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Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
-rw-r--r--arch/s390/include/asm/pgtable.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index f79e7bb9ae1e..986dc9476c21 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -772,6 +772,34 @@ static inline pte_t pte_mkspecial(pte_t pte)
return pte;
}
+#ifdef CONFIG_HUGETLB_PAGE
+static inline pte_t pte_mkhuge(pte_t pte)
+{
+ /*
+ * PROT_NONE needs to be remapped from the pte type to the ste type.
+ * The HW invalid bit is also different for pte and ste. The pte
+ * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
+ * bit, so we don't have to clear it.
+ */
+ if (pte_val(pte) & _PAGE_INVALID) {
+ if (pte_val(pte) & _PAGE_SWT)
+ pte_val(pte) |= _HPAGE_TYPE_NONE;
+ pte_val(pte) |= _SEGMENT_ENTRY_INV;
+ }
+ /*
+ * Clear SW pte bits SWT and SWX, there are no SW bits in a segment
+ * table entry.
+ */
+ pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
+ /*
+ * Also set the change-override bit because we don't need dirty bit
+ * tracking for hugetlbfs pages.
+ */
+ pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
+ return pte;
+}
+#endif
+
#ifdef CONFIG_PGSTE
/*
* Get (and clear) the user dirty bit for a PTE.