tree:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
head:   ebf3e327527d46b699c2ee4f56211701a05e6001
commit: 4d60100a23ec5b98e43277d82e5de53c359cf02c [885/957] drm/nouveau/fifo: add common channel recovery
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 4d60100a23ec5b98e43277d82e5de53c359cf02c
        # 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/runl.c:34:1: warning: no previous prototype for 'nvkm_engn_cgrp_get' [-Wmissing-prototypes]
      34 | nvkm_engn_cgrp_get(struct nvkm_engn *engn, unsigned long *pirqflags)
         | ^~~~~~~~~~~~~~~~~~


vim +/nvkm_engn_cgrp_get +34 drivers/gpu/drm/nouveau/nvkm/engine/fifo/runl.c

    32	
    33	struct nvkm_cgrp *
  > 34	nvkm_engn_cgrp_get(struct nvkm_engn *engn, unsigned long *pirqflags)
    35	{
    36		struct nvkm_cgrp *cgrp = NULL;
    37		struct nvkm_chan *chan;
    38		bool cgid;
    39		int id;
    40	
    41		id = engn->func->cxid(engn, &cgid);
    42		if (id < 0)
    43			return NULL;
    44	
    45		if (!cgid) {
    46			chan = nvkm_runl_chan_get_chid(engn->runl, id, pirqflags);
    47			if (chan)
    48				cgrp = chan->cgrp;
    49		} else {
    50			cgrp = nvkm_runl_cgrp_get_cgid(engn->runl, id, pirqflags);
    51		}
    52	
    53		WARN_ON(!cgrp);
    54		return cgrp;
    55	}
    56	

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