fs/bcachefs/error.h:168:9: warning: function 'bch2_bkey_fsck_err' might be a candidate for 'gnu_printf' format attribute

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5e3f5b81de80c98338bcb47c233aebefee5a4801
commit: b65db750e2bb9252321fd54c284edd73c1595a09 bcachefs: Enumerate fsck errors
date:   5 weeks ago
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20231209/202312091128.LxOCXRoz-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231209/202312091128.LxOCXRoz-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/202312091128.LxOCXRoz-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/bcachefs/bcachefs.h:206,
                    from fs/bcachefs/acl.c:3:
   fs/bcachefs/bcachefs_format.h:215:25: warning: 'p' offset 3 in 'struct bkey' isn't aligned to 4 [-Wpacked-not-aligned]
     215 |         struct bpos     p;
         |                         ^
   fs/bcachefs/bcachefs_format.h:217:25: warning: 'version' offset 27 in 'struct bkey' isn't aligned to 4 [-Wpacked-not-aligned]
     217 |         struct bversion version;
         |                         ^~~~~~~
   In file included from fs/bcachefs/str_hash.h:8,
                    from fs/bcachefs/xattr.h:5,
                    from fs/bcachefs/acl.c:6:
   fs/bcachefs/error.h: In function 'bch2_bkey_fsck_err':
>> fs/bcachefs/error.h:168:9: warning: function 'bch2_bkey_fsck_err' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     168 |         prt_vprintf(err_msg, fmt, args);
         |         ^~~~~~~~~~~


vim +168 fs/bcachefs/error.h

   138	
   139	#define __fsck_err_on(cond, c, _flags, _err_type, ...)			\
   140		(unlikely(cond) ? __fsck_err(c, _flags, _err_type, __VA_ARGS__) : false)
   141	
   142	#define need_fsck_err_on(cond, c, _err_type, ...)				\
   143		__fsck_err_on(cond, c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, _err_type, __VA_ARGS__)
   144	
   145	#define need_fsck_err(c, _err_type, ...)				\
   146		__fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, _err_type, __VA_ARGS__)
   147	
   148	#define mustfix_fsck_err(c, _err_type, ...)				\
   149		__fsck_err(c, FSCK_CAN_FIX, _err_type, __VA_ARGS__)
   150	
   151	#define mustfix_fsck_err_on(cond, c, _err_type, ...)			\
   152		__fsck_err_on(cond, c, FSCK_CAN_FIX, _err_type, __VA_ARGS__)
   153	
   154	#define fsck_err(c, _err_type, ...)					\
   155		__fsck_err(c, FSCK_CAN_FIX|FSCK_CAN_IGNORE, _err_type, __VA_ARGS__)
   156	
   157	#define fsck_err_on(cond, c, _err_type, ...)				\
   158		__fsck_err_on(cond, c, FSCK_CAN_FIX|FSCK_CAN_IGNORE, _err_type, __VA_ARGS__)
   159	
   160	static inline void bch2_bkey_fsck_err(struct bch_fs *c,
   161					     struct printbuf *err_msg,
   162					     enum bch_sb_error_id err_type,
   163					     const char *fmt, ...)
   164	{
   165		va_list args;
   166	
   167		va_start(args, fmt);
 > 168		prt_vprintf(err_msg, fmt, args);
   169		va_end(args);
   170	

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