[linux-next:master 10338/10705] tools/testing/selftests/kselftest.h:427:13: error: implicit declaration of function 'vasprintf'; did you mean 'vsprintf'?

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

:::::: 
:::::: Manual check reason: "low confidence bisect report"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Chunyu Hu <chuhu@redhat.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   bd0f139e5fc11182777b81cefc3893ea508544ec
commit: cc0b04b10a7b98fd8df2fd539177e94e0f83a5c3 [10338/10705] selftests: ksft_exit_fail_perror: support printf style arguments
:::::: branch date: 34 hours ago
:::::: commit date: 3 days ago
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260403/202604030814.5B6AanyA-lkp@intel.com/config)
compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260403/202604030814.5B6AanyA-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/r/202604030814.5B6AanyA-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from za-fork.c:12:
   ../../kselftest.h: In function 'ksft_exit_fail_perror':
>> ../../kselftest.h:427:13: error: implicit declaration of function 'vasprintf'; did you mean 'vsprintf'? [-Wimplicit-function-declaration]
     427 |         if (vasprintf(&buf, msg, args) == -1) {
         |             ^~~~~~~~~
         |             vsprintf
--
   In file included from basic-gcs.c:16:
   tools/testing/selftests/kselftest.h: In function 'ksft_exit_fail_perror':
>> tools/testing/selftests/kselftest.h:427:13: error: implicit declaration of function 'vasprintf'; did you mean 'vsprintf'? [-Wimplicit-function-declaration]
     427 |         if (vasprintf(&buf, msg, args) == -1) {
         |             ^~~~~~~~~
         |             vsprintf


vim +427 tools/testing/selftests/kselftest.h

b6a4b66d845ae4 Paul Elder           2017-06-12  419  
cc0b04b10a7b98 Chunyu Hu            2026-03-30  420  static inline __noreturn __printf(1, 2) void ksft_exit_fail_perror(const char *msg, ...)
86483f8b4e8d3e Muhammad Usama Anjum 2024-04-04  421  {
cc0b04b10a7b98 Chunyu Hu            2026-03-30  422  	va_list args;
cc0b04b10a7b98 Chunyu Hu            2026-03-30  423  	char *buf = NULL;
cc0b04b10a7b98 Chunyu Hu            2026-03-30  424  	int saved_errno = errno;
cc0b04b10a7b98 Chunyu Hu            2026-03-30  425  
cc0b04b10a7b98 Chunyu Hu            2026-03-30  426  	va_start(args, msg);
cc0b04b10a7b98 Chunyu Hu            2026-03-30 @427  	if (vasprintf(&buf, msg, args) == -1) {
cc0b04b10a7b98 Chunyu Hu            2026-03-30  428  		va_end(args);
cc0b04b10a7b98 Chunyu Hu            2026-03-30  429  		ksft_exit_fail_msg("vasprintf failed: %s (%d)\n", strerror(saved_errno),
cc0b04b10a7b98 Chunyu Hu            2026-03-30  430  				saved_errno);
cc0b04b10a7b98 Chunyu Hu            2026-03-30  431  	}
cc0b04b10a7b98 Chunyu Hu            2026-03-30  432  	va_end(args);
cc0b04b10a7b98 Chunyu Hu            2026-03-30  433  
cc0b04b10a7b98 Chunyu Hu            2026-03-30  434  	errno = saved_errno;
cc0b04b10a7b98 Chunyu Hu            2026-03-30  435  	ksft_exit_fail_msg("%s: %s (%d)\n", buf, strerror(errno), errno);
cc0b04b10a7b98 Chunyu Hu            2026-03-30  436  
cc0b04b10a7b98 Chunyu Hu            2026-03-30  437  	free(buf);
86483f8b4e8d3e Muhammad Usama Anjum 2024-04-04  438  }
86483f8b4e8d3e Muhammad Usama Anjum 2024-04-04  439  

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