tree: https://github.com/intel/linux-intel-lts.git 5.4/preempt-rt head: bb4ae19664a898236b2af46b45a6a0fea23ab20d commit: 7bc82c4f1b47c643468c3be1d9e0309d7c3e9b3f [3/13] Merge remote-tracking branch 'origin/5.4/yocto' into lts2019/yocto-rt config: microblaze-randconfig-r005-20210517 (attached as .config) compiler: microblaze-linux-gcc (GCC) 9.3.0 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://github.com/intel/linux-intel-lts/commit/7bc82c4f1b47c643468c3be1d... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/preempt-rt git checkout 7bc82c4f1b47c643468c3be1d9e0309d7c3e9b3f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=microblaze 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 >>): 1982 | int vprintk_default(const char *fmt, va_list args) | ^~~~~~~~~~~~~~~ kernel/printk/printk.c: In function 'vprintk_default': 1993 | r = vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args); | ^ kernel/printk/printk.c: In function 'vprintk_deferred': 2751 | return vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args); | ^~~~~~ vim +/vprintk_default +1982 kernel/printk/printk.c ^1da177e4c3f41 kernel/printk.c Linus Torvalds 2005-04-16 1981 a0cba2179ea4c1 kernel/printk/printk.c Linus Torvalds 2016-08-09 @1982 int vprintk_default(const char *fmt, va_list args) afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1983) { afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1984) int r; afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1985) afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1986) #ifdef CONFIG_KGDB_KDB 34aaff40b42148 kernel/printk/printk.c Petr Mladek 2016-12-14 1987 /* Allow to pass printk() to kdb but avoid a recursion. */ 34aaff40b42148 kernel/printk/printk.c Petr Mladek 2016-12-14 1988 if (unlikely(kdb_trap_printk && kdb_printf_cpu < 0)) { f7d4ca8bbfda23 kernel/printk/printk.c Daniel Thompson 2014-11-07 1989 r = vkdb_printf(KDB_MSGSRC_PRINTK, fmt, args); afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1990) return r; afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1991) } afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1992) #endif a0cba2179ea4c1 kernel/printk/printk.c Linus Torvalds 2016-08-09 @1993 r = vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args); afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1994) afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1995) return r; afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1996) } afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1997) EXPORT_SYMBOL_GPL(vprintk_default); afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat 2014-06-19 1998) :::::: The code at line 1982 was first introduced by commit :::::: a0cba2179ea4c1820fce2ee046b6ed90ecc56196 Revert "printk: create pr_<level> functions" :::::: TO: Linus Torvalds <torvalds(a)linux-foundation.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org