Hi Hao,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.3-rc2 next-20230316]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Hao-Zhang/Coresight-Add-coresight-dummy-driver/20230316-112827
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20230316032005.6509-2-quic_hazha%40quicinc.com
patch subject: [PATCH v1 1/3] Coresight: Add coresight dummy driver
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20230316/202303161702.oIkvUip5-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/140cd28ed9031020826cfb5e62e80e28f7504895
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Hao-Zhang/Coresight-Add-coresight-dummy-driver/20230316-112827
        git checkout 140cd28ed9031020826cfb5e62e80e28f7504895
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/hwtracing/coresight/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot [off-list ref]
| Link: https://lore.kernel.org/oe-kbuild-all/202303161702.oIkvUip5-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

quoted

drivers/hwtracing/coresight/coresight-dummy.c:163:12: warning: no previous prototype for 'dummy_init' [-Wmissing-prototypes]

     163 | int __init dummy_init(void)
         |            ^~~~~~~~~~

quoted

drivers/hwtracing/coresight/coresight-dummy.c:169:13: warning: no previous prototype for 'dummy_exit' [-Wmissing-prototypes]

     169 | void __exit dummy_exit(void)
         |             ^~~~~~~~~~


vim +/dummy_init +163 drivers/hwtracing/coresight/coresight-dummy.c

   162	
 > 163	int __init dummy_init(void)
   164	{
   165		return platform_driver_register(&dummy_driver);
   166	}
   167	module_init(dummy_init);
   168	
 > 169	void __exit dummy_exit(void)
   170	{
   171		platform_driver_unregister(&dummy_driver);
   172	}
   173	module_exit(dummy_exit);
   174	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

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