perf tools: Make the tool's warning messages optional

I want to display the pure events status coming in the next patch and
the tool's warnings are superfluous in the output. Making it optional,
enabled by default.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-11-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 54e30f1bcbd7..8d0fa2f8da16 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1773,7 +1773,8 @@ done:
         err = perf_session__flush_thread_stacks(session);
 out_err:
         free(buf);
-        perf_session__warn_about_errors(session);
+        if (!tool->no_warn)
+                perf_session__warn_about_errors(session);
         ordered_events__free(&session->ordered_events);
         auxtrace__free_events(session);
         return err;
@@ -1929,7 +1930,8 @@ out:
         err = perf_session__flush_thread_stacks(session);
 out_err:
         ui_progress__finish();
-        perf_session__warn_about_errors(session);
+        if (!tool->no_warn)
+                perf_session__warn_about_errors(session);
         /*
          * We may switching perf.data output, make ordered_events
          * reusable.
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 2532b558099b..183c91453522 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -76,6 +76,7 @@ struct perf_tool {
         bool            ordered_events;
         bool            ordering_requires_timestamps;
         bool            namespace_events;
+        bool            no_warn;
         enum show_feature_header show_feat_hdr;
 };