/* it was not present in the active set.
* we are going to recycle an unused (or even "free") element.
* user may need to commit a transaction to record that change.
- * we serialize on flags & TF_DIRTY */
+ * we serialize on flags & LC_DIRTY */
if (test_and_set_bit(__LC_DIRTY, &lc->flags)) {
++lc->dirty;
RETURN(NULL);