+static void remove_duplicate_parents(struct commit *commit)
+{
+ struct commit_list **pp, *p;
+
+ /* Examine existing parents while marking ones we have seen... */
+ pp = &commit->parents;
+ while ((p = *pp) != NULL) {
+ struct commit *parent = p->item;
+ if (parent->object.flags & TMP_MARK) {
+ *pp = p->next;
+ continue;
+ }
+ parent->object.flags |= TMP_MARK;
+ pp = &p->next;
+ }
+ /* ... and clear the temporary mark */
+ for (p = commit->parents; p; p = p->next)
+ p->item->object.flags &= ~TMP_MARK;
+}
+