[PATCH 2/3] perf stat: Don't require a workload when using system wide or CPU options

[David Ahern]

perf-stat can do system wide counters or one or more cpus. For
these options do not require a workload to be specified.

Signed-off-by: David Ahern <dsahern@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung.kim@xxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
---
 tools/perf/builtin-stat.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 6cc0aa2..60239fe 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1517,8 +1517,10 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 	} else if (big_num_opt == 0) /* User passed --no-big-num */
 		big_num = false;
 
-	if (!argc && !perf_target__has_task(&target))
+	if (!argc && !perf_target__has_task(&target) &&
+	    !perf_target__has_cpu(&target))
 		usage_with_options(stat_usage, options);
+
 	if (run_count < 0) {
 		usage_with_options(stat_usage, options);
 	} else if (run_count == 0) {
-- 
1.7.10.1

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