Extern or forward variable declaration at tools/perf/util/hist.h, line 524 References: tools/perf/builtin-annotate.c, line 492 tools/perf/builtin-diff.c, line 201 tools/perf/builtin-diff.c, line 208 tools/perf/builtin-diff.c, line 215 tools/perf/builtin-diff.c, line 216 tools/perf/builtin-diff.c, line 217 tools/perf/builtin-diff.c, line 236 tools/perf/builtin-diff.c, line 946 tools/perf/builtin-report.c, line 913 tools/perf/builtin-report.c, line 931 tools/perf/builtin-report.c, line 968 tools/perf/builtin-report.c, line 986 tools/perf/builtin-report.c, line 996 tools/perf/builtin-report.c, line 1051 tools/perf/builtin-script.c, line 2516 tools/perf/builtin-script.c, line 2562 tools/perf/builtin-script.c, line 2871 tools/perf/builtin-script.c, line 3275 tools/perf/builtin-script.c, line 3285 tools/perf/builtin-script.c, line 3293 tools/perf/builtin-script.c, line 3303 tools/perf/builtin-script.c, line 3360 tools/perf/builtin-top.c, line 1303 tools/perf/builtin-top.c, line 1310 tools/perf/builtin-top.c, line 1344 tools/perf/builtin-top.c, line 1387 tools/perf/util/annotate.c, line 3081 tools/perf/util/hist.c, line 2638 tools/perf/util/hist.h, line 524 tools/perf/util/hist.h, line 525 tools/perf/util/sort.h, line 301