diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -5595,8 +5595,7 @@
 			pv = &pc->pc_pventry[field * 64 + bit];
 			pc->pc_map[field] &= ~(1ul << bit);
 			/* If this was the last item, move it to tail */
-			if (pc->pc_map[0] == 0 && pc->pc_map[1] == 0 &&
-			    pc->pc_map[2] == 0) {
+			if (pc_is_full(pc)) {
 				TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
 				TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc,
 				    pc_list);
@@ -5807,8 +5806,7 @@
 	va_last = va + NBPDR - PAGE_SIZE;
 	for (;;) {
 		pc = TAILQ_FIRST(&pmap->pm_pvchunk);
-		KASSERT(pc->pc_map[0] != 0 || pc->pc_map[1] != 0 ||
-		    pc->pc_map[2] != 0, ("pmap_pv_demote_pde: missing spare"));
+		KASSERT(!pc_is_full(pc), ("pmap_pv_demote_pde: missing spare"));
 		for (field = 0; field < _NPCM; field++) {
 			while (pc->pc_map[field]) {
 				bit = bsfq(pc->pc_map[field]);
@@ -5829,7 +5827,7 @@
 		TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list);
 	}
 out:
-	if (pc->pc_map[0] == 0 && pc->pc_map[1] == 0 && pc->pc_map[2] == 0) {
+	if (pc_is_full(pc)) {
 		TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
 		TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list);
 	}