perf report: Bail out if there are unrecognized options/arguments

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Documentation/perf_counter/builtin-report.c

@@ -1094,10 +1094,16 @@ int cmd_report(int argc, const char **argv, const char *prefix)
 
 	page_size = getpagesize();
 
-	parse_options(argc, argv, options, report_usage, 0);
+	argc = parse_options(argc, argv, options, report_usage, 0);
 
 	setup_sorting();
 
+	/*
+	 * Any (unrecognized) arguments left?
+	 */
+	if (argc)
+		usage_with_options(report_usage, options);
+
 	setup_pager();
 
 	return __cmd_report();