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Add the sched_smt_active() function needed for some x86 speculation mitigations. This was introduced upstream by commits1b568f0aab"sched/core: Optimize SCHED_SMT",ba2591a599"sched/smt: Update sched_smt_present at runtime",c5511d03ec"sched/smt: Make sched_smt_present track topology", and321a874a7e"sched/smt: Expose sched_smt_present static key". The upstream implementation uses the static_key_{disable,enable}_cpuslocked() functions, which aren't practical to backport. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>