tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8ab774587903771821b59471cc723bba6d893942
commit: 4b296527549853eae8f1f0e010eaaea511ab00d7 drm/amdgpu: added synchronization for psp cmd buf access
date:   3 months ago
config: arc-randconfig-r043-20210927 (attached as .config)
compiler: arceb-elf-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b296527549853eae8f1f0e010eaaea511ab00d7
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4b296527549853eae8f1f0e010eaaea511ab00d7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c:503:6: warning: no previous prototype for 'release_psp_cmd_buf' [-Wmissing-prototypes]
     503 | void release_psp_cmd_buf(struct psp_context *psp)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/release_psp_cmd_buf +503 drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c

   502	
 > 503	void release_psp_cmd_buf(struct psp_context *psp)
   504	{
   505		mutex_unlock(&psp->mutex);
   506	}
   507	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org