1 files changed, 25 insertions, 0 deletions

diff --git a/arch/powerpc/mm/hugetlbpage-hash64.c b/arch/powerpc/mm/hugetlbpage-hash64.c
index 2e6a8f9345d3..367ce3a4a503 100644
--- a/arch/powerpc/mm/hugetlbpage-hash64.c
+++ b/arch/powerpc/mm/hugetlbpage-hash64.c
@@ -121,3 +121,28 @@ int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
         *ptep = __pte(new_pte & ~H_PAGE_BUSY);
         return 0;
 }
+
+pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
+                                  unsigned long addr, pte_t *ptep)
+{
+        unsigned long pte_val;
+        /*
+         * Clear the _PAGE_PRESENT so that no hardware parallel update is
+         * possible. Also keep the pte_present true so that we don't take
+         * wrong fault.
+         */
+        pte_val = pte_update(vma->vm_mm, addr, ptep,
+                             _PAGE_PRESENT, _PAGE_INVALID, 1);
+
+        return __pte(pte_val);
+}
+
+void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
+                                  pte_t *ptep, pte_t old_pte, pte_t pte)
+{
+
+        if (radix_enabled())
+                return radix__huge_ptep_modify_prot_commit(vma, addr, ptep,
+                                                           old_pte, pte);
+        set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
+}