diff --git a/arch/x86/kernel/cpu/perf_event_intel_cqm.c b/arch/x86/kernel/cpu/perf_event_intel_cqm.c index 188076161c1b..63eb68b73589 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_cqm.c +++ b/arch/x86/kernel/cpu/perf_event_intel_cqm.c @@ -951,6 +951,14 @@ static u64 intel_cqm_event_count(struct perf_event *event) if (!cqm_group_leader(event)) return 0; + /* + * Getting up-to-date values requires an SMP IPI which is not + * possible if we're being called in interrupt context. Return + * the cached values instead. + */ + if (unlikely(in_interrupt())) + goto out; + /* * Notice that we don't perform the reading of an RMID * atomically, because we can't hold a spin lock across the