Setting the leader iterates the list, so rather than use idx (which
may be changed through list reordering) just count the elements and
set afterwards.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/lib/perf/evlist.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index 61b637f29b82..2d6121e89ccb 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -687,15 +687,14 @@ perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map,
 
 void __perf_evlist__set_leader(struct list_head *list, struct perf_evsel *leader)
 {
-	struct perf_evsel *first, *last, *evsel;
-
-	first = list_first_entry(list, struct perf_evsel, node);
-	last = list_last_entry(list, struct perf_evsel, node);
-
-	leader->nr_members = last->idx - first->idx + 1;
+	struct perf_evsel *evsel;
+	int n = 0;
 
-	__perf_evlist__for_each_entry(list, evsel)
+	__perf_evlist__for_each_entry(list, evsel) {
 		evsel->leader = leader;
+		n++;
+	}
+	leader->nr_members = n;
 }
 
 void perf_evlist__set_leader(struct perf_evlist *evlist)
-- 
2.40.0.rc0.216.gc4246ad0f0-goog

On 08/03/2023 08:17, Ian Rogers wrote:
> Setting the leader iterates the list, so rather than use idx (which
> may be changed through list reordering) just count the elements and
> set afterwards.
> 
> Signed-off-by: Ian Rogers<irogers@google.com>

Reviewed-by: John Garry <john.g.garry@oracle.com>