[thomas-weissschuh:b4/rust-kunit-assertion 11/13] lib/kunit/string-stream.c:111:47: warning: diagnostic behavior may be improved by adding the 'format(printf, 2, 3)' attribute to the declaration of 'kunit_string_stream_add'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/rust-kunit-assertion
head:   f72cd14d37a9483b1e310e75dc9e583adb82a6d2
commit: 99770826688f8794d7f46b2d703adf3270ed8744 [11/13] prep: string stream
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20261004/202610042350.99INxpQ7-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261004/202610042350.99INxpQ7-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/202610042350.99INxpQ7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/kunit/string-stream.c:111:47: warning: diagnostic behavior may be improved by adding the 'format(printf, 2, 3)' attribute to the declaration of 'kunit_string_stream_add' [-Wmissing-format-attribute]
     111 |         result = string_stream_vadd(stream, fmt, args);
         |                                                      ^
   include/kunit/assert.h:232:5: note: 'kunit_string_stream_add' declared here
     232 | int kunit_string_stream_add(struct string_stream *stream, const char *fmt, ...);
         |     ^
   1 warning generated.


vim +111 lib/kunit/string-stream.c

   103	
   104	#if IS_ENABLED(CONFIG_RUST)
   105	int kunit_string_stream_add(struct string_stream *stream, const char *fmt, ...)
   106	{
   107		va_list args;
   108		int result;
   109	
   110		va_start(args, fmt);
 > 111		result = string_stream_vadd(stream, fmt, args);
   112		va_end(args);
   113	
   114		return result;
   115	}
   116	#endif
   117	

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