perf report: Fix stdio event name header printing

In the past we tried to avoid printing the name of the event when just
one event was found in the perf.data file, after some refactorings it
ended up not printing the event name if just one hist_entry was found in
one of the events.

Fix it by always printing the name of the event, even if just one is
found.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-kikr0c7ou55bd9caok8569rf@git.kernel.org
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index a0673eeeae8d060060983a8c92fa58739a7e8b42..3d58334909a5eadc6f69710da39868c5a87ad2d3 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -229,10 +229,7 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
 
        list_for_each_entry(pos, &evlist->entries, node) {
                struct hists *hists = &pos->hists;
-               const char *evname = NULL;
-
-               if (rb_first(&hists->entries) != rb_last(&hists->entries))
-                       evname = event_name(pos);
+               const char *evname = event_name(pos);
 
                hists__fprintf_nr_sample_events(hists, evname, stdout);
                hists__fprintf(hists, NULL, false, stdout);