[PATCH 01/15] sched_ext: Relocate scx_bpf_task_cgroup() and its BTF_ID to the end of kfunc section

[Tejun Heo]

Move scx_bpf_task_cgroup() kfunc definition and its BTF_ID entry to the end
of the kfunc section before __bpf_kfunc_end_defs() for cleaner code
organization.

No functional changes.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
 kernel/sched/ext.c | 78 +++++++++++++++++++++++-----------------------
 1 file changed, 39 insertions(+), 39 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index e25b3593dd30..fe222df1d494 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -8628,43 +8628,6 @@ __bpf_kfunc struct task_struct *scx_bpf_cpu_curr(s32 cpu, const struct bpf_prog_
 	return rcu_dereference(cpu_rq(cpu)->curr);
 }
 
-/**
- * scx_bpf_task_cgroup - Return the sched cgroup of a task
- * @p: task of interest
- * @aux: implicit BPF argument to access bpf_prog_aux hidden from BPF progs
- *
- * @p->sched_task_group->css.cgroup represents the cgroup @p is associated with
- * from the scheduler's POV. SCX operations should use this function to
- * determine @p's current cgroup as, unlike following @p->cgroups,
- * @p->sched_task_group is protected by @p's rq lock and thus atomic w.r.t. all
- * rq-locked operations. Can be called on the parameter tasks of rq-locked
- * operations. The restriction guarantees that @p's rq is locked by the caller.
- */
-#ifdef CONFIG_CGROUP_SCHED
-__bpf_kfunc struct cgroup *scx_bpf_task_cgroup(struct task_struct *p,
-					       const struct bpf_prog_aux *aux)
-{
-	struct task_group *tg = p->sched_task_group;
-	struct cgroup *cgrp = &cgrp_dfl_root.cgrp;
-	struct scx_sched *sch;
-
-	guard(rcu)();
-
-	sch = scx_prog_sched(aux);
-	if (unlikely(!sch))
-		goto out;
-
-	if (!scx_kf_allowed_on_arg_tasks(sch, __SCX_KF_RQ_LOCKED, p))
-		goto out;
-
-	cgrp = tg_cgrp(tg);
-
-out:
-	cgroup_get(cgrp);
-	return cgrp;
-}
-#endif
-
 /**
  * scx_bpf_now - Returns a high-performance monotonically non-decreasing
  * clock for the current CPU. The clock returned is in nanoseconds.
@@ -8779,6 +8742,43 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
 	memcpy(events, &e_sys, events__sz);
 }
 
+#ifdef CONFIG_CGROUP_SCHED
+/**
+ * scx_bpf_task_cgroup - Return the sched cgroup of a task
+ * @p: task of interest
+ * @aux: implicit BPF argument to access bpf_prog_aux hidden from BPF progs
+ *
+ * @p->sched_task_group->css.cgroup represents the cgroup @p is associated with
+ * from the scheduler's POV. SCX operations should use this function to
+ * determine @p's current cgroup as, unlike following @p->cgroups,
+ * @p->sched_task_group is protected by @p's rq lock and thus atomic w.r.t. all
+ * rq-locked operations. Can be called on the parameter tasks of rq-locked
+ * operations. The restriction guarantees that @p's rq is locked by the caller.
+ */
+__bpf_kfunc struct cgroup *scx_bpf_task_cgroup(struct task_struct *p,
+					       const struct bpf_prog_aux *aux)
+{
+	struct task_group *tg = p->sched_task_group;
+	struct cgroup *cgrp = &cgrp_dfl_root.cgrp;
+	struct scx_sched *sch;
+
+	guard(rcu)();
+
+	sch = scx_prog_sched(aux);
+	if (unlikely(!sch))
+		goto out;
+
+	if (!scx_kf_allowed_on_arg_tasks(sch, __SCX_KF_RQ_LOCKED, p))
+		goto out;
+
+	cgrp = tg_cgrp(tg);
+
+out:
+	cgroup_get(cgrp);
+	return cgrp;
+}
+#endif	/* CONFIG_CGROUP_SCHED */
+
 __bpf_kfunc_end_defs();
 
 BTF_KFUNCS_START(scx_kfunc_ids_any)
@@ -8808,11 +8808,11 @@ BTF_ID_FLAGS(func, scx_bpf_task_cpu, KF_RCU)
 BTF_ID_FLAGS(func, scx_bpf_cpu_rq, KF_IMPLICIT_ARGS)
 BTF_ID_FLAGS(func, scx_bpf_locked_rq, KF_IMPLICIT_ARGS | KF_RET_NULL)
 BTF_ID_FLAGS(func, scx_bpf_cpu_curr, KF_IMPLICIT_ARGS | KF_RET_NULL | KF_RCU_PROTECTED)
+BTF_ID_FLAGS(func, scx_bpf_now)
+BTF_ID_FLAGS(func, scx_bpf_events)
 #ifdef CONFIG_CGROUP_SCHED
 BTF_ID_FLAGS(func, scx_bpf_task_cgroup, KF_IMPLICIT_ARGS | KF_RCU | KF_ACQUIRE)
 #endif
-BTF_ID_FLAGS(func, scx_bpf_now)
-BTF_ID_FLAGS(func, scx_bpf_events)
 BTF_KFUNCS_END(scx_kfunc_ids_any)
 
 static const struct btf_kfunc_id_set scx_kfunc_set_any = {
-- 
2.53.0