[PATCH 5/8] mm/rmap: make anon_vma functions internal

[Lorenzo Stoakes <lorenzo.stoakes@oracle.com>]

The bulk of the anon_vma operations are only used by mm, so formalise this
by putting the function prototypes and inlines in mm/internal.h. This
allows us to make changes without having to worry about the rest of the
kernel.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
---
 include/linux/rmap.h | 60 --------------------------------------------
 mm/internal.h        | 58 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 60 deletions(-)

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 832bfc0ccfc6..dd764951b03d 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -104,68 +104,8 @@ enum ttu_flags {
 };
 
 #ifdef CONFIG_MMU
-static inline void get_anon_vma(struct anon_vma *anon_vma)
-{
-	atomic_inc(&anon_vma->refcount);
-}
-
-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 void anon_vma_lock_write(struct anon_vma *anon_vma)
-{
-	down_write(&anon_vma->root->rwsem);
-}
 
-static inline int anon_vma_trylock_write(struct anon_vma *anon_vma)
-{
-	return down_write_trylock(&anon_vma->root->rwsem);
-}
-
-static inline void anon_vma_unlock_write(struct anon_vma *anon_vma)
-{
-	up_write(&anon_vma->root->rwsem);
-}
-
-static inline void anon_vma_lock_read(struct anon_vma *anon_vma)
-{
-	down_read(&anon_vma->root->rwsem);
-}
-
-static inline int anon_vma_trylock_read(struct anon_vma *anon_vma)
-{
-	return down_read_trylock(&anon_vma->root->rwsem);
-}
-
-static inline void anon_vma_unlock_read(struct anon_vma *anon_vma)
-{
-	up_read(&anon_vma->root->rwsem);
-}
-
-
-/*
- * anon_vma helper functions.
- */
 void anon_vma_init(void);	/* create anon_vma_cachep */
-int  __anon_vma_prepare(struct vm_area_struct *);
-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 *);
-
-static inline int anon_vma_prepare(struct vm_area_struct *vma)
-{
-	if (likely(vma->anon_vma))
-		return 0;
-
-	return __anon_vma_prepare(vma);
-}
-
-struct anon_vma *folio_get_anon_vma(const struct folio *folio);
 
 #ifdef CONFIG_MM_ID
 static __always_inline void folio_lock_large_mapcount(struct folio *folio)
diff --git a/mm/internal.h b/mm/internal.h
index e430da900430..469d4ef1ccc5 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -199,6 +199,64 @@ static inline void vma_close(struct vm_area_struct *vma)
 
 #ifdef CONFIG_MMU
 
+static inline void get_anon_vma(struct anon_vma *anon_vma)
+{
+	atomic_inc(&anon_vma->refcount);
+}
+
+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 void anon_vma_lock_write(struct anon_vma *anon_vma)
+{
+	down_write(&anon_vma->root->rwsem);
+}
+
+static inline int anon_vma_trylock_write(struct anon_vma *anon_vma)
+{
+	return down_write_trylock(&anon_vma->root->rwsem);
+}
+
+static inline void anon_vma_unlock_write(struct anon_vma *anon_vma)
+{
+	up_write(&anon_vma->root->rwsem);
+}
+
+static inline void anon_vma_lock_read(struct anon_vma *anon_vma)
+{
+	down_read(&anon_vma->root->rwsem);
+}
+
+static inline int anon_vma_trylock_read(struct anon_vma *anon_vma)
+{
+	return down_read_trylock(&anon_vma->root->rwsem);
+}
+
+static inline void anon_vma_unlock_read(struct anon_vma *anon_vma)
+{
+	up_read(&anon_vma->root->rwsem);
+}
+
+struct anon_vma *folio_get_anon_vma(const struct folio *folio);
+
+int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src);
+int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma);
+int  __anon_vma_prepare(struct vm_area_struct *vma);
+void unlink_anon_vmas(struct vm_area_struct *vma);
+
+static inline int anon_vma_prepare(struct vm_area_struct *vma)
+{
+	if (likely(vma->anon_vma))
+		return 0;
+
+	return __anon_vma_prepare(vma);
+}
+
 /* Flags for folio_pte_batch(). */
 typedef int __bitwise fpb_t;
 
-- 
2.52.0