trace_seq_to_user
extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
ret = trace_seq_to_user(s, ubuf, cnt);
ret = trace_seq_to_user(&iter->seq, ubuf, cnt);
EXPORT_SYMBOL_GPL(trace_seq_to_user);