netdev - static_branch() for netpoll?

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Message-ID: <20120426162241.4cbd2b33@nehalam.linuxnetplumber.net>
Date:	Thu, 26 Apr 2012 16:22:41 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: static_branch() for netpoll?

It would be good to use static_branch instead of the current logic used
to detect if traffic trapping is need for netpoll. Most distro's end up
enabling NETPOLL, yet most users never need it.  Not sure about the locking
requirements since netpoll_rx() runs in both hard and soft irq context.
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