Extern or forward variable declaration at tools/perf/util/hist.h, line 295 References: tools/perf/builtin-diff.c, line 373 tools/perf/builtin-diff.c, line 385 tools/perf/builtin-diff.c, line 690 tools/perf/builtin-diff.c, line 700 tools/perf/builtin-report.c, line 317 tools/perf/builtin-report.c, line 382 tools/perf/builtin-report.c, line 399 tools/perf/builtin-script.c, line 629 tools/perf/builtin-script.c, line 632 tools/perf/builtin-top.c, line 888 tools/perf/util/hist.c, line 1418 tools/perf/util/hist.h, line 140 tools/perf/util/hist.h, line 295 tools/perf/util/hist.h, line 311 tools/perf/util/hist.h, line 318 tools/perf/util/session.c, line 215 tools/perf/util/session.c, line 835 tools/perf/util/session.c, line 884 tools/perf/util/session.c, line 971 tools/perf/util/session.c, line 994 tools/perf/util/session.c, line 1015 tools/perf/util/session.c, line 1040 tools/perf/util/session.c, line 1174 tools/perf/util/session.c, line 1252 tools/perf/util/session.c, line 1956 tools/perf/util/session.c, line 1992