sched_ext: Minor cleanups in kernel/sched/ext.h

- scx_ops_cpu_preempt is only used in kernel/sched/ext.c and doesn't need to
  be global. Make it static.

- Relocate task_on_scx() so that the inline functions are located together.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David Vernet <void@manifault.com>

kernel/sched/ext.c

@@ -771,7 +771,7 @@ static bool scx_warned_zero_slice;
 
 static DEFINE_STATIC_KEY_FALSE(scx_ops_enq_last);
 static DEFINE_STATIC_KEY_FALSE(scx_ops_enq_exiting);
-DEFINE_STATIC_KEY_FALSE(scx_ops_cpu_preempt);
+static DEFINE_STATIC_KEY_FALSE(scx_ops_cpu_preempt);
 static DEFINE_STATIC_KEY_FALSE(scx_builtin_idle_enabled);
 
 struct static_key_false scx_has_op[SCX_OPI_END] =

kernel/sched/ext.h

@@ -26,13 +26,6 @@ DECLARE_STATIC_KEY_FALSE(__scx_switched_all);
 #define scx_enabled()		static_branch_unlikely(&__scx_ops_enabled)
 #define scx_switched_all()	static_branch_unlikely(&__scx_switched_all)
 
-DECLARE_STATIC_KEY_FALSE(scx_ops_cpu_preempt);
-
-static inline bool task_on_scx(const struct task_struct *p)
-{
-	return scx_enabled() && p->sched_class == &ext_sched_class;
-}
-
 void scx_tick(struct rq *rq);
 void init_scx_entity(struct sched_ext_entity *scx);
 void scx_pre_fork(struct task_struct *p);
@@ -54,6 +47,11 @@ static inline u32 scx_cpuperf_target(s32 cpu)
 		return 0;
 }
 
+static inline bool task_on_scx(const struct task_struct *p)
+{
+	return scx_enabled() && p->sched_class == &ext_sched_class;
+}
+
 static inline const struct sched_class *next_active_class(const struct sched_class *class)
 {
 	class++;