x86/topology: Provide topology_smt_supported()
Provide information whether SMT is supoorted by the CPUs. Preparatory patch for SMT control mechanism. Suggested-by: NDave Hansen <dave.hansen@intel.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Acked-by: NIngo Molnar <mingo@kernel.org>
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