Index: sys/vm/vm_phys.c
===================================================================
--- sys/vm/vm_phys.c
+++ sys/vm/vm_phys.c
@@ -70,6 +70,10 @@
 #include <vm/vm_phys.h>
 #include <vm/vm_pagequeue.h>
 
+#ifndef VM_DMA32_NPAGES_THRESHOLD
+#define	VM_DMA32_NPAGES_THRESHOLD	0
+#endif
+
 _Static_assert(sizeof(long) * NBBY >= VM_PHYSSEG_MAX,
     "Too many physsegs.");
 
@@ -487,7 +491,7 @@
 {
 	struct vm_freelist *fl;
 	struct vm_phys_seg *end_seg, *prev_seg, *seg, *tmp_seg;
-#if defined(VM_DMA32_NPAGES_THRESHOLD) || defined(VM_PHYSSEG_SPARSE)
+#if defined(VM_FREELIST_DMA32) || defined(VM_PHYSSEG_SPARSE)
 	u_long npages;
 #endif
 	int dom, flind, freelist, oind, pind, segind;
@@ -499,7 +503,7 @@
 	 * Initially, the entries of vm_freelist_to_flind[] are set to either
 	 * 0 or 1 to indicate which free lists should be created.
 	 */
-#ifdef	VM_DMA32_NPAGES_THRESHOLD
+#ifdef	VM_FREELIST_DMA32
 	npages = 0;
 #endif
 	for (segind = vm_phys_nsegs - 1; segind >= 0; segind--) {
@@ -510,21 +514,18 @@
 		else
 #endif
 #ifdef	VM_FREELIST_DMA32
-		if (
-#ifdef	VM_DMA32_NPAGES_THRESHOLD
-		    /*
-		     * Create the DMA32 free list only if the amount of
-		     * physical memory above physical address 4G exceeds the
-		     * given threshold.
-		     */
-		    npages > VM_DMA32_NPAGES_THRESHOLD &&
-#endif
+		/*
+		 * Create the DMA32 free list only if the amount of
+		 * physical memory above physical address 4G exceeds the
+		 * given threshold.
+		 */
+		if (npages > VM_DMA32_NPAGES_THRESHOLD &&
 		    seg->end <= VM_DMA32_BOUNDARY)
 			vm_freelist_to_flind[VM_FREELIST_DMA32] = 1;
 		else
 #endif
 		{
-#ifdef	VM_DMA32_NPAGES_THRESHOLD
+#ifdef	VM_FREELIST_DMA32
 			npages += atop(seg->end - seg->start);
 #endif
 			vm_freelist_to_flind[VM_FREELIST_DEFAULT] = 1;