[PATCH v1 2/8] perf metric: Return early if no CPU PMU table exists

Ian Rogers
2022-08-30T16:49:31Z

Previous behavior is to segfault if there is no CPU PMU table and a
metric is sought. To reproduce compile with NO_JEVENTS=1 then request
a metric, for example, "perf stat -M IPC true".

Fixes: 00facc760903 ("perf jevents: Switch build to use jevents.py")
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/metricgroup.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index ad5cacdecd81..18aae040d61d 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1655,6 +1655,9 @@ int metricgroup__parse_groups(const struct option *opt,
struct evlist *perf_evlist = *(struct evlist **)opt->value;
const struct pmu_events_table *table = pmu_events_table__find();

+ if (!table)
+ return -EINVAL;
+
return parse_groups(perf_evlist, str, metric_no_group,
metric_no_merge, NULL, metric_events, table);
}
--
2.37.2.672.g94769d06f0-goog