linux-kernel - [PATCH] virtio_fs: Remove redundant spinlock in virtio_fs_request

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Message-ID: <20250613055051.1873-1-lirongqing@baidu.com>
Date: Fri, 13 Jun 2025 13:50:51 +0800
From: lirongqing <lirongqing@...du.com>
To: <vgoyal@...hat.com>, <stefanha@...hat.com>, <miklos@...redi.hu>,
	<eperezma@...hat.com>, <virtualization@...ts.linux.dev>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Li RongQing <lirongqing@...du.com>
Subject: [PATCH] virtio_fs: Remove redundant spinlock in virtio_fs_request_complete()

From: Li RongQing <lirongqing@...du.com>

Since clear_bit is an atomic operation, the spinlock is redundant and
can be removed, reducing lock contention is good for performance.

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 fs/fuse/virtio_fs.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 8f2e2f3..de34179 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -791,9 +791,7 @@ static void virtio_fs_request_complete(struct fuse_req *req,
 		}
 	}
 
-	spin_lock(&fpq->lock);
 	clear_bit(FR_SENT, &req->flags);
-	spin_unlock(&fpq->lock);
 
 	fuse_request_end(req);
 	spin_lock(&fsvq->lock);
-- 
2.9.4