From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 18 Mar 2009 07:59:21 +0000 (+0100)
Subject: perf_counter: fix crash on perfmon v1 systems
X-Git-Tag: v2.6.31-rc1~383^2~472
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bb497bd885eedd0f56dfe3cc1b5ff20710d33b9;p=pandora-kernel.git

perf_counter: fix crash on perfmon v1 systems

Impact: fix boot crash on Intel Perfmon Version 1 systems

Intel Perfmon v1 does not support the global MSRs, nor does
it offer the generalized MSR ranges. So support v2 and later
CPUs only.

Also mark pmc_ops as read-mostly - to avoid false cacheline
sharing.

Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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