Hi Yang, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: b5504db0db8375a77340b5bb54c17cfb75d3c754 commit: 9f05210dfee3a2319a61302f9bfd7317b522fa96 [1315/1315] arm64: perf: add pmu_nmi_enable to control pmu nmi support config: arm64-randconfig-002-20241128 (https://download.01.org/0day-ci/archive/20241128/202411282147.aYnkuR6v-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241128/202411282147.aYnkuR6v-lkp@i...) 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@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202411282147.aYnkuR6v-lkp@intel.com/ All errors (new ones prefixed by >>): arch/arm64/kernel/smp.c:840:6: warning: no previous prototype for 'arch_irq_work_raise' [-Wmissing-prototypes] 840 | void arch_irq_work_raise(void) | ^~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/smp.c:1053:5: warning: no previous prototype for 'setup_profiling_timer' [-Wmissing-prototypes] 1053 | int setup_profiling_timer(unsigned int multiplier) | ^~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/smp.c: In function 'hw_nmi_get_sample_period':

...

arch/arm64/kernel/smp.c:1124:14: error: 'pmu_nmi_enable' undeclared (first use in this function); did you mean 'perf_pmu_enable'? 1124 | if (!pmu_nmi_enable) | ^~~~~~~~~~~~~~ | perf_pmu_enable arch/arm64/kernel/smp.c:1124:14: note: each undeclared identifier is reported only once for each function it appears in In file included from include/linux/kernel.h:14, from include/linux/list.h:9, from include/linux/resource_ext.h:17, from include/linux/acpi.h:26, from arch/arm64/kernel/smp.c:20: arch/arm64/kernel/smp.c: In function '__cpu_up': include/linux/printk.h:346:9: warning: this statement may fall through [-Wimplicit-fallthrough=] 346 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/smp.c:169:25: note: in expansion of macro 'pr_crit' 169 | pr_crit("CPU%u: may not have shut down cleanly\n", cpu); | ^~~~~~~ arch/arm64/kernel/smp.c:170:17: note: here 170 | case CPU_STUCK_IN_KERNEL: | ^~~~ arch/arm64/kernel/smp.c: In function 'hw_nmi_get_sample_period': arch/arm64/kernel/smp.c:1128:1: warning: control reaches end of non-void function [-Wreturn-type] 1128 | } | ^

vim +1124 arch/arm64/kernel/smp.c 1121 1122 u64 hw_nmi_get_sample_period(int watchdog_thresh) 1123 {

1124 if (!pmu_nmi_enable)

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