perf_counter: fix crash on perfmon v1 systems

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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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This commit is contained in:

Ingo Molnar 2009-03-18 08:59:21 +01:00

parent 4e193bd4df

commit 7bb497bd88

1 changed files with 11 additions and 5 deletions

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18

arch/x86/kernel/cpu/perf_counter.c

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