[PATCH v4 04/13] mm: Refactoring in workingset_init()

[Kirill Tkhai <ktkhai@virtuozzo.com>]

Use prealloc_shrinker()/register_shrinker_prepared()
instead of register_shrinker(). This will be used
in next patch.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
 mm/workingset.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/workingset.c b/mm/workingset.c
index 40ee02c83978..c3a4fe145bb7 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -528,15 +528,16 @@ static int __init workingset_init(void)
 	pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
 	       timestamp_bits, max_order, bucket_order);
 
-	ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key);
+	ret = prealloc_shrinker(&workingset_shadow_shrinker);
 	if (ret)
 		goto err;
-	ret = register_shrinker(&workingset_shadow_shrinker);
+	ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key);
 	if (ret)
 		goto err_list_lru;
+	register_shrinker_prepared(&workingset_shadow_shrinker);
 	return 0;
 err_list_lru:
-	list_lru_destroy(&shadow_nodes);
+	free_prealloced_shrinker(&workingset_shadow_shrinker);
 err:
 	return ret;
 }