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Using ALTERNATIVE() when checking for X86_FEATURE_PERFCTR_CORE avoids an extra pointer chase and data cache hit. Signed-off-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1302913676-14352-4-git-send-email-robert.richter@amd.com Signed-off-by: Ingo Molnar <mingo@elte.hu>