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-log-writes.c b/drivers/md/dm-log-writes.c
index 6d7436d2fd7f..f17a6cf2284e 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -937,19 +937,7 @@ static struct target_type log_writes_target = {
 	.dax_zero_page_range = log_writes_dax_zero_page_range,
 	.dax_recovery_write = log_writes_dax_recovery_write,
 };
-
-static int __init dm_log_writes_init(void)
-{
-	return dm_register_target(&log_writes_target);
-}
-
-static void __exit dm_log_writes_exit(void)
-{
-	dm_unregister_target(&log_writes_target);
-}
-
-module_init(dm_log_writes_init);
-module_exit(dm_log_writes_exit);
+module_dm(log_writes);
 
 MODULE_DESCRIPTION(DM_NAME " log writes target");
 MODULE_AUTHOR("Josef Bacik <jbacik@fb.com>");