From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 18 Sep 2009 18:14:01 +0000 (+0200)
Subject: sched_clock: Make it NMI safe
X-Git-Tag: v2.6.32-rc1~628^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=def0a9b2573e00ab0b486cb5382625203ab4c4a6;p=pandora-kernel.git

sched_clock: Make it NMI safe

Arjan complained about the suckyness of TSC on modern machines, and
asked if we could do something about that for PERF_SAMPLE_TIME.

Make cpu_clock() NMI safe by removing the spinlock and using
cmpxchg. This also makes it smaller and more robust.

Affects architectures that use HAVE_UNSTABLE_SCHED_CLOCK, i.e. IA64
and x86.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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