Merge branch 'remove-qdisc-throttle'

Eric Dumazet says:

====================
net_sched: remove qdisc_is_throttled()

HTB, CBQ and HFSC pay a very high cost updating the qdisc 'throttled'
status that nothing but CBQ seems to use.

CBQ usage is flaky anyway, since no qdisc ->enqueue() updates the
'throttled' qdisc status.

This looks like some 'optimization' that actually cost more than code
without the optimization, and might cause latency issues with CBQ.

In my tests, I could achieve a 8 % performance increase in TCP_RR
workload through HTB qdisc, in presence of throttled classes,
and 5 % without throttled classes.
====================

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

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