[S390] Add four level page tables for CONFIG_64BIT=y.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/tlb.h b/include/asm-s390/tlb.h
index ecac75e..9b2ddb7 100644
--- a/include/asm-s390/tlb.h
+++ b/include/asm-s390/tlb.h
@@ -38,7 +38,7 @@
struct mm_struct *mm;
unsigned int fullmm;
unsigned int nr_ptes;
- unsigned int nr_pmds;
+ unsigned int nr_pxds;
void *array[TLB_NR_PTRS];
};
@@ -53,7 +53,7 @@
tlb->fullmm = full_mm_flush || (num_online_cpus() == 1) ||
(atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm);
tlb->nr_ptes = 0;
- tlb->nr_pmds = TLB_NR_PTRS;
+ tlb->nr_pxds = TLB_NR_PTRS;
if (tlb->fullmm)
__tlb_flush_mm(mm);
return tlb;
@@ -62,12 +62,13 @@
static inline void tlb_flush_mmu(struct mmu_gather *tlb,
unsigned long start, unsigned long end)
{
- if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pmds < TLB_NR_PTRS))
+ if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pxds < TLB_NR_PTRS))
__tlb_flush_mm(tlb->mm);
while (tlb->nr_ptes > 0)
pte_free(tlb->mm, tlb->array[--tlb->nr_ptes]);
- while (tlb->nr_pmds < TLB_NR_PTRS)
- pmd_free(tlb->mm, (pmd_t *) tlb->array[tlb->nr_pmds++]);
+ while (tlb->nr_pxds < TLB_NR_PTRS)
+ /* pgd_free frees the pointer as region or segment table */
+ pgd_free(tlb->mm, tlb->array[tlb->nr_pxds++]);
}
static inline void tlb_finish_mmu(struct mmu_gather *tlb,
@@ -99,7 +100,7 @@
{
if (!tlb->fullmm) {
tlb->array[tlb->nr_ptes++] = pte;
- if (tlb->nr_ptes >= tlb->nr_pmds)
+ if (tlb->nr_ptes >= tlb->nr_pxds)
tlb_flush_mmu(tlb, 0, 0);
} else
pte_free(tlb->mm, pte);
@@ -113,15 +114,29 @@
{
#ifdef __s390x__
if (!tlb->fullmm) {
- tlb->array[--tlb->nr_pmds] = (struct page *) pmd;
- if (tlb->nr_ptes >= tlb->nr_pmds)
+ tlb->array[--tlb->nr_pxds] = pmd;
+ if (tlb->nr_ptes >= tlb->nr_pxds)
tlb_flush_mmu(tlb, 0, 0);
} else
pmd_free(tlb->mm, pmd);
#endif
}
-#define pud_free_tlb(tlb, pud) do { } while (0)
+/*
+ * pud_free_tlb frees a pud table and clears the CRSTE for the
+ * region third table entry from the tlb.
+ */
+static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
+{
+#ifdef __s390x__
+ if (!tlb->fullmm) {
+ tlb->array[--tlb->nr_pxds] = pud;
+ if (tlb->nr_ptes >= tlb->nr_pxds)
+ tlb_flush_mmu(tlb, 0, 0);
+ } else
+ pud_free(tlb->mm, pud);
+#endif
+}
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)