[chao:feature/fs_param 1/1] fs/f2fs/super.c:191:1: warning: useless storage class specifier in empty declaration

[chao:feature/fs_param 1/1] fs/f2fs/super.c:191:1: warning: useless storage class specifier in empty declaration

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git feature/fs_param
head:   d4eac172f8f9f4594056366859b67e589e6124c3
commit: d4eac172f8f9f4594056366859b67e589e6124c3 [1/1] [WIP] f2fs: use new fs_context interface
config: arc-allmodconfig (https://download.01.org/0day-ci/archive/20240301/202403010309.aFEdK2Lb-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240301/202403010309.aFEdK2Lb-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/202403010309.aFEdK2Lb-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/f2fs/super.c:191:1: warning: useless storage class specifier in empty declaration
     191 | };
         | ^
   fs/f2fs/super.c: In function 'f2fs_fill_super':
>> fs/f2fs/super.c:3973:33: warning: unused variable 'ctx' [-Wunused-variable]
    3973 |         struct f2fs_fs_context *ctx = fc->fs_private;
         |                                 ^~~
   fs/f2fs/super.c: In function 'f2fs_parse_param':
>> fs/f2fs/super.c:888:20: warning: this statement may fall through [-Wimplicit-fallthrough=]
     888 |                 if (!f2fs_readonly(sbi->sb))
         |                    ^
   fs/f2fs/super.c:891:9: note: here
     891 |         case Opt_usrjquota:
         |         ^~~~
   fs/f2fs/super.c: At top level:
>> fs/f2fs/super.c:808:12: warning: 'f2fs_set_zstd_level' defined but not used [-Wunused-function]
     808 | static int f2fs_set_zstd_level(struct f2fs_sb_info *sbi, const char *str)
         |            ^~~~~~~~~~~~~~~~~~~
>> fs/f2fs/super.c:770:12: warning: 'f2fs_set_lz4hc_level' defined but not used [-Wunused-function]
     770 | static int f2fs_set_lz4hc_level(struct f2fs_sb_info *sbi, const char *str)
         |            ^~~~~~~~~~~~~~~~~~~~
>> fs/f2fs/super.c:709:13: warning: 'is_compress_extension_exist' defined but not used [-Wunused-function]
     709 | static bool is_compress_extension_exist(struct f2fs_sb_info *sbi,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +191 fs/f2fs/super.c

   186	
   187	static const struct mount_opts {
   188		int	token;
   189		int	opt;
   190		int	flags;
 > 191	};
   192	

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