linux-kernel - [PATCH] zpool: remove the list of pools

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Date:   Thu, 16 Dec 2021 00:41:57 +0800
From:   Zhaoyu Liu <zackary.liu.pro@...il.com>
To:     ddstreet@...e.org, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] zpool: remove the list of pools_head

The list of pools_head is no longer needed because the caller has been
deleted in commit 479305fd7172 ("zpool: remove zpool_evict()").

Signed-off-by: Zhaoyu Liu <zackary.liu.pro@...il.com>
---
 mm/zpool.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/mm/zpool.c b/mm/zpool.c
index 6d9ed48141e5..68facc193496 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -24,16 +24,11 @@ struct zpool {
 	const struct zpool_ops *ops;
 	bool evictable;
 	bool can_sleep_mapped;
-
-	struct list_head list;
 };
 
 static LIST_HEAD(drivers_head);
 static DEFINE_SPINLOCK(drivers_lock);
 
-static LIST_HEAD(pools_head);
-static DEFINE_SPINLOCK(pools_lock);
-
 /**
  * zpool_register_driver() - register a zpool implementation.
  * @driver:	driver to register
@@ -195,10 +190,6 @@ struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp,
 
 	pr_debug("created pool type %s\n", type);
 
-	spin_lock(&pools_lock);
-	list_add(&zpool->list, &pools_head);
-	spin_unlock(&pools_lock);
-
 	return zpool;
 }
 
@@ -217,9 +208,6 @@ void zpool_destroy_pool(struct zpool *zpool)
 {
 	pr_debug("destroying pool type %s\n", zpool->driver->type);
 
-	spin_lock(&pools_lock);
-	list_del(&zpool->list);
-	spin_unlock(&pools_lock);
 	zpool->driver->destroy(zpool->pool);
 	zpool_put_driver(zpool->driver);
 	kfree(zpool);
-- 
2.17.1