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virtio_fs: Remove redundant spinlock in virtio_fs_request_complete()
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@baidu.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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