quoted

Moreover, your explanation is still insufficient. Even if
node_device_release() is empty function, we can get rid of the
warning.

I don't understand it. How can we get rid of the warning?

See cpu_device_release() for example.

quoted

Why do we need this node_device_release() implementation?

I think that this is a manner of releasing object related kobject.

No.  Usually we never call memset() from release callback.

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