Hi Michael, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y head: 7281e11121f6fb47ea1e757b7781c5c15e3781fe commit: 57ac40ee09cea2ec90f71c6f49b15d0d82667b38 [2397/3689] powerpc: Drop -me200 addition to build flags config: powerpc64-randconfig-p001-20210318 (attached as .config) compiler: powerpc-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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.19.y git checkout 57ac40ee09cea2ec90f71c6f49b15d0d82667b38 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 18 | int pfn_is_nosave(unsigned long pfn) | ^~~~~~~~~~~~~ cc1: all warnings being treated as errors -- 445 | int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us, bool safe) | ^~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/smp.c:521:6: error: no previous prototype for 'tick_broadcast' [-Werror=missing-prototypes] 521 | void tick_broadcast(const struct cpumask *mask) | ^~~~~~~~~~~~~~ arch/powerpc/kernel/smp.c:531:6: error: no previous prototype for 'debugger_ipi_callback' [-Werror=missing-prototypes] 531 | void debugger_ipi_callback(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors -- 70 | unsigned long tlbcam_sz(int idx) | ^~~~~~~~~ arch/powerpc/mm/fsl_booke_mmu.c:269:21: error: no previous prototype for 'relocate_init' [-Werror=missing-prototypes] 269 | notrace void __init relocate_init(u64 dt_ptr, phys_addr_t start) | ^~~~~~~~~~~~~ cc1: all warnings being treated as errors -- In file included from arch/powerpc/xmon/xmon.c:67: arch/powerpc/xmon/dis-asm.h: In function 'print_insn_powerpc': 20 | printf("%.8x", insn); | ~~~^ ~~~~ | | | | | long unsigned int | unsigned int | %.8lx arch/powerpc/xmon/dis-asm.h: In function 'print_insn_spu': arch/powerpc/xmon/dis-asm.h:26:13: error: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'long unsigned int' [-Werror=format=] 26 | printf("%.8x", insn); | ~~~^ ~~~~ | | | | | long unsigned int | unsigned int | %.8lx arch/powerpc/xmon/xmon.c: In function 'xmon_print_symbol': arch/powerpc/xmon/xmon.c:3425:14: error: variable 'name' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered] 3425 | const char *name = NULL; | ^~~~ arch/powerpc/xmon/xmon.c: In function 'show_tasks': arch/powerpc/xmon/xmon.c:3107:22: error: variable 'tsk' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered] 3107 | struct task_struct *tsk = NULL; | ^~~ arch/powerpc/xmon/xmon.c: In function 'xmon_core': arch/powerpc/xmon/xmon.c:800:14: error: variable 'bp' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered] 800 | struct bpt *bp; | ^~ arch/powerpc/xmon/xmon.c:800:14: error: variable 'bp' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered] arch/powerpc/xmon/xmon.c:454:48: error: argument 'fromipi' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered] 454 | static int xmon_core(struct pt_regs *regs, int fromipi) | ~~~~^~~~~~~ cc1: all warnings being treated as errors Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for HOTPLUG_CPU Depends on SMP && (PPC_PSERIES || PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE Selected by - PM_SLEEP_SMP && SMP && (ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE && PM_SLEEP WARNING: unmet direct dependencies detected for FSL_EMB_PERFMON Depends on E500 || PPC_83xx Selected by - PPC_FSL_BOOK3E vim +/pfn_is_nosave +18 arch/powerpc/kernel/suspend.c 49c3df6aaa6a51 Vivek Goyal 2007-05-02 13 49c3df6aaa6a51 Vivek Goyal 2007-05-02 14 /* 49c3df6aaa6a51 Vivek Goyal 2007-05-02 15 * pfn_is_nosave - check if given pfn is in the 'nosave' section 49c3df6aaa6a51 Vivek Goyal 2007-05-02 16 */ 49c3df6aaa6a51 Vivek Goyal 2007-05-02 17 49c3df6aaa6a51 Vivek Goyal 2007-05-02 @18 int pfn_is_nosave(unsigned long pfn) :::::: The code at line 18 was first introduced by commit :::::: 49c3df6aaa6a51071fc135273d1a2515d019099f [PATCH] x86: Move swsusp __pa() dependent code to arch portion :::::: TO: Vivek Goyal <vgoyal(a)in.ibm.com&gt; :::::: CC: Andi Kleen <andi(a)basil.nowhere.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org