From: Feng Tang <feng.tang@intel.com>
Date: Tue, 15 Jan 2013 16:09:47 +0000 (+0800)
Subject: timekeeping: Add persistent_clock_exist flag
X-Git-Tag: v3.9-rc1~170^2~5^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=31ade30692dc9680bfc95700d794818fa3f754ac;p=pandora-kernel.git

timekeeping: Add persistent_clock_exist flag

In current kernel, there are several places which need to check
whether there is a persistent clock for the platform. Current check
is done by calling the read_persistent_clock() and validating its
return value.

So one optimization is to do the check only once in timekeeping_init(),
and use a flag persistent_clock_exist to record it.

v2: Add a has_persistent_clock() helper function, as suggested by John.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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