[RFC PATCH bpf-next 5/8] sched_ext: Add filter for scx_kfunc_ids_cpu_release

[Juntong Deng]

This patch adds filter for scx_kfunc_ids_cpu_release.

The kfuncs in the scx_kfunc_ids_cpu_release set can be used in
cpu_release and other rq-locked operations.

Signed-off-by: Juntong Deng <juntong.deng@xxxxxxxxxxx>
---
 kernel/sched/ext.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index caddcf41e5f1..7f039a32f137 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -7026,9 +7026,25 @@ BTF_KFUNCS_START(scx_kfunc_ids_cpu_release)
 BTF_ID_FLAGS(func, scx_bpf_reenqueue_local)
 BTF_KFUNCS_END(scx_kfunc_ids_cpu_release)
 
+static int scx_kfunc_ids_cpu_release_filter(const struct bpf_prog *prog, u32 kfunc_id)
+{
+	u32 moff;
+
+	if (!btf_id_set8_contains(&scx_kfunc_ids_cpu_release, kfunc_id) ||
+	    prog->aux->st_ops != &bpf_sched_ext_ops)
+		return 0;
+
+	moff = prog->aux->attach_st_ops_member_off;
+	if (moff == offsetof(struct sched_ext_ops, cpu_release))
+		return 0;
+
+	return scx_kfunc_ids_other_rqlocked_filter(prog, kfunc_id);
+}
+
 static const struct btf_kfunc_id_set scx_kfunc_set_cpu_release = {
 	.owner			= THIS_MODULE,
 	.set			= &scx_kfunc_ids_cpu_release,
+	.filter			= scx_kfunc_ids_cpu_release_filter,
 };
 
 __bpf_kfunc_start_defs();
-- 
2.39.5