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-rw-r--r--kernel/events/core.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3f07e6cfc1b6..dff00c787867 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3578,10 +3578,18 @@ static int perf_event_read(struct perf_event *event, bool group)
cpu_to_read = find_cpu_to_read(event, local_cpu);
put_cpu();
- ret = smp_call_function_single(cpu_to_read, __perf_event_read, &data, 1);
- /* The event must have been read from an online CPU: */
- WARN_ON_ONCE(ret);
- ret = ret ? : data.ret;
+ /*
+ * Purposely ignore the smp_call_function_single() return
+ * value.
+ *
+ * If event->oncpu isn't a valid CPU it means the event got
+ * scheduled out and that will have updated the event count.
+ *
+ * Therefore, either way, we'll have an up-to-date event count
+ * after this.
+ */
+ (void)smp_call_function_single(cpu_to_read, __perf_event_read, &data, 1);
+ ret = data.ret;
} else if (event->state == PERF_EVENT_STATE_INACTIVE) {
struct perf_event_context *ctx = event->ctx;
unsigned long flags;
@@ -6196,7 +6204,7 @@ static int __perf_pmu_output_stop(void *info)
{
struct perf_event *event = info;
struct pmu *pmu = event->pmu;
- struct perf_cpu_context *cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
struct remote_output ro = {
.rb = event->rb,
};