Index: head/sys/powerpc/aim/mmu_oea64.c
===================================================================
--- head/sys/powerpc/aim/mmu_oea64.c
+++ head/sys/powerpc/aim/mmu_oea64.c
@@ -2838,6 +2838,9 @@
 	vm_paddr_t pa;
 	vm_size_t len;
 
+	if (__predict_false(pm == NULL))
+		pm = &curthread->td_proc->p_vmspace->vm_pmap;
+
 	PMAP_LOCK(pm);
 	while (sz > 0) {
 		lim = round_page(va+1);