linux-kernel - [PATCH v2] objtool: Print top level commands on incorrect usage

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Date:   Sat, 14 Oct 2017 20:17:54 +0530
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH v2] objtool: Print top level commands on incorrect usage

Print top-level objtool commands, along with the error on incorrect
command line usage. Objtool command line parser exit's with code 129,
for incorrect usage. Convert the cmd_usage() exit code also, to maintain
consistency across objtool.

After the patch:
$ ./objtool -j
Unknown option: -j

 usage: objtool COMMAND [ARGS]

 Commands:
   check   Perform stack metadata validation on an object file
   orc     Generate in-place ORC unwind tables for an object file

$ echo $?
129

Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
---
v2:
  - Changes to commit message only.

 tools/objtool/objtool.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index 31e0f91..07f3299 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -70,7 +70,7 @@ static void cmd_usage(void)
 
 	printf("\n");
 
-	exit(1);
+	exit(129);
 }
 
 static void handle_options(int *argc, const char ***argv)
@@ -86,9 +86,7 @@ static void handle_options(int *argc, const char ***argv)
 			break;
 		} else {
 			fprintf(stderr, "Unknown option: %s\n", cmd);
-			fprintf(stderr, "\n Usage: %s\n",
-				objtool_usage_string);
-			exit(1);
+			cmd_usage();
 		}
 
 		(*argv)++;
-- 
2.7.4