202 	u_check_tree(uhp->uh_prev.ptr, uhp, NULL);  in u_check_tree()
566 	uhp->uh_prev.ptr = NULL;  in u_savecommon()
581 	    curbuf->b_u_newhead->uh_prev.ptr = uhp;  in u_savecommon()
1291     put_header_ptr(bi, uhp->uh_prev.ptr);  in serialize_uhp()
1340     uhp->uh_prev.seq = undo_read_4c(bi);  in unserialize_uhp()
1760 	if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != mark)  in u_write_undo()
1761 	    uhp = uhp->uh_prev.ptr;  in u_write_undo()
2100 				  && uhp_table[j]->uh_seq == uhp->uh_prev.seq)  in u_read_undo()
2102 		uhp->uh_prev.ptr = uhp_table[j];  in u_read_undo()
2296 	    if (curbuf->b_u_curhead->uh_prev.ptr == NULL)  in u_doit()
2298 	    curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev.ptr;  in u_doit()
2489 	    if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark  in undo_time()
2490 					 && uhp->uh_prev.ptr->uh_walk != mark)  in undo_time()
2491 		uhp = uhp->uh_prev.ptr;  in undo_time()
2617 			uhp->uh_next.ptr->uh_prev.ptr = uhp;  in undo_time()
2636 		if (uhp->uh_prev.ptr == NULL)  in undo_time()
2638 		curbuf->b_u_curhead = uhp->uh_prev.ptr;  in undo_time()
2644 		uhp = uhp->uh_prev.ptr;  in undo_time()
3094 	if (uhp->uh_prev.ptr == NULL && uhp->uh_walk != nomark  in ex_undolist()
3116 	if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark  in ex_undolist()
3117 					 && uhp->uh_prev.ptr->uh_walk != mark)  in ex_undolist()
3119 	    uhp = uhp->uh_prev.ptr;  in ex_undolist()
3273     for (uh = uhp; uh != NULL; uh = uh->uh_prev.ptr)  in u_unch_branch()
3356 	buf->b_u_oldhead = uhp->uh_prev.ptr;  in u_freeheader()
3358 	uhp->uh_next.ptr->uh_prev.ptr = uhp->uh_prev.ptr;  in u_freeheader()
3360     if (uhp->uh_prev.ptr == NULL)  in u_freeheader()
3363 	for (uhap = uhp->uh_prev.ptr; uhap != NULL;  in u_freeheader()
3399 	next = tofree->uh_prev.ptr;  in u_freebranch()
3644 	uhp = uhp->uh_prev.ptr;  in u_eval_tree()