diff options
| -rw-r--r-- | arch/metag/kernel/perf/perf_event.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/metag/kernel/perf/perf_event.c b/arch/metag/kernel/perf/perf_event.c index 5bf984feaaa..6210126de78 100644 --- a/arch/metag/kernel/perf/perf_event.c +++ b/arch/metag/kernel/perf/perf_event.c @@ -214,6 +214,7 @@ again: delta = (new_raw_count - prev_raw_count) & MAX_PERIOD; local64_add(delta, &event->count); + local64_sub(delta, &hwc->period_left); } int metag_pmu_event_set_period(struct perf_event *event, @@ -223,6 +224,10 @@ int metag_pmu_event_set_period(struct perf_event *event, s64 period = hwc->sample_period; int ret = 0; + /* The period may have been changed */ + if (unlikely(period != hwc->last_period)) + left += period - hwc->last_period; + if (unlikely(left <= -period)) { left = period; local64_set(&hwc->period_left, left); |