Hi Jeff,

[...]

+static __maybe_unused int
+ref_tracker_dir_seq_print(struct ref_tracker_dir *dir, struct seq_file *seq)
+{
+	struct ostream os = { .func = pr_ostream_seq,
+			      .prefix = "",

This is also a "ref_tracker_*" function, so maybe use the same
prefix as in other functions? I mean .prefix = "ref_tracker:".
Unless, you have a reason for leaving it empty ;)

---
Best Regards,
Krzysztof