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由 Thomas Graf 提交于
The most common trigger of these errors is that the config option hasn't been enable wich would make the functionality available. Therefore returning EOPNOTSUPP gives a better idea on what is going wrong. Signed-off-by: NThomas Graf <tgraf@suug.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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