Merge branch 'napi_threaded_poll-enhancements'

Eric Dumazet says:

====================
net: give napi_threaded_poll() some love

There is interest to revert commit 4cd13c21b207
("softirq: Let ksoftirqd do its job") and use instead the
napi_threaded_poll() mode.

https://lore.kernel.org/netdev/140f61e2e1fcb8cf53619709046e312e343b53ca.camel@redhat.com/T/#m8a8f5b09844adba157ad0d22fc1233d97013de50

Before doing so, make sure napi_threaded_poll() benefits
from recent core stack improvements, to further reduce
softirq triggers.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>