tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git pending-5.10 head: 929e0c4ef688344580bfb57a585b24b1d99a5064 commit: cdf962f344e1e3f76f392fce8eb84e2547842e62 [389/399] powerpc: handle kdump appropriately with crash_kexec_post_notifiers option config: powerpc-randconfig-r005-20220123 (https://download.01.org/0day-ci/archive/20220124/202201241635.seiM4ELp-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-stable pending-5.10 git checkout cdf962f344e1e3f76f392fce8eb84e2547842e62 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/ 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 >>): arch/powerpc/kernel/smp.c:551:6: warning: no previous prototype for function 'tick_broadcast' [-Wmissing-prototypes] void tick_broadcast(const struct cpumask *mask) ^ arch/powerpc/kernel/smp.c:551:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void tick_broadcast(const struct cpumask *mask) ^ static arch/powerpc/kernel/smp.c:561:6: warning: no previous prototype for function 'debugger_ipi_callback' [-Wmissing-prototypes] void debugger_ipi_callback(struct pt_regs *regs) ^ arch/powerpc/kernel/smp.c:561:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void debugger_ipi_callback(struct pt_regs *regs) ^ static void crash_smp_send_stop(void) ^ arch/powerpc/kernel/smp.c:611:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void crash_smp_send_stop(void) ^ static arch/powerpc/kernel/smp.c:1410:7: warning: variable 'ret' set but not used [-Wunused-but-set-variable] bool ret; ^ 4 warnings generated. vim +/crash_smp_send_stop +611 arch/powerpc/kernel/smp.c 559 560 #ifdef CONFIG_DEBUGGER 562 { 563 debugger_ipi(regs); 564 } 565 566 void smp_send_debugger_break(void) 567 { 568 smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, debugger_ipi_callback, 1000000); 569 } 570 #endif 571 572 #ifdef CONFIG_KEXEC_CORE 573 void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) 574 { 575 int cpu; 576 577 smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, crash_ipi_callback, 1000000); 578 if (kdump_in_progress() && crash_wake_offline) { 579 for_each_present_cpu(cpu) { 580 if (cpu_online(cpu)) 581 continue; 582 /* 583 * crash_ipi_callback will wait for 584 * all cpus, including offline CPUs. 585 * We don't care about nmi_ipi_function. 586 * Offline cpus will jump straight into 587 * crash_ipi_callback, we can skip the 588 * entire NMI dance and waiting for 589 * cpus to clear pending mask, etc. 590 */ 591 do_smp_send_nmi_ipi(cpu, false); 592 } 593 } 594 } 595 #endif 596 597 #ifdef CONFIG_NMI_IPI 598 static void crash_stop_this_cpu(struct pt_regs *regs) 599 #else 600 static void crash_stop_this_cpu(void *dummy) 601 #endif 602 { 603 /* 604 * Just busy wait here and avoid marking CPU as offline to ensure 605 * register data is captured appropriately. 606 */ 607 while (1) 608 cpu_relax(); 609 } 610 612 { 613 static bool stopped = false; 614 615 if (stopped) 616 return; 617 618 stopped = true; 619 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org