perf evlist: Add thread_map__nr() helper
Introduce and use the thread_map__nr() function to protect a possible
NULL pointer dereference and cleanup the code a bit.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1362987798-24969-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/thread_map.h b/tools/perf/util/thread_map.h
index f718df8..0cd8b31 100644
--- a/tools/perf/util/thread_map.h
+++ b/tools/perf/util/thread_map.h
@@ -21,4 +21,9 @@
size_t thread_map__fprintf(struct thread_map *threads, FILE *fp);
+static inline int thread_map__nr(struct thread_map *threads)
+{
+ return threads ? threads->nr : 1;
+}
+
#endif /* __PERF_THREAD_MAP_H */