linux-kernel - Re: samples/ftrace/ftrace-direct-multi-modify.c:7:6: warning: no previous prototype for function 'my_direct

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Date:   Sat, 18 Dec 2021 23:58:56 +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>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: Re: samples/ftrace/ftrace-direct-multi-modify.c:7:6: warning: no
 previous prototype for function 'my_direct_func1'

On Sun, Dec 19, 2021 at 01:57:29AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   9eaa88c7036eda3f6c215f87ca693594cf90559b
> commit: e1067a07cfbc5a36abad3752fafe4c79e06db1bb ftrace/samples: Add module to test multi direct modify interface
> date:   9 days ago
> config: x86_64-randconfig-a001-20211219 (https://download.01.org/0day-ci/archive/20211219/202112190117.RKPcHQjE-lkp@intel.com/config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4c9e31a4814592bbda7153833e46728dc7b21100)
> 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/torvalds/linux.git/commit/?id=e1067a07cfbc5a36abad3752fafe4c79e06db1bb
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout e1067a07cfbc5a36abad3752fafe4c79e06db1bb
>         # 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=x86_64 SHELL=/bin/bash samples/ftrace/
> 
> 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-modify.c:7:6: warning: no previous prototype for function 'my_direct_func1' [-Wmissing-prototypes]
>    void my_direct_func1(unsigned long ip)
>         ^
>    samples/ftrace/ftrace-direct-multi-modify.c:7:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    void my_direct_func1(unsigned long ip)
>    ^
>    static 
> >> samples/ftrace/ftrace-direct-multi-modify.c:12:6: warning: no previous prototype for function 'my_direct_func2' [-Wmissing-prototypes]
>    void my_direct_func2(unsigned long ip)
>         ^
>    samples/ftrace/ftrace-direct-multi-modify.c:12:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    void my_direct_func2(unsigned long ip)
>    ^
>    static 
>    2 warnings generated.

ugh, not again.. of course :-\ will send the fix

thanks,
jirka

> 
> 
> vim +/my_direct_func1 +7 samples/ftrace/ftrace-direct-multi-modify.c
> 
>      6	
>    > 7	void my_direct_func1(unsigned long ip)
>      8	{
>      9		trace_printk("my direct func1 ip %lx\n", ip);
>     10	}
>     11	
>   > 12	void my_direct_func2(unsigned long ip)
>     13	{
>     14		trace_printk("my direct func2 ip %lx\n", ip);
>     15	}
>     16	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>