From: ebiederm@xmission.com (Eric W. Biederman)
Date: Tue, 11 Mar 2014 01:43:10 -0700

Furthermore netpoll by it's design depends on the ability to receive
packets in netpoll_poll_dev.  It is a capability I don't think we have
ever used in the mainline kernel but it is a capability that is there
deliberately.  Which means if we want netpoll to not mess with the rx
path we need to change netpoll.

This breaks kdump, and any other users of netpoll_rx() et al.

Make the zero budget depend upon us being invoked from hardware
irq context, or something like that.

Thanks.