tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 92477dd1faa650e50bd3bb35a6c0b8d09198cc35 commit: b031a684bfd01d633c79d281bd0cf11c2f834ada printk: remove logbuf_lock writer-protection of ringbuffer date: 10 months ago :::::: branch date: 6 days ago :::::: commit date: 10 months ago config: mips-randconfig-r012-20210927 (attached as .config) compiler: mips-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b031a684bfd01d633c79d281bd0cf11c2f834ada git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout b031a684bfd01d633c79d281bd0cf11c2f834ada # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): kernel/printk/printk.c: In function 'printk_sprint': >> kernel/printk/printk.c:1913:9: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 1913 | text_len = vscnprintf(text, size, fmt, args); | ^~~~~~~~ vim +1913 kernel/printk/printk.c b031a684bfd01d John Ogness 2020-12-09 1907 b031a684bfd01d John Ogness 2020-12-09 1908 static u16 printk_sprint(char *text, u16 size, int facility, enum log_flags *lflags, b031a684bfd01d John Ogness 2020-12-09 1909 const char *fmt, va_list args) b031a684bfd01d John Ogness 2020-12-09 1910 { b031a684bfd01d John Ogness 2020-12-09 1911 u16 text_len; b031a684bfd01d John Ogness 2020-12-09 1912 b031a684bfd01d John Ogness 2020-12-09 @1913 text_len = vscnprintf(text, size, fmt, args); b031a684bfd01d John Ogness 2020-12-09 1914 b031a684bfd01d John Ogness 2020-12-09 1915 /* Mark and strip a trailing newline. */ b031a684bfd01d John Ogness 2020-12-09 1916 if (text_len && text[text_len - 1] == '\n') { b031a684bfd01d John Ogness 2020-12-09 1917 text_len--; b031a684bfd01d John Ogness 2020-12-09 1918 *lflags |= LOG_NEWLINE; b031a684bfd01d John Ogness 2020-12-09 1919 } b031a684bfd01d John Ogness 2020-12-09 1920 b031a684bfd01d John Ogness 2020-12-09 1921 /* Strip log level and control flags. */ b031a684bfd01d John Ogness 2020-12-09 1922 if (facility == 0) { b031a684bfd01d John Ogness 2020-12-09 1923 u16 prefix_len; b031a684bfd01d John Ogness 2020-12-09 1924 b031a684bfd01d John Ogness 2020-12-09 1925 prefix_len = parse_prefix(text, NULL, NULL); b031a684bfd01d John Ogness 2020-12-09 1926 if (prefix_len) { b031a684bfd01d John Ogness 2020-12-09 1927 text_len -= prefix_len; b031a684bfd01d John Ogness 2020-12-09 1928 memmove(text, text + prefix_len, text_len); b031a684bfd01d John Ogness 2020-12-09 1929 } b031a684bfd01d John Ogness 2020-12-09 1930 } b031a684bfd01d John Ogness 2020-12-09 1931 b031a684bfd01d John Ogness 2020-12-09 1932 return text_len; b031a684bfd01d John Ogness 2020-12-09 1933 } b031a684bfd01d John Ogness 2020-12-09 1934 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org