[bytedance:5.15-velinux 5521/23944] drivers/bytedance/blackholefs/file.c:28:15: warning: variable 'fname' set but not used

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/bytedance/kernel.git 5.15-velinux
head:   114077d3641f55e0727e810a4f1277a658f703b7
commit: 658231c84c81b024c130b724cf9f12e5b018528d [5521/23944] bytedance: driver: blackholefs: Add blackholefs driver
config: x86_64-bytedance-5.15-velinux (https://download.01.org/0day-ci/archive/20240830/202408301228.Wi06EmX1-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240830/202408301228.Wi06EmX1-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408301228.Wi06EmX1-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/bytedance/blackholefs/file.c: In function 'blackholefs_read':
>> drivers/bytedance/blackholefs/file.c:28:15: warning: variable 'fname' set but not used [-Wunused-but-set-variable]
      28 |         char *fname = "UNKNOWN";
         |               ^~~~~
   drivers/bytedance/blackholefs/file.c: In function 'blackholefs_write':
   drivers/bytedance/blackholefs/file.c:62:15: warning: variable 'fname' set but not used [-Wunused-but-set-variable]
      62 |         char *fname = "UNKNOWN";
         |               ^~~~~


vim +/fname +28 drivers/bytedance/blackholefs/file.c

    23	
    24	ssize_t blackholefs_read(struct file *f, char __user *ubuf, size_t s,
    25				loff_t *off)
    26	{
    27		loff_t read_size;
  > 28		char *fname = "UNKNOWN";
    29	
    30		TRACE();
    31		if (!f->f_inode) {
    32			ERROR();
    33			return 0;
    34		}
    35	
    36		if (f->f_path.dentry && f->f_path.dentry->d_name.name)
    37			fname = (char*)f->f_path.dentry->d_name.name;
    38	
    39		if (*off >= f->f_inode->i_size)
    40			return 0;
    41	
    42		DEBUG("[READ][%s] : f->f_pos = %lld, off = %lld, size = %ld, inode->i_size = %lld\n",
    43				fname, f->f_pos, *off, s, f->f_inode->i_size);
    44	
    45		if ((*off + s ) >= f->f_inode->i_size)
    46			read_size = f->f_inode->i_size - *off;
    47		else
    48			read_size = s;
    49	
    50		*off += read_size;
    51		if(clear_user(ubuf, s)) {
    52			ERROR();
    53		}
    54	
    55		return read_size;
    56	}
    57	

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https://github.com/intel/lkp-tests/wiki