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-rw-r--r--arch/arm/kernel/perf_event.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 93971b1..53c0304 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -96,6 +96,10 @@ armpmu_event_set_period(struct perf_event *event,
s64 period = hwc->sample_period;
int ret = 0;
+ /* The period may have been changed by PERF_EVENT_IOC_PERIOD */
+ if (unlikely(period != hwc->last_period))
+ left = period - (hwc->last_period - left);
+
if (unlikely(left <= -period)) {
left = period;
local64_set(&hwc->period_left, left);
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