Hi Dmitry, Thank you for the patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [also build test ERROR on ia64/next linus/master v5.6-rc6 next-20200316] [cannot apply to tip/x86/core] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Dmitry-Safonov/Add-log-level-to-... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: sparc-allyesconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=sparc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 2455 | void show_stack(struct task_struct *tsk, unsigned long *_ksp) | ^~~~~~~~~~ In file included from arch/sparc/kernel/traps_64.c:14: include/linux/sched/debug.h:33:13: note: previous declaration of 'show_stack' was here 33 | extern void show_stack(struct task_struct *task, unsigned long *sp, | ^~~~~~~~~~ vim +/show_stack +2455 arch/sparc/kernel/traps_64.c ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2454 ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 @2455 void show_stack(struct task_struct *tsk, unsigned long *_ksp) ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2456 { c6fee0810df4e0 arch/sparc/kernel/traps_64.c David S. Miller 2011-02-26 2457 unsigned long fp, ksp; c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2458 struct thread_info *tp; ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2459 int count = 0; 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2460 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2461 int graph = 0; 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2462 #endif ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2463 ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2464 ksp = (unsigned long) _ksp; c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2465 if (!tsk) c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2466 tsk = current; c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2467 tp = task_thread_info(tsk); c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2468 if (ksp == 0UL) { c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2469 if (tsk == current) c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2470 asm("mov %%fp, %0" : "=r" (ksp)); c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2471 else c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2472 ksp = tp->ksp; c1f193a7aed1b4 arch/sparc64/kernel/traps.c David S. Miller 2007-07-30 2473 } ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2474 if (tp == current_thread_info()) ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2475 flushw_all(); ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2476 ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2477 fp = ksp + STACK_BIAS; ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2478 4fe3ebec122f23 arch/sparc64/kernel/traps.c David S. Miller 2008-07-17 2479 printk("Call Trace:\n"); ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2480 do { 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2481 struct sparc_stackf *sf; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2482 struct pt_regs *regs; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2483 unsigned long pc; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2484 4f70f7a91bffdc arch/sparc64/kernel/traps.c David S. Miller 2008-08-12 2485 if (!kstack_valid(tp, fp)) ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2486 break; 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2487 sf = (struct sparc_stackf *) fp; 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2488 regs = (struct pt_regs *) (sf + 1); 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2489 4f70f7a91bffdc arch/sparc64/kernel/traps.c David S. Miller 2008-08-12 2490 if (kstack_is_trap_frame(tp, regs)) { 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2491 if (!(regs->tstate & TSTATE_PRIV)) 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2492 break; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2493 pc = regs->tpc; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2494 fp = regs->u_regs[UREG_I6] + STACK_BIAS; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2495 } else { 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2496 pc = sf->callers_pc; 14d2c68baa659c arch/sparc64/kernel/traps.c David S. Miller 2008-05-21 2497 fp = (unsigned long)sf->fp + STACK_BIAS; 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2498 } 77c664fa586240 arch/sparc64/kernel/traps.c David S. Miller 2008-04-24 2499 4fe3ebec122f23 arch/sparc64/kernel/traps.c David S. Miller 2008-07-17 2500 printk(" [%016lx] %pS\n", pc, (void *) pc); 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2501 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2502 if ((pc + 8UL) == (unsigned long) &return_to_handler) { 945626db0961d8 arch/sparc/kernel/traps_64.c Steven Rostedt (VMware 2018-12-07 2503) struct ftrace_ret_stack *ret_stack; 945626db0961d8 arch/sparc/kernel/traps_64.c Steven Rostedt (VMware 2018-12-07 2504) ret_stack = ftrace_graph_get_ret_stack(tsk, graph); 945626db0961d8 arch/sparc/kernel/traps_64.c Steven Rostedt (VMware 2018-12-07 2505) if (ret_stack) { 945626db0961d8 arch/sparc/kernel/traps_64.c Steven Rostedt (VMware 2018-12-07 2506) pc = ret_stack->ret; 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2507 printk(" [%016lx] %pS\n", pc, (void *) pc); 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2508 graph++; 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2509 } 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2510 } 667f0cee3e0321 arch/sparc/kernel/traps_64.c David S. Miller 2010-04-21 2511 #endif ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2512 } while (++count < 16); ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2513 } ^1da177e4c3f41 arch/sparc64/kernel/traps.c Linus Torvalds 2005-04-16 2514 :::::: The code at line 2455 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org