sub_non_neg      1312 tools/perf/util/pmu.c 			used += snprintf(buf + used, sub_non_neg(len, used),
sub_non_neg      1317 tools/perf/util/pmu.c 	if (sub_non_neg(len, used) > 0) {
sub_non_neg      1321 tools/perf/util/pmu.c 	if (sub_non_neg(len, used) > 0) {