From: Steven Rostedt <rostedt@goodmis.org>
Date: Wed, 12 Nov 2008 05:01:27 +0000 (-0500)
Subject: ring-buffer: no preempt for sched_clock()
X-Git-Tag: v2.6.28-rc6~53^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47e74f2ba8fbf9fb1378e2524e6cfdc2fb37f160;p=pandora-kernel.git

ring-buffer: no preempt for sched_clock()

Impact: disable preemption when calling sched_clock()

The ring_buffer_time_stamp still uses sched_clock as its counter.
But it is a bug to call it with preemption enabled. This requirement
should not be pushed to the ring_buffer_time_stamp callers, so
the ring_buffer_time_stamp needs to disable preemption when calling
sched_clock.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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