The cpumf_pmu_notfier() hotplug callback lacks handling of the CPU_DOWN_FAILED case. That means, if CPU_DOWN_PREPARE failes, the PMC of the CPU is not setup again.
Add handling for CPU_DOWN_FAILED transition to setup the PMC of the CPU. Cc: Martin Schwidefsky <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: [email protected] Signed-off-by: Anna-Maria Gleixner <[email protected]> --- arch/s390/kernel/perf_cpum_cf.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -670,6 +670,7 @@ static int cpumf_pmu_notifier(struct not switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: + case CPU_DOWN_FAILED: flags = PMC_INIT; smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1); break;
