dm: add helper macro for simple DM target module init and exit

Eliminate duplicate boilerplate code for simple modules that contain
a single DM target driver without any additional setup code.

Add a new module_dm() macro, which replaces the module_init() and
module_exit() with template functions that call dm_register_target()
and dm_unregister_target() respectively.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

1 files changed, 1 insertions, 13 deletions

diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c
index 884ac726a743..3b13e6eb1aa4 100644
--- a/drivers/md/dm-zero.c
+++ b/drivers/md/dm-zero.c
@@ -75,19 +75,7 @@ static struct target_type zero_target = {
 	.map    = zero_map,
 	.io_hints = zero_io_hints,
 };
-
-static int __init dm_zero_init(void)
-{
-	return dm_register_target(&zero_target);
-}
-
-static void __exit dm_zero_exit(void)
-{
-	dm_unregister_target(&zero_target);
-}
-
-module_init(dm_zero_init)
-module_exit(dm_zero_exit)
+module_dm(zero);
 
 MODULE_AUTHOR("Jana Saout <jana@saout.de>");
 MODULE_DESCRIPTION(DM_NAME " dummy target returning zeros");