diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 01dfe20..248a710 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -112,8 +112,8 @@
 	init_mm.pgd = swapper_pg_dir;
 	S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
 #ifdef CONFIG_64BIT
-	S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
-	pgd_type = _REGION3_ENTRY_EMPTY;
+	S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
+	pgd_type = _REGION2_ENTRY_EMPTY;
 #else
 	S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
 	pgd_type = _SEGMENT_ENTRY_EMPTY;
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 434491f..35d90a4 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -69,7 +69,19 @@
 	return alloc_bootmem_pages((1 << order) * PAGE_SIZE);
 }
 
-#define vmem_pud_alloc()	({ BUG(); ((pud_t *) NULL); })
+static inline pud_t *vmem_pud_alloc(void)
+{
+	pud_t *pud = NULL;
+
+#ifdef CONFIG_64BIT
+	pud = vmem_alloc_pages(2);
+	if (!pud)
+		return NULL;
+	pud_val(*pud) = _REGION3_ENTRY_EMPTY;
+	memcpy(pud + 1, pud, (PTRS_PER_PUD - 1)*sizeof(pud_t));
+#endif
+	return pud;
+}
 
 static inline pmd_t *vmem_pmd_alloc(void)
 {