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

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Message-ID: <202112190117.RKPcHQjE-lkp@intel.com>
Date:   Sun, 19 Dec 2021 01:57:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...hat.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: samples/ftrace/ftrace-direct-multi-modify.c:7:6: warning: no
 previous prototype for function 'my_direct_func1'

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.


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