[S390] Add four level page tables for CONFIG_64BIT=y.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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)
{