offset = v_read(config, &buf->offset);
idx = subbuf_index(offset, chan);
commit_count = v_read(config, &cc_hot->cc);
+ commit_count += cc_hot->cc_rseq;
} while (offset != v_read(config, &buf->offset));
return ((buf_trunc(offset, chan) >> chan->backend.num_subbuf_order)