[PATCH] perf report: Do show usage message when failing to create cpu/thread maps

[Arnaldo Carvalho de Melo]

This is necessary to get rid of the browser dependency from
usage_with_options() and its friends.  Because we validate the targets
which are used to create the cpu/thread maps and inform the user about
any override performed via the chosen UI, we don't need to call the
usage routine for that.

Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-slu7lj7buzpwgop1vo9la8ma@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-top.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 7e2e72e6d9d1..4eb9c6906219 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1279,8 +1279,10 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (target__none(target))
 		target->system_wide = true;
 
-	if (perf_evlist__create_maps(top.evlist, target) < 0)
-		usage_with_options(top_usage, options);
+	if (perf_evlist__create_maps(top.evlist, target) < 0) {
+		ui__error("Not enough memory to create thread/cpu maps\n");
+		goto out_delete_evlist;
+	}
 
 	if (!top.evlist->nr_entries &&
 	    perf_evlist__add_default(top.evlist) < 0) {
-- 
1.8.3.1

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