x86/pgtable.h: demacro ptep_test_and_clear_young

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index e7cda2057e1d..54bd77a7eee0 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -280,3 +280,18 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
 
         return changed;
 }
+
+int ptep_test_and_clear_young(struct vm_area_struct *vma,
+                              unsigned long addr, pte_t *ptep)
+{
+        int ret = 0;
+
+        if (pte_young(*ptep))
+                ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
+                                         &ptep->pte);
+
+        if (ret)
+                pte_update(vma->vm_mm, addr, ptep);
+
+        return ret;
+}