tree:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
head:   83ef9bf841a2427c464cc3a9f5a6e57948a12963
commit: d67f3b96462922713e77cddb9d6f4965606918fc [870/956] drm/nouveau/fifo: tidy up non-stall intr handling
config: s390-allyesconfig
compiler: s390-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
        git remote add drm-tip git://anongit.freedesktop.org/drm/drm-tip
        git fetch --no-tags drm-tip drm-tip
        git checkout d67f3b96462922713e77cddb9d6f4965606918fc
        # 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=s390 SHELL=/bin/bash drivers/gpu/drm/

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/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:178:1: warning: no previous prototype for 'gf100_fifo_nonstall_block' [-Wmissing-prototypes]
     178 | gf100_fifo_nonstall_block(struct nvkm_event *event, int type, int index)
         | ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/gf100_fifo_nonstall_block +178 drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c

   176	
   177	void
 > 178	gf100_fifo_nonstall_block(struct nvkm_event *event, int type, int index)
   179	{
   180		struct nvkm_fifo *fifo = container_of(event, typeof(*fifo), nonstall.event);
   181		unsigned long flags;
   182	
   183		spin_lock_irqsave(&fifo->lock, flags);
   184		nvkm_mask(fifo->engine.subdev.device, 0x002140, 0x80000000, 0x00000000);
   185		spin_unlock_irqrestore(&fifo->lock, flags);
   186	}
   187	

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