[tip:perf/core] perf buildid-cache: Show usage with incorrect params

[tip-bot for Masami Hiramatsu]

Commit-ID:  0497d0a8201a38f0c95edc8a1fc0325f2f879ddb
Gitweb:     http://git.kernel.org/tip/0497d0a8201a38f0c95edc8a1fc0325f2f879ddb
Author:     Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
AuthorDate: Fri, 27 Feb 2015 13:50:31 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 27 Feb 2015 15:52:40 -0300

perf buildid-cache: Show usage with incorrect params

Show usage if no action is specified or unexpected parameter is given.
In other words, be more user friendly.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Hemant Kumar <hemant@xxxxxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20150227045030.1999.44006.stgit@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-buildid-cache.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index 04466c4..d47a0cd 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -343,6 +343,11 @@ int cmd_buildid_cache(int argc, const char **argv,
 	argc = parse_options(argc, argv, buildid_cache_options,
 			     buildid_cache_usage, 0);
 
+	if (argc || (!add_name_list_str && !kcore_filename &&
+		     !remove_name_list_str && !purge_name_list_str &&
+		     !missing_filename && !update_name_list_str))
+		usage_with_options(buildid_cache_usage, buildid_cache_options);
+
 	if (missing_filename) {
 		file.path = missing_filename;
 		file.force = force;
--
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