From: Yicong Yang <yangyicong@hisilicon.com> driver inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC0GTV ---------------------------------------------------------------------- If the selected CPU hisi_pmu::on_cpu goes offline, driver will select a new online CPU from hisi_pmu::associated_cpus, or if no online CPU found the PMU context won't be migrated. However for uncore PMUs the associated CPUs are just a peference and it also works to schedule the events on any online CPUs. So add a fallback to choose an online CPU if no associated CPUs found. Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> --- drivers/perf/hisilicon/hisi_uncore_pmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c index 475e31ecaaeb..8e35ea0a71b0 100644 --- a/drivers/perf/hisilicon/hisi_uncore_pmu.c +++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c @@ -518,6 +518,10 @@ int hisi_uncore_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) cpumask_and(&pmu_online_cpus, &hisi_pmu->associated_cpus, cpu_online_mask); target = cpumask_any_but(&pmu_online_cpus, cpu); + + if (target >= nr_cpu_ids) + target = cpumask_any_but(cpu_online_mask, cpu); + if (target >= nr_cpu_ids) return 0; -- 2.33.0