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    SubjectRe: [PATCH V2 16/25] perf/x86: Register hybrid PMUs
    On Wed, Mar 10, 2021 at 08:37:52AM -0800, kan.liang@linux.intel.com wrote:
    > @@ -4420,6 +4513,27 @@ void intel_cpuc_finish(struct cpu_hw_events *cpuc)
    > static void intel_pmu_cpu_dead(int cpu)
    > {
    > intel_cpuc_finish(&per_cpu(cpu_hw_events, cpu));
    > +
    > + if (is_hybrid()) {
    > + struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu);
    > + struct x86_hybrid_pmu *hybrid_pmu = NULL;
    > + int i;
    > +
    > + for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) {
    > + if (cpumask_test_and_clear_cpu(cpu, &x86_pmu.hybrid_pmu[i].supported_cpus)) {
    > + hybrid_pmu = &x86_pmu.hybrid_pmu[i];
    > + break;
    > + }
    > + }
    > + if (WARN_ON_ONCE(!hybrid_pmu))
    > + return;
    > +
    > + cpuc->pmu = NULL;
    > + if (cpumask_empty(&hybrid_pmu->supported_cpus)) {
    > + perf_pmu_unregister(&hybrid_pmu->pmu);
    > + hybrid_pmu->pmu.type = -1;
    > + }
    > + }
    > }

    CPU_DEAD is the part of hotplug after we've disabled IRQs for the last
    time and before we kill ourselves, and you're trying to use mutexes
    again!

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