Extern or forward variable declaration at tools/perf/perf.h, line 35 References: tools/perf/builtin-diff.c, line 1234 tools/perf/builtin-kvm.c, line 1532 tools/perf/builtin-kvm.c, line 1555 tools/perf/builtin-kvm.c, line 1563 tools/perf/builtin-record.c, line 606 tools/perf/builtin-top.c, line 714 tools/perf/perf.h, line 35 tools/perf/util/callchain.c, line 724 tools/perf/util/event.c, line 923 tools/perf/util/event.c, line 927 tools/perf/util/event.c, line 935 tools/perf/util/session.c, line 977 tools/perf/util/top.c, line 41 tools/perf/util/util.c, line 35 tools/perf/util/util.c, line 44 tools/perf/util/util.c, line 662 tools/perf/util/util.c, line 664