tree: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test head: 103bf32b0d2dd8b8a4d3d9ebdded5ba4e8263e6a commit: 88a293b28ae07acc86b09ebbe8715bcee412a63e [119/124] powerpc/64: use interrupt restart table to speed up return from interrupt config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-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/powerpc/linux.git/commit/... git remote add powerpc https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git git fetch --no-tags powerpc next-test git checkout 88a293b28ae07acc86b09ebbe8715bcee412a63e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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/interrupt.c:246:23: warning: no previous prototype for 'syscall_exit_prepare_main' [-Wmissing-prototypes] 246 | notrace unsigned long syscall_exit_prepare_main(unsigned long r3, | ^~~~~~~~~~~~~~~~~~~~~~~~~ 378 | notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~ 581 | notrace unsigned long interrupt_exit_user_restart(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ 601 | notrace unsigned long interrupt_exit_kernel_restart(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/syscall_exit_restart +378 arch/powerpc/kernel/interrupt.c 376 377 #ifdef CONFIG_PPC64 379 { 380 /* 381 * This is called when detecting a soft-pending interrupt as well as 382 * an alternate-return interrupt. So we can't just have the alternate 383 * return path clear SRR1[MSR] and set PACA_IRQ_HARD_DIS (unless 384 * the soft-pending case were to fix things up as well). RI might be 385 * disabled, in which case it gets re-enabled by __hard_irq_disable(). 386 */ 387 __hard_irq_disable(); 388 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; 389 390 trace_hardirqs_off(); 391 user_exit_irqoff(); 392 account_cpu_user_entry(); 393 394 BUG_ON(!user_mode(regs)); 395 396 regs->exit_result |= syscall_exit_prepare_main(r3, regs); 397 398 return regs->exit_result; 399 } 400 #endif 401 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org