftrace/samples: Add multi direct interface test module
> config: x86_64-randconfig-r024-20211031 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 82ed106567063ea269c6d5669278b733e173a42f)
> 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
>         # https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/commit/?id=5fae941b9a6f95773df644e7cf304bf199707876
>         git remote add rostedt-trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
>         git fetch --no-tags rostedt-trace for-next
>         git checkout 5fae941b9a6f95773df644e7cf304bf199707876
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 
> 
> 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 >>):
> 
> >> samples/ftrace/ftrace-direct-multi.c:8:6: warning: no previous prototype for function 'my_direct_func' [-Wmissing-prototypes]
>    void my_direct_func(unsigned long ip)
>         ^
>    samples/ftrace/ftrace-direct-multi.c:8:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    void my_direct_func(unsigned long ip)

hum, that can actually be static.. I'll check

thanks,
jirka

>    ^
>    static 
>    1 warning generated.
> 
> 
> vim +/my_direct_func +8 samples/ftrace/ftrace-direct-multi.c
> 
>      7	
>    > 8	void my_direct_func(unsigned long ip)
>      9	{
>     10		trace_printk("ip %lx\n", ip);
>     11	}
>     12	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org