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由 Pavel Emelyanov 提交于
When the new pernet something (subsys, device or operations) is being registered, the init callback is to be called for each namespace, that currently exitst in the system. During the unregister, the same is to be done with the exit callback. However, not every pernet something has both calls, but the check for the appropriate pointer to be not NULL is performed inside the for_each_net() loop. This is (at least) strange, so tune this. Signed-off-by: NPavel Emelyanov <xemul@openvz.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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