libperf: Add perf_evlist__read_format() function

Add the perf_evlist__read_format() function to libperf as internal
function.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-30-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/evlist.c

@@ -161,3 +161,10 @@ void perf_evlist__disable(struct perf_evlist *evlist)
 	perf_evlist__for_each_entry(evlist, evsel)
 		perf_evsel__disable(evsel);
 }
+
+u64 perf_evlist__read_format(struct perf_evlist *evlist)
+{
+	struct perf_evsel *first = perf_evlist__first(evlist);
+
+	return first->attr.read_format;
+}

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

@@ -66,4 +66,6 @@ static inline struct perf_evsel *perf_evlist__last(struct perf_evlist *evlist)
 	return list_entry(evlist->entries.prev, struct perf_evsel, node);
 }
 
+u64 perf_evlist__read_format(struct perf_evlist *evlist);
+
 #endif /* __LIBPERF_INTERNAL_EVLIST_H */

tools/perf/util/evlist.c

@@ -503,7 +503,7 @@ int perf_evlist__id_add_fd(struct evlist *evlist,
 	 * This way does not work with group format read, so bail
 	 * out in that case.
 	 */
-	if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
+	if (perf_evlist__read_format(&evlist->core) & PERF_FORMAT_GROUP)
 		return -1;
 
 	if (!(evsel->core.attr.read_format & PERF_FORMAT_ID) ||
@@ -1240,12 +1240,6 @@ bool perf_evlist__valid_read_format(struct evlist *evlist)
 	return true;
 }
 
-u64 perf_evlist__read_format(struct evlist *evlist)
-{
-	struct evsel *first = evlist__first(evlist);
-	return first->core.attr.read_format;
-}
-
 u16 perf_evlist__id_hdr_size(struct evlist *evlist)
 {
 	struct evsel *first = evlist__first(evlist);

tools/perf/util/evlist.h

@@ -217,7 +217,6 @@ int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel);
 void __perf_evlist__set_leader(struct list_head *list);
 void perf_evlist__set_leader(struct evlist *evlist);
 
-u64 perf_evlist__read_format(struct evlist *evlist);
 u64 __perf_evlist__combined_sample_type(struct evlist *evlist);
 u64 perf_evlist__combined_sample_type(struct evlist *evlist);
 u64 perf_evlist__combined_branch_type(struct evlist *evlist);