libperf: Add perf_evlist__remove() function

Adding perf_evlist__remove() function to remove a perf_evsel from
a perf_evlist struct.
Signed-off-by: NJiri 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/20190721112506.12306-41-jolsa@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/evlist.c

@@ -14,3 +14,9 @@ void perf_evlist__add(struct perf_evlist *evlist,
 {
 	list_add_tail(&evsel->node, &evlist->entries);
 }
+
+void perf_evlist__remove(struct perf_evlist *evlist,
+			 struct perf_evsel *evsel)
+{
+	list_del_init(&evsel->node);
+}

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

@@ -10,5 +10,7 @@ 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);
+LIBPERF_API void perf_evlist__remove(struct perf_evlist *evlist,
+				     struct perf_evsel *evsel);
 
 #endif /* __LIBPERF_EVLIST_H */

tools/perf/lib/libperf.map

@@ -12,6 +12,7 @@ LIBPERF_0.0.1 {
 		perf_evsel__init;
 		perf_evlist__init;
 		perf_evlist__add;
+		perf_evlist__remove;
 	local:
 		*;
 };

tools/perf/util/evlist.c

@@ -194,7 +194,7 @@ void evlist__add(struct evlist *evlist, struct evsel *entry)
 void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 {
 	evsel->evlist = NULL;
-	list_del_init(&evsel->core.node);
+	perf_evlist__remove(&evlist->core, &evsel->core);
 	evlist->nr_entries -= 1;
 }