perf intel-pt: Use evlist__add_dummy_on_all_cpus() for switch tracking

Use evlist__add_dummy_on_all_cpus() for switch tracking in preparation for
allowing system-wide events on all CPUs while the user requested events are
on only user requested CPUs.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20220524075436.29144-8-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/util/intel-pt.c

@@ -811,18 +811,11 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
 			if (!cpu_wide && perf_can_record_cpu_wide()) {
 				struct evsel *switch_evsel;
 
-				err = parse_events(evlist, "dummy:u", NULL);
-				if (err)
-					return err;
+				switch_evsel = evlist__add_dummy_on_all_cpus(evlist);
+				if (!switch_evsel)
+					return -ENOMEM;
 
-				switch_evsel = evlist__last(evlist);
-
-				switch_evsel->core.attr.freq = 0;
-				switch_evsel->core.attr.sample_period = 1;
 				switch_evsel->core.attr.context_switch = 1;
-
-				switch_evsel->core.system_wide = true;
-				switch_evsel->no_aux_samples = true;
 				switch_evsel->immediate = true;
 
 				evsel__set_sample_bit(switch_evsel, TID);