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Subject: [PATCH v8 06/17] mm: Refactoring in workingset_init()
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
To:     vdavydov.dev@gmail.com, shakeelb@google.com,
        viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org,
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        ktkhai@virtuozzo.com
Date:   Tue, 03 Jul 2018 18:09:36 +0300
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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>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Tested-by: Shakeel Butt <shakeelb@google.com>
---
 mm/workingset.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/mm/workingset.c b/mm/workingset.c
index a466e731231d..b16489c60471 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -507,16 +507,17 @@ 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);
 
-	/* list_lru lock nests inside the IRQ-safe i_pages lock */
-	ret = __list_lru_init(&shadow_nodes, true, true, &shadow_nodes_key);
+	ret = prealloc_shrinker(&workingset_shadow_shrinker);
 	if (ret)
 		goto err;
-	ret = register_shrinker(&workingset_shadow_shrinker);
+	/* list_lru lock nests inside the IRQ-safe i_pages lock */
+	ret = __list_lru_init(&shadow_nodes, true, 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;
 }