perf hists browser: Do not exit on tab key with single event

TUI help states for multiple event sessions the TAB/UNTAB keys are used
to switch events. For single event sessions (e.g., the default) the tab
key currently causes the tui to exit. Change that to do nothing since
there is not no second event to switch to.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1319045867-12728-1-git-send-email-dsahern@gmail.com
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c
index 94e1ab0badb1122ca23048dec6506a2544573c90..d762875135258fe52d7408f7b6619c5b8ec21086 100644 (file)
--- a/tools/perf/util/ui/browsers/hists.c
+++ b/tools/perf/util/ui/browsers/hists.c
@@ -864,6 +864,8 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
                switch (key) {
                case NEWT_KEY_TAB:
                case NEWT_KEY_UNTAB:
+                       if (nr_events == 1)
+                               continue;
                        /*
                         * Exit the browser, let hists__browser_tree
                         * go to the next or previous