Hi Huacai, kernel test robot noticed the following build warnings: [auto build test WARNING on linus/master] [also build test WARNING on v6.14-rc4 next-20250227] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Huacai-Chen/LoongArch-Use-polling-play_dead-when-resuming-from-hibernation/20250225-192024 base: linus/master patch link: https://lore.kernel.org/r/20250225111812.3065545-1-chenhuacai%40loongson.cn patch subject: [PATCH] LoongArch: Use polling play_dead() when resuming from hibernation config: loongarch-randconfig-001-20250227 (https://download.01.org/0day-ci/archive/20250228/202502280356.YjzMIJ8n-lkp@xxxxxxxxx/config) compiler: loongarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250228/202502280356.YjzMIJ8n-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202502280356.YjzMIJ8n-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> arch/loongarch/kernel/smp.c:451:24: warning: 'poll_play_dead' defined but not used [-Wunused-function] 451 | static void __noreturn poll_play_dead(void) | ^~~~~~~~~~~~~~ vim +/poll_play_dead +451 arch/loongarch/kernel/smp.c 450 > 451 static void __noreturn poll_play_dead(void) 452 { 453 register uint64_t addr; 454 register void (*init_fn)(void); 455 456 idle_task_exit(); 457 __this_cpu_write(cpu_state, CPU_DEAD); 458 459 __smp_mb(); 460 do { 461 __asm__ __volatile__("nop\n\t"); 462 addr = iocsr_read64(LOONGARCH_IOCSR_MBUF0); 463 } while (addr == 0); 464 465 init_fn = (void *)TO_CACHE(addr); 466 iocsr_write32(0xffffffff, LOONGARCH_IOCSR_IPI_CLEAR); 467 468 init_fn(); 469 BUG(); 470 } 471 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
