[S390] Cleanup page table definitions.

- De-confuse the defines for the address-space-control-elements
  and the segment/region table entries.
- Create out of line functions for page table allocation / freeing.
- Simplify get_shadow_xxx functions.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 12 deletions

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index fd594d5fe142..1bd51d840484 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -75,29 +75,24 @@ static void __init_refok *vmem_alloc_pages(unsigned int order)
 
 static inline pmd_t *vmem_pmd_alloc(void)
 {
-        pmd_t *pmd;
-        int i;
+        pmd_t *pmd = NULL;
 
-        pmd = vmem_alloc_pages(PMD_ALLOC_ORDER);
+#ifdef CONFIG_64BIT
+        pmd = vmem_alloc_pages(2);
         if (!pmd)
                 return NULL;
-        for (i = 0; i < PTRS_PER_PMD; i++)
-                pmd_clear_kernel(pmd + i);
+        clear_table((unsigned long *) pmd, _SEGMENT_ENTRY_EMPTY, PAGE_SIZE*4);
+#endif
         return pmd;
 }
 
 static inline pte_t *vmem_pte_alloc(void)
 {
-        pte_t *pte;
-        pte_t empty_pte;
-        int i;
+        pte_t *pte = vmem_alloc_pages(0);
 
-        pte = vmem_alloc_pages(PTE_ALLOC_ORDER);
         if (!pte)
                 return NULL;
-        pte_val(empty_pte) = _PAGE_TYPE_EMPTY;
-        for (i = 0; i < PTRS_PER_PTE; i++)
-                pte[i] = empty_pte;
+        clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY, PAGE_SIZE);
         return pte;
 }