perf hists browser: React to unassigned hotkey pressing

When that happens we were just ignoring the key press, now this
message is presented in the bottom line (the help line):

  "Press '?' for help on key bindings"

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-iyma2j5kj3q9i1stl4mfh90n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index e2b500b26527..c42adb600091 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1902,10 +1902,11 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
                 case CTRL('c'):
                         goto out_free_stack;
                 case 'f':
-                        if (is_report_browser(hbt))
-                                continue;
-                        goto out_free_stack;
+                        if (!is_report_browser(hbt))
+                                goto out_free_stack;
+                        /* Fall thru */
                 default:
+                        helpline = "Press '?' for help on key bindings";
                         continue;
                 }