perfcounters: fix non-intel-perfmon CPUs
Do not write MSR_CORE_PERF_GLOBAL_CTRL on CPUs where it does not exist.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
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Do not write MSR_CORE_PERF_GLOBAL_CTRL on CPUs where it does not exist.
Signed-off-by: NIngo Molnar <mingo@elte.hu>