Hi Daniel,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on 23a60a03d9a9980d1e91190491ceea0dc58fae62]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Rosenberg/FUSE-BPF-A-Stacked-Filesystem-Extension-for-FUSE/20221122-102157
base:   23a60a03d9a9980d1e91190491ceea0dc58fae62
patch link:    https://lore.kernel.org/r/20221122021536.1629178-5-drosen%40google.com
patch subject: [RFC PATCH v2 04/21] fuse: Add fuse-bpf, a stacked fs extension for FUSE
config: csky-randconfig-s032-20221123
compiler: csky-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/b04d4ace1fb3f54241df917462b995387a4c69cf
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Daniel-Rosenberg/FUSE-BPF-A-Stacked-Filesystem-Extension-for-FUSE/20221122-102157
        git checkout b04d4ace1fb3f54241df917462b995387a4c69cf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=csky SHELL=/bin/bash fs/

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

sparse warnings: (new ones prefixed by >>)
   fs/fuse/dir.c: note: in included file:
>> fs/fuse/fuse_i.h:92:48: sparse: sparse: Using plain integer as NULL pointer
   fs/fuse/fuse_i.h:92:61: sparse: sparse: Using plain integer as NULL pointer
--
>> fs/fuse/backing.c:351:24: sparse: sparse: Using plain integer as NULL pointer

vim +92 fs/fuse/fuse_i.h

    84	
    85	#ifdef CONFIG_FUSE_BPF
    86	static inline void get_fuse_backing_path(const struct dentry *d,
    87						  struct path *path)
    88	{
    89		struct fuse_dentry *di = get_fuse_dentry(d);
    90	
    91		if (!di) {
  > 92			*path = (struct path) { .mnt = 0, .dentry = 0 };
    93			return;
    94		}
    95	
    96		*path = di->backing_path;
    97		path_get(path);
    98	}
    99	#endif
   100	

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