libperf: Add perf_evlist__add() function

Add the perf_evlist__add() function to add a perf_evsel in a perf_evlist
struct.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-40-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/evlist.c

@@ -2,8 +2,15 @@
 #include <perf/evlist.h>
 #include <linux/list.h>
 #include <internal/evlist.h>
+#include <internal/evsel.h>
 
 void perf_evlist__init(struct perf_evlist *evlist)
 {
 	INIT_LIST_HEAD(&evlist->entries);
 }
+
+void perf_evlist__add(struct perf_evlist *evlist,
+		      struct perf_evsel *evsel)
+{
+	list_add_tail(&evsel->node, &evlist->entries);
+}

tools/perf/lib/include/perf/evlist.h

@@ -5,7 +5,10 @@
 #include <perf/core.h>
 
 struct perf_evlist;
+struct perf_evsel;
 
 LIBPERF_API void perf_evlist__init(struct perf_evlist *evlist);
+LIBPERF_API void perf_evlist__add(struct perf_evlist *evlist,
+				  struct perf_evsel *evsel);
 
 #endif /* __LIBPERF_EVLIST_H */

tools/perf/lib/libperf.map

@@ -11,6 +11,7 @@ LIBPERF_0.0.1 {
 		perf_thread_map__put;
 		perf_evsel__init;
 		perf_evlist__init;
+		perf_evlist__add;
 	local:
 		*;
 };

tools/perf/util/evlist.c

@@ -180,8 +180,8 @@ static void perf_evlist__propagate_maps(struct evlist *evlist)
 
 void evlist__add(struct evlist *evlist, struct evsel *entry)
 {
+	perf_evlist__add(&evlist->core, &entry->core);
 	entry->evlist = evlist;
-	list_add_tail(&entry->core.node, &evlist->core.entries);
 	entry->idx = evlist->nr_entries;
 	entry->tracking = !entry->idx;