mm: simplify anon_vma refcounts

[~andy/linux] / include / linux / rmap.h

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index fd56111a52c1ca4e02c2626f5e6387da7f7bff9f..830e65dc01ee1f264e715632f2f99fd95c7bd529 100644 (file)
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -73,7 +73,13 @@ static inline void get_anon_vma(struct anon_vma *anon_vma)
        atomic_inc(&anon_vma->refcount);
 }
 
-void put_anon_vma(struct anon_vma *);
+void __put_anon_vma(struct anon_vma *anon_vma);
+
+static inline void put_anon_vma(struct anon_vma *anon_vma)
+{
+       if (atomic_dec_and_test(&anon_vma->refcount))
+               __put_anon_vma(anon_vma);
+}
 
 static inline struct anon_vma *page_anon_vma(struct page *page)
 {
@@ -116,7 +122,6 @@ void unlink_anon_vmas(struct vm_area_struct *);
 int anon_vma_clone(struct vm_area_struct *, struct vm_area_struct *);
 int anon_vma_fork(struct vm_area_struct *, struct vm_area_struct *);
 void __anon_vma_link(struct vm_area_struct *);
-void anon_vma_free(struct anon_vma *);
 
 static inline void anon_vma_merge(struct vm_area_struct *vma,
                                  struct vm_area_struct *next)
@@ -125,6 +130,8 @@ static inline void anon_vma_merge(struct vm_area_struct *vma,
        unlink_anon_vmas(next);
 }
 
+struct anon_vma *page_get_anon_vma(struct page *page);
+
 /*
  * rmap interfaces called when adding or removing pte of page
  */