mmu-notifier: add clear_young callback

[karo-tx-linux.git] / include / linux / mmu_notifier.h

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 61cd67f4d7881cbbd8eba481729c06b31d45e9c6..a5b17137c683c19c33525d1a4dfe5203607806a9 100644 (file)
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -65,6 +65,16 @@ struct mmu_notifier_ops {
                                 unsigned long start,
                                 unsigned long end);
 
+       /*
+        * clear_young is a lightweight version of clear_flush_young. Like the
+        * latter, it is supposed to test-and-clear the young/accessed bitflag
+        * in the secondary pte, but it may omit flushing the secondary tlb.
+        */
+       int (*clear_young)(struct mmu_notifier *mn,
+                          struct mm_struct *mm,
+                          unsigned long start,
+                          unsigned long end);
+
        /*
         * test_young is called to check the young/accessed bitflag in
         * the secondary pte. This is used to know if the page is
@@ -203,6 +213,9 @@ extern void __mmu_notifier_release(struct mm_struct *mm);
 extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
                                          unsigned long start,
                                          unsigned long end);
+extern int __mmu_notifier_clear_young(struct mm_struct *mm,
+                                     unsigned long start,
+                                     unsigned long end);
 extern int __mmu_notifier_test_young(struct mm_struct *mm,
                                     unsigned long address);
 extern void __mmu_notifier_change_pte(struct mm_struct *mm,
@@ -231,6 +244,15 @@ static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
        return 0;
 }
 
+static inline int mmu_notifier_clear_young(struct mm_struct *mm,
+                                          unsigned long start,
+                                          unsigned long end)
+{
+       if (mm_has_notifiers(mm))
+               return __mmu_notifier_clear_young(mm, start, end);
+       return 0;
+}
+
 static inline int mmu_notifier_test_young(struct mm_struct *mm,
                                          unsigned long address)
 {
@@ -311,6 +333,28 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
        __young;                                                        \
 })
 
+#define ptep_clear_young_notify(__vma, __address, __ptep)              \
+({                                                                     \
+       int __young;                                                    \
+       struct vm_area_struct *___vma = __vma;                          \
+       unsigned long ___address = __address;                           \
+       __young = ptep_test_and_clear_young(___vma, ___address, __ptep);\
+       __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address,  \
+                                           ___address + PAGE_SIZE);    \
+       __young;                                                        \
+})
+
+#define pmdp_clear_young_notify(__vma, __address, __pmdp)              \
+({                                                                     \
+       int __young;                                                    \
+       struct vm_area_struct *___vma = __vma;                          \
+       unsigned long ___address = __address;                           \
+       __young = pmdp_test_and_clear_young(___vma, ___address, __pmdp);\
+       __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address,  \
+                                           ___address + PMD_SIZE);     \
+       __young;                                                        \
+})
+
 #define        ptep_clear_flush_notify(__vma, __address, __ptep)               \
 ({                                                                     \
        unsigned long ___addr = __address & PAGE_MASK;                  \