[PATCH V4 10/15] perf evsel: expose perf_missing_features.write_backward

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxx>

perf top need it to handle overwrite fallback later.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
---
 tools/perf/util/evsel.c | 5 +++++
 tools/perf/util/evsel.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 4eea3b4..1dd3700 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1670,6 +1670,11 @@ static bool ignore_missing_thread(struct perf_evsel *evsel,
 	return true;
 }
 
+bool is_write_backward_fail(void)
+{
+	return perf_missing_features.write_backward;
+}
+
 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 		     struct thread_map *threads)
 {
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 846e416..1f46728 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -448,4 +448,6 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 
 struct perf_env *perf_evsel__env(struct perf_evsel *evsel);
 
+bool is_write_backward_fail(void);
+
 #endif /* __PERF_EVSEL_H */
-- 
2.5.5