[kbuild-all] kernel/bpf/btf.c:5346:22: warning: function might be possible candidate for 'gnu_printf' format attribute

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dcc0b49040c70ad827a7f3d58a21b01fdb14e749 commit: 31d0bc81637d8d974a6dad9827b765b4b70c89d7 bpf: Move to generic BTF show support, apply it to seq files/strings date: 5 months ago config: x86_64-randconfig-a001-20200622 (attached as .config) compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 31d0bc81637d8d974a6dad9827b765b4b70c89d7 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel/bpf/btf.c: In function 'btf_seq_show': seq_vprintf((struct seq_file *)show->target, fmt, args); ^ kernel/bpf/btf.c: In function 'btf_snprintf_show': kernel/bpf/btf.c:5383:2: warning: function might be possible candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] len = vsnprintf(show->target, ssnprintf->len_left, fmt, args); ^ vim +/gnu_printf +5346 kernel/bpf/btf.c 5342 5343 static void btf_seq_show(struct btf_show *show, const char *fmt, 5344 va_list args) 5345 { 5347 } 5348 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org