sys/uvm/uvm_amap.c

742 	struct vm_anon *anon, *nanon;
789 			nanon = uvm_analloc();
790 			if (nanon != NULL) {
792 				nanon->an_lock = amap->am_lock;
793 				npg = uvm_pagealloc(NULL, 0, nanon, 0);
797 			if (nanon == NULL || npg == NULL) {
800 				if (nanon != NULL) {
801 					nanon->an_lock = NULL;
802 					nanon->an_ref--;
803 					KASSERT(nanon->an_ref == 0);
804 					uvm_anfree(nanon);
817 			chunk->ac_anon[slot] = nanon;