diff --git a/sys/powerpc/aim/mmu_radix.c b/sys/powerpc/aim/mmu_radix.c
--- a/sys/powerpc/aim/mmu_radix.c
+++ b/sys/powerpc/aim/mmu_radix.c
@@ -3137,6 +3137,28 @@
 	return (rv);
 }
 
+/*
+ * Release a page table page reference after a failed attempt to create a
+ * mapping.
+ */
+static void
+pmap_abort_ptp(pmap_t pmap, vm_offset_t va, vm_page_t pdpg)
+{
+	struct spglist free;
+
+	SLIST_INIT(&free);
+	if (pmap_unwire_ptp(pmap, va, pdpg, &free)) {
+		/*
+		 * Although "va" is not mapped, paging-
+		 * structure caches could nonetheless have
+		 * entries that refer to the freed page table
+		 * pages.  Invalidate those entries.
+		 */
+		pmap_invalidate_page(pmap, va);
+		vm_page_free_pages_toq(&free, true);
+	}
+}
+
 /*
  * Tries to create a read- and/or execute-only 2MB page mapping.  Returns true
  * if successful.  Returns false if (1) a page table page cannot be allocated
@@ -3264,17 +3286,7 @@
 		 * Abort this mapping if its PV entry could not be created.
 		 */
 		if (!pmap_pv_insert_l3e(pmap, va, newpde, flags, lockp)) {
-			SLIST_INIT(&free);
-			if (pmap_unwire_ptp(pmap, va, pdpg, &free)) {
-				/*
-				 * Although "va" is not mapped, paging-
-				 * structure caches could nonetheless have
-				 * entries that refer to the freed page table
-				 * pages.  Invalidate those entries.
-				 */
-				pmap_invalidate_page(pmap, va);
-				vm_page_free_pages_toq(&free, true);
-			}
+			pmap_abort_ptp(pmap, va, pdpg);
 			if (uwptpg != NULL) {
 				mt = pmap_remove_pt_page(pmap, va);
 				KASSERT(mt == uwptpg,