https://www.bilibili.com/video/BV1im411Q73m

bus_add_device 中 pr_debug 打开， 可以看到这些，workqueue 也是 bus ，只能说 bus 是一个通用概念

[    1.090460] bus: 'virtio': add device virtio0
[    1.094849] bus: 'virtio': add device virtio1
[    1.099812] bus: 'virtio': add device virtio2
[    1.104121] bus: 'virtio': add device virtio3
[    1.108670] bus: 'virtio': add device virtio4
[    1.112337] bus: 'virtio': add device virtio5
[    1.114722] bus: 'virtio': add device virtio6
[    1.119198] bus: 'virtio': add device virtio7
[    1.123044] bus: 'virtio': add device virtio8
[    3.405868] bus: 'workqueue': add device nvme-wq
[    3.406305] bus: 'workqueue': add device nvme-reset-wq
[    3.426116] bus: 'workqueue': add device nvme-delete-wq
[    3.721514] bus: 'workqueue': add device scsi_tmf_0
[    3.731699] bus: 'scsi': add device host0

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