Index: sys/vm/vm_reserv.c
===================================================================
--- sys/vm/vm_reserv.c
+++ sys/vm/vm_reserv.c
@@ -316,7 +316,7 @@
 	for (segind = 0; segind < vm_phys_nsegs; segind++) {
 		seg = &vm_phys_segs[segind];
 		paddr = roundup2(seg->start, VM_LEVEL_0_SIZE);
-		while (paddr + VM_LEVEL_0_SIZE <= seg->end) {
+		while (paddr <= seg->end - VM_LEVEL_0_SIZE) {
 			rv = &vm_reserv_array[paddr >> VM_LEVEL_0_SHIFT];
 			fullpop += rv->popcnt == VM_LEVEL_0_NPAGES;
 			paddr += VM_LEVEL_0_SIZE;
@@ -1055,7 +1055,7 @@
 	for (segind = 0; segind < vm_phys_nsegs; segind++) {
 		seg = &vm_phys_segs[segind];
 		paddr = roundup2(seg->start, VM_LEVEL_0_SIZE);
-		while (paddr + VM_LEVEL_0_SIZE <= seg->end) {
+		while (paddr <= seg->end - VM_LEVEL_0_SIZE) {
 			rv = &vm_reserv_array[paddr >> VM_LEVEL_0_SHIFT];
 			rv->pages = PHYS_TO_VM_PAGE(paddr);
 			rv->domain = seg->domain;