sched_ext: Make scx_locked_rq() inline

scx_locked_rq() is used both from ext.c and ext_idle.c, move it to ext.h
as a static inline function.

No functional changes.

v2: Rename locked_rq to scx_locked_rq_state, expose it and make
    scx_locked_rq() inline, as suggested by Tejun.

Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/sched/ext.h b/kernel/sched/ext.h
index d30f2d1bc00d..6d6d00e9de20 100644
--- a/kernel/sched/ext.h
+++ b/kernel/sched/ext.h
@@ -20,6 +20,17 @@ static inline bool scx_rq_bypassing(struct rq *rq)
 
 DECLARE_STATIC_KEY_FALSE(scx_ops_allow_queued_wakeup);
 
+DECLARE_PER_CPU(struct rq *, scx_locked_rq_state);
+
+/*
+ * Return the rq currently locked from an scx callback, or NULL if no rq is
+ * locked.
+ */
+static inline struct rq *scx_locked_rq(void)
+{
+	return __this_cpu_read(scx_locked_rq_state);
+}
+
 void scx_tick(struct rq *rq);
 void init_scx_entity(struct sched_ext_entity *scx);
 void scx_pre_fork(struct task_struct *p);