986 static u64 check_and_compute_delta(u64 prev, u64 val)  in check_and_compute_delta()  argument
988 	u64 delta = (val - prev) & 0xfffffffful;  in check_and_compute_delta()
999 	if (prev > val && (prev - val) < 256)  in check_and_compute_delta()
1007 	s64 val, delta, prev;  in power_pmu_read()  local
1027 		prev = local64_read(&event->hw.prev_count);  in power_pmu_read()
1030 		delta = check_and_compute_delta(prev, val);  in power_pmu_read()
1033 	} while (local64_cmpxchg(&event->hw.prev_count, prev, val) != prev);  in power_pmu_read()
1047 		prev = local64_read(&event->hw.period_left);  in power_pmu_read()
1048 		val = prev - delta;  in power_pmu_read()
1051 	} while (local64_cmpxchg(&event->hw.period_left, prev, val) != prev);  in power_pmu_read()
1069 	u64 val, prev, delta;  in freeze_limited_counters()  local
1077 		prev = local64_read(&event->hw.prev_count);  in freeze_limited_counters()
1079 		delta = check_and_compute_delta(prev, val);  in freeze_limited_counters()
1089 	u64 val, prev;  in thaw_limited_counters()  local
1096 		prev = local64_read(&event->hw.prev_count);  in thaw_limited_counters()
1097 		if (check_and_compute_delta(prev, val))  in thaw_limited_counters()
1932 	s64 prev, delta, left;  in record_and_restart()  local
1941 	prev = local64_read(&event->hw.prev_count);  in record_and_restart()
1942 	delta = check_and_compute_delta(prev, val);  in record_and_restart()