Hi Junhao,

I love your patch! Perhaps something to improve:

[auto build test WARNING on soc/for-next]
[also build test WARNING on linus/master v6.1-rc4 next-20221111]
[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/Junhao-He/Add-support-for-UltraSoc-System-Memory-Buffer/20221109-215158
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
patch link:    https://lore.kernel.org/r/20221109135008.9485-2-hejunhao3%40huawei.com
patch subject: [PATCH v12 1/2] drivers/coresight: Add UltraSoc System Memory Buffer driver
config: arm64-randconfig-r023-20221111
compiler: aarch64-linux-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/49ede03fd874b65deca5382ea84c3377188136da
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Junhao-He/Add-support-for-UltraSoc-System-Memory-Buffer/20221109-215158
        git checkout 49ede03fd874b65deca5382ea84c3377188136da
        # 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=arm64 SHELL=/bin/bash drivers/hwtracing/coresight/

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 >>):

   drivers/hwtracing/coresight/ultrasoc-smb.c: In function 'smb_config_inport':
>> drivers/hwtracing/coresight/ultrasoc-smb.c:553:31: warning: suggest braces around empty body in an 'else' statement [-Wempty-body]
     553 |                 ACPI_FREE(obj);
         |                               ^
   drivers/hwtracing/coresight/ultrasoc-smb.c: At top level:
   drivers/hwtracing/coresight/ultrasoc-smb.c:615:36: warning: 'ultrasoc_smb_acpi_match' defined but not used [-Wunused-const-variable=]
     615 | static const struct acpi_device_id ultrasoc_smb_acpi_match[] = {
         |                                    ^~~~~~~~~~~~~~~~~~~~~~~


vim +/else +553 drivers/hwtracing/coresight/ultrasoc-smb.c

   532	
   533	static int smb_config_inport(struct device *dev, bool enable)
   534	{
   535		u64 func = enable ? 1 : 0;
   536		union acpi_object *obj;
   537		guid_t guid;
   538		u64 rev = 0;
   539	
   540		/*
   541		 * Using DSM calls to enable/disable ultrasoc hardwares on
   542		 * tracing path, to prevent ultrasoc packet format being exposed.
   543		 */
   544		if (guid_parse(ULTRASOC_SMB_DSM_UUID, &guid)) {
   545			dev_err(dev, "Get GUID failed\n");
   546			return -EINVAL;
   547		}
   548	
   549		obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, rev, func, NULL);
   550		if (!obj)
   551			dev_err(dev, "ACPI handle failed\n");
   552		else
 > 553			ACPI_FREE(obj);
   554	
   555		return 0;
   556	}
   557	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp