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From:   YueHaibing <yuehaibing@huawei.com>
To:     <viro@zeniv.linux.org.uk>, <axboe@kernel.dk>
CC:     <linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH -next] io-wq: using kfree_rcu() to simplify the code
Date:   Sat, 2 Nov 2019 15:55:01 +0800
Message-ID: <20191102075501.38972-1-yuehaibing@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The callback function of call_rcu() just calls a kfree(),
so can use kfree_rcu() instead of call_rcu() + callback function.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 fs/io-wq.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 652b8ba..3bbab2c 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -102,13 +102,6 @@ struct io_wq {
 	struct completion done;
 };
 
-static void io_wq_free_worker(struct rcu_head *head)
-{
-	struct io_worker *worker = container_of(head, struct io_worker, rcu);
-
-	kfree(worker);
-}
-
 static bool io_worker_get(struct io_worker *worker)
 {
 	return refcount_inc_not_zero(&worker->ref);
@@ -194,7 +187,7 @@ static void io_worker_exit(struct io_worker *worker)
 	if (all_done && refcount_dec_and_test(&wqe->wq->refs))
 		complete(&wqe->wq->done);
 
-	call_rcu(&worker->rcu, io_wq_free_worker);
+	kfree_rcu(worker, rcu);
 }
 
 static void io_worker_start(struct io_wqe *wqe, struct io_worker *worker)
-- 
2.7.4