open_softirq do?

[Robert Clove]

Hello All,

I am clear all that the softirq is a software interrupt :
Whenever a system call is about to return to the user space or h/w
interrupt exit,ant s/w interrupt which are marked pending are run.

Now in networking code i found

open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);

What does this do?

Thanks
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