Extern or forward variable declaration at tools/perf/util/sort.h, line 278 References: tools/perf/builtin-diff.c, line 376 tools/perf/builtin-diff.c, line 388 tools/perf/builtin-diff.c, line 719 tools/perf/builtin-diff.c, line 729 tools/perf/builtin-kvm.c, line 746 tools/perf/builtin-kvm.c, line 1015 tools/perf/builtin-kvm.c, line 1288 tools/perf/builtin-kvm.c, line 1290 tools/perf/builtin-report.c, line 198 tools/perf/builtin-report.c, line 460 tools/perf/builtin-report.c, line 533 tools/perf/builtin-report.c, line 550 tools/perf/builtin-script.c, line 1509 tools/perf/builtin-script.c, line 1831 tools/perf/builtin-script.c, line 1834 tools/perf/builtin-script.c, line 2144 tools/perf/builtin-script.c, line 2992 tools/perf/builtin-stat.c, line 138 tools/perf/builtin-stat.c, line 1103 tools/perf/builtin-top.c, line 806 tools/perf/builtin-top.c, line 883 tools/perf/builtin-top.c, line 927 tools/perf/builtin-top.c, line 973 tools/perf/builtin-top.c, line 994 tools/perf/builtin-top.c, line 1071 tools/perf/util/hist.c, line 2444 tools/perf/util/intel-pt.c, line 2138 tools/perf/util/intel-pt.c, line 2154 tools/perf/util/intel-pt.c, line 2169 tools/perf/util/intel-pt.c, line 2319 tools/perf/util/intel-pt.c, line 2333 tools/perf/util/session.c, line 215 tools/perf/util/session.c, line 224 tools/perf/util/session.c, line 1016 tools/perf/util/session.c, line 1065 tools/perf/util/session.c, line 1178 tools/perf/util/session.c, line 1201 tools/perf/util/session.c, line 1222 tools/perf/util/session.c, line 1247 tools/perf/util/session.c, line 1417 tools/perf/util/session.c, line 1495 tools/perf/util/session.c, line 2140 tools/perf/util/session.c, line 2176 tools/perf/util/sort.c, line 2215 tools/perf/util/sort.c, line 2286 tools/perf/util/sort.c, line 2303 tools/perf/util/sort.c, line 2325 tools/perf/util/sort.c, line 2469 tools/perf/util/sort.c, line 2565 tools/perf/util/sort.c, line 2611 tools/perf/util/sort.c, line 2645 tools/perf/util/sort.c, line 2706 tools/perf/util/sort.c, line 2959 tools/perf/util/sort.h, line 278 tools/perf/util/sort.h, line 280 tools/perf/util/sort.h, line 293 tools/perf/util/top.h, line 12 tools/perf/util/top.h, line 18