sched/core: Optimize SCHED_SMT

[cascardo/linux.git] / kernel / sched / sched.h

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c917dca..01b5189 100644 (file)
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -36,12 +36,6 @@ extern void cpu_load_update_active(struct rq *this_rq);
 static inline void cpu_load_update_active(struct rq *this_rq) { }
 #endif
 
-#ifdef CONFIG_SCHED_SMT
-extern void update_idle_core(struct rq *rq);
-#else
-static inline void update_idle_core(struct rq *rq) { }
-#endif
-
 /*
  * Helpers for converting nanosecond timing to jiffy resolution
  */
@@ -730,6 +724,23 @@ static inline int cpu_of(struct rq *rq)
 #endif
 }
 
+
+#ifdef CONFIG_SCHED_SMT
+
+extern struct static_key_false sched_smt_present;
+
+extern void __update_idle_core(struct rq *rq);
+
+static inline void update_idle_core(struct rq *rq)
+{
+       if (static_branch_unlikely(&sched_smt_present))
+               __update_idle_core(rq);
+}
+
+#else
+static inline void update_idle_core(struct rq *rq) { }
+#endif
+
 DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 
 #define cpu_rq(cpu)            (&per_cpu(runqueues, (cpu)))