Merge branch 'gro-minor-opts'

Merge branch 'gro-minor-opts'

Paolo Abeni says:

====================
gro: a couple of minor optimization

This series collects a couple of small optimizations for the GRO engine,
reducing slightly the number of cycles for dev_gro_receive().
The delta is within noise range in tput tests, but with big TCP coming
every cycle saved from the GRO engine will count - I hope ;)

v1 -> v2:
 - a few cleanup suggested from Alexander(s)
 - moved away the more controversial 3rd patch
====================

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