1 files changed, 31 insertions, 0 deletions

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 3feec5af4e67..6cbdff26bb96 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -445,6 +445,26 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
 
         return changed;
 }
+
+int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
+                          pud_t *pudp, pud_t entry, int dirty)
+{
+        int changed = !pud_same(*pudp, entry);
+
+        VM_BUG_ON(address & ~HPAGE_PUD_MASK);
+
+        if (changed && dirty) {
+                *pudp = entry;
+                /*
+                 * We had a write-protection fault here and changed the pud
+                 * to to more permissive. No need to flush the TLB for that,
+                 * #PF is architecturally guaranteed to do that and in the
+                 * worst-case we'll generate a spurious fault.
+                 */
+        }
+
+        return changed;
+}
 #endif
 
 int ptep_test_and_clear_young(struct vm_area_struct *vma,
@@ -474,6 +494,17 @@ int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 
         return ret;
 }
+int pudp_test_and_clear_young(struct vm_area_struct *vma,
+                              unsigned long addr, pud_t *pudp)
+{
+        int ret = 0;
+
+        if (pud_young(*pudp))
+                ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
+                                         (unsigned long *)pudp);
+
+        return ret;
+}
 #endif
 
 int ptep_clear_flush_young(struct vm_area_struct *vma,