From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 21 Feb 2013 22:51:40 +0000 (+0000)
Subject: timekeeping: Shorten seq_count region
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~116^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca4523cda429712fc135c5db50920d90eb776a6c;p=pandora-kernel.git

timekeeping: Shorten seq_count region

Shorten the seqcount write hold region to the actual update of the
timekeeper and the related data (e.g vsyscall).

On a contemporary x86 system this reduces the maximum latencies on
Preempt-RT from 8us to 4us on the non-timekeeping cores.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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