lib/vsprintf.c:1528:9: warning: function 'va_format' might be a candidate for 'gnu_printf' format attribute

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   acc657692aed438e9931438f8c923b2b107aebf9
commit: 45c3e93d751ea50861c796da3cbfc848fa6ddf55 vsprintf: Factor out %pV handler as va_format()
date:   4 years, 9 months ago
config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20240111/202401111051.dDNWAfKw-lkp@xxxxxxxxx/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/20240111/202401111051.dDNWAfKw-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401111051.dDNWAfKw-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   lib/vsprintf.c:625:7: warning: no previous prototype for 'pointer_string' [-Wmissing-prototypes]
     625 | char *pointer_string(char *buf, char *end, const void *ptr,
         |       ^~~~~~~~~~~~~~
   lib/vsprintf.c: In function 'va_format':
>> lib/vsprintf.c:1528:9: warning: function 'va_format' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
    1528 |         buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
         |         ^~~


vim +1528 lib/vsprintf.c

  1522	
  1523	static char *va_format(char *buf, char *end, struct va_format *va_fmt)
  1524	{
  1525		va_list va;
  1526	
  1527		va_copy(va, *va_fmt->va);
> 1528		buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
  1529		va_end(va);
  1530	
  1531		return buf;
  1532	}
  1533	

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