sched_ext: Rename scx_kfunc_set_sleepable to unlocked and relocate

Sleepables don't need to be in its own kfunc set as each is tagged with
KF_SLEEPABLE. Rename to scx_kfunc_set_unlocked indicating that rq lock is
not held and relocate right above the any set. This will be used to add
kfuncs that are allowed to be called from SYSCALL but not TRACING.

No functional changes intended.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: David Vernet <[email protected]>

Author: htejun

kernel/sched/ext.c

@@ -5802,35 +5802,6 @@ void __init init_sched_ext_class(void)
 
 __bpf_kfunc_start_defs();
 
-/**
- * scx_bpf_create_dsq - Create a custom DSQ
- * @dsq_id: DSQ to create
- * @node: NUMA node to allocate from
- *
- * Create a custom DSQ identified by @dsq_id. Can be called from any sleepable
- * scx callback, and any BPF_PROG_TYPE_SYSCALL prog.
- */
-__bpf_kfunc s32 scx_bpf_create_dsq(u64 dsq_id, s32 node)
-{
-	if (unlikely(node >= (int)nr_node_ids ||
-		     (node < 0 && node != NUMA_NO_NODE)))
-		return -EINVAL;
-	return PTR_ERR_OR_ZERO(create_dsq(dsq_id, node));
-}
-
-__bpf_kfunc_end_defs();
-
-BTF_KFUNCS_START(scx_kfunc_ids_sleepable)
-BTF_ID_FLAGS(func, scx_bpf_create_dsq, KF_SLEEPABLE)
-BTF_KFUNCS_END(scx_kfunc_ids_sleepable)
-
-static const struct btf_kfunc_id_set scx_kfunc_set_sleepable = {
-	.owner			= THIS_MODULE,
-	.set			= &scx_kfunc_ids_sleepable,
-};
-
-__bpf_kfunc_start_defs();
-
 /**
  * scx_bpf_select_cpu_dfl - The default implementation of ops.select_cpu()
  * @p: task_struct to select a CPU for
@@ -6173,6 +6144,35 @@ static const struct btf_kfunc_id_set scx_kfunc_set_cpu_release = {
 
 __bpf_kfunc_start_defs();
 
+/**
+ * scx_bpf_create_dsq - Create a custom DSQ
+ * @dsq_id: DSQ to create
+ * @node: NUMA node to allocate from
+ *
+ * Create a custom DSQ identified by @dsq_id. Can be called from any sleepable
+ * scx callback, and any BPF_PROG_TYPE_SYSCALL prog.
+ */
+__bpf_kfunc s32 scx_bpf_create_dsq(u64 dsq_id, s32 node)
+{
+	if (unlikely(node >= (int)nr_node_ids ||
+		     (node < 0 && node != NUMA_NO_NODE)))
+		return -EINVAL;
+	return PTR_ERR_OR_ZERO(create_dsq(dsq_id, node));
+}
+
+__bpf_kfunc_end_defs();
+
+BTF_KFUNCS_START(scx_kfunc_ids_unlocked)
+BTF_ID_FLAGS(func, scx_bpf_create_dsq, KF_SLEEPABLE)
+BTF_KFUNCS_END(scx_kfunc_ids_unlocked)
+
+static const struct btf_kfunc_id_set scx_kfunc_set_unlocked = {
+	.owner			= THIS_MODULE,
+	.set			= &scx_kfunc_ids_unlocked,
+};
+
+__bpf_kfunc_start_defs();
+
 /**
  * scx_bpf_kick_cpu - Trigger reschedule on a CPU
  * @cpu: cpu to kick
@@ -6907,17 +6907,17 @@ static int __init scx_init(void)
 	 * check using scx_kf_allowed().
 	 */
 	if ((ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
-					     &scx_kfunc_set_sleepable)) ||
-	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,
-					     &scx_kfunc_set_sleepable)) ||
-	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
 					     &scx_kfunc_set_select_cpu)) ||
 	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
 					     &scx_kfunc_set_enqueue_dispatch)) ||
 	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
 					     &scx_kfunc_set_dispatch)) ||
 	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
 					     &scx_kfunc_set_cpu_release)) ||
+	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
+					     &scx_kfunc_set_unlocked)) ||
+	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,
+					     &scx_kfunc_set_unlocked)) ||
 	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
 					     &scx_kfunc_set_any)) ||
 	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING,