Extern or forward variable declaration at tools/perf/util/hist.h, line 554 References: tools/perf/builtin-annotate.c, line 492 tools/perf/builtin-diff.c, line 229 tools/perf/builtin-diff.c, line 236 tools/perf/builtin-diff.c, line 243 tools/perf/builtin-diff.c, line 244 tools/perf/builtin-diff.c, line 245 tools/perf/builtin-diff.c, line 264 tools/perf/builtin-diff.c, line 1260 tools/perf/builtin-report.c, line 1018 tools/perf/builtin-report.c, line 1036 tools/perf/builtin-report.c, line 1072 tools/perf/builtin-report.c, line 1090 tools/perf/builtin-report.c, line 1100 tools/perf/builtin-report.c, line 1180 tools/perf/builtin-script.c, line 2774 tools/perf/builtin-script.c, line 2822 tools/perf/builtin-script.c, line 3133 tools/perf/builtin-script.c, line 3187 tools/perf/builtin-script.c, line 3571 tools/perf/builtin-script.c, line 3581 tools/perf/builtin-script.c, line 3592 tools/perf/builtin-script.c, line 3603 tools/perf/builtin-script.c, line 3662 tools/perf/builtin-top.c, line 1360 tools/perf/builtin-top.c, line 1367 tools/perf/builtin-top.c, line 1401 tools/perf/builtin-top.c, line 1444 tools/perf/util/annotate.c, line 3190 tools/perf/util/hist.c, line 2785 tools/perf/util/hist.h, line 554 tools/perf/util/hist.h, line 555 tools/perf/util/sort.h, line 16 tools/perf/util/sort.h, line 307