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-switch.c b/drivers/md/dm-switch.c
index 5a5976b0cfb8..dfd9fb52a6f3 100644
--- a/drivers/md/dm-switch.c
+++ b/drivers/md/dm-switch.c
@@ -565,19 +565,7 @@ static struct target_type switch_target = {
 	.prepare_ioctl = switch_prepare_ioctl,
 	.iterate_devices = switch_iterate_devices,
 };
-
-static int __init dm_switch_init(void)
-{
-	return dm_register_target(&switch_target);
-}
-
-static void __exit dm_switch_exit(void)
-{
-	dm_unregister_target(&switch_target);
-}
-
-module_init(dm_switch_init);
-module_exit(dm_switch_exit);
+module_dm(switch);
 
 MODULE_DESCRIPTION(DM_NAME " dynamic path switching target");
 MODULE_AUTHOR("Kevin D. O'Kelley <Kevin_OKelley@dell.com>");