perf_event: Fix preempt warning in perf_clock()
A recent commit introduced a preemption warning for perf_clock(), use raw_smp_processor_id() to avoid this, it really doesn't matter which cpu we use here. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1267198583.22519.684.camel@laptop> Cc: <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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