x86/pgtable.h: demacro ptep_set_access_flags

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, 16 insertions, 0 deletions

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 5accc08683c7..e7cda2057e1d 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -1,5 +1,6 @@
 #include <linux/mm.h>
 #include <asm/pgalloc.h>
+#include <asm/pgtable.h>
 #include <asm/tlb.h>
 
 pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
@@ -264,3 +265,18 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
         free_page((unsigned long)pgd);
 }
 #endif
+
+int ptep_set_access_flags(struct vm_area_struct *vma,
+                          unsigned long address, pte_t *ptep,
+                          pte_t entry, int dirty)
+{
+        int changed = !pte_same(*ptep, entry);
+
+        if (changed && dirty) {
+                *ptep = entry;
+                pte_update_defer(vma->vm_mm, address, ptep);
+                flush_tlb_page(vma, address);
+        }
+
+        return changed;
+}