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-rw-r--r--include/linux/rmap.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 0b4913a4a34..980094a527e 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -26,6 +26,9 @@
*/
struct anon_vma {
spinlock_t lock; /* Serialize access to vma list */
+#ifdef CONFIG_KSM
+ atomic_t ksm_refcount;
+#endif
/*
* NOTE: the LSB of the head.next is set by
* mm_take_all_locks() _after_ taking the above lock. So the
@@ -38,6 +41,26 @@ struct anon_vma {
};
#ifdef CONFIG_MMU
+#ifdef CONFIG_KSM
+static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+{
+ atomic_set(&anon_vma->ksm_refcount, 0);
+}
+
+static inline int ksm_refcount(struct anon_vma *anon_vma)
+{
+ return atomic_read(&anon_vma->ksm_refcount);
+}
+#else
+static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+{
+}
+
+static inline int ksm_refcount(struct anon_vma *anon_vma)
+{
+ return 0;
+}
+#endif /* CONFIG_KSM */
static inline struct anon_vma *page_anon_vma(struct page *page)
{
@@ -70,6 +93,7 @@ void __anon_vma_merge(struct vm_area_struct *, struct vm_area_struct *);
void anon_vma_unlink(struct vm_area_struct *);
void anon_vma_link(struct vm_area_struct *);
void __anon_vma_link(struct vm_area_struct *);
+void anon_vma_free(struct anon_vma *);
/*
* rmap interfaces called when adding or removing pte of page