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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC PATCH 1/5] net: implement support for low latency socket
 polling
Date: Tue, 05 Mar 2013 14:55:24 -0500 (EST)
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From: Ben Hutchings <bhutchings@solarflare.com>
Date: Tue, 5 Mar 2013 16:43:01 +0000

> In general it appears to require a run-time check.  You might need to
> augment <asm/timex.h>.

On the other hand, unlike get_cycles, sched_clock() is always available.