ARC_PERF_MAX_COUNTERS
unsigned long used_mask[BITS_TO_LONGS(ARC_PERF_MAX_COUNTERS)];
struct perf_event *act_counter[ARC_PERF_MAX_COUNTERS];
BUILD_BUG_ON(ARC_PERF_MAX_COUNTERS > 32);
if (WARN_ON(pct_bcr.c > ARC_PERF_MAX_COUNTERS))