linux-kernel - [PATCH v4 1/5] mm: move vma_policy() and anon_vma_name() decls to mm

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Date:   Wed, 11 Oct 2023 18:04:27 +0100
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>
Cc:     "=Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        linux-fsdevel@...r.kernel.org, Lorenzo Stoakes <lstoakes@...il.com>
Subject: [PATCH v4 1/5] mm: move vma_policy() and anon_vma_name() decls to mm_types.h

The vma_policy() define is a helper specifically for a VMA field so it
makes sense to host it in the memory management types header.

The anon_vma_name(), anon_vma_name_alloc() and anon_vma_name_free()
functions are a little out of place in mm_inline.h as they define external
functions, and so it makes sense to locate them in mm_types.h.

The purpose of these relocations is to make it possible to abstract static
inline wrappers which invoke both of these helpers.

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
---
 include/linux/mempolicy.h |  4 ----
 include/linux/mm_inline.h | 20 +-------------------
 include/linux/mm_types.h  | 27 +++++++++++++++++++++++++++
 3 files changed, 28 insertions(+), 23 deletions(-)

diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 3c208d4f0ee9..2801d5b0a4e9 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -89,8 +89,6 @@ static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
 	return pol;
 }
 
-#define vma_policy(vma) ((vma)->vm_policy)
-
 static inline void mpol_get(struct mempolicy *pol)
 {
 	if (pol)
@@ -222,8 +220,6 @@ static inline struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
 	return NULL;
 }
 
-#define vma_policy(vma) NULL
-
 static inline int
 vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
 {
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 8148b30a9df1..9ae7def16cb2 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -4,6 +4,7 @@
 
 #include <linux/atomic.h>
 #include <linux/huge_mm.h>
+#include <linux/mm_types.h>
 #include <linux/swap.h>
 #include <linux/string.h>
 #include <linux/userfaultfd_k.h>
@@ -352,15 +353,6 @@ void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
 }
 
 #ifdef CONFIG_ANON_VMA_NAME
-/*
- * mmap_lock should be read-locked when calling anon_vma_name(). Caller should
- * either keep holding the lock while using the returned pointer or it should
- * raise anon_vma_name refcount before releasing the lock.
- */
-extern struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma);
-extern struct anon_vma_name *anon_vma_name_alloc(const char *name);
-extern void anon_vma_name_free(struct kref *kref);
-
 /* mmap_lock should be read-locked */
 static inline void anon_vma_name_get(struct anon_vma_name *anon_name)
 {
@@ -415,16 +407,6 @@ static inline bool anon_vma_name_eq(struct anon_vma_name *anon_name1,
 }
 
 #else /* CONFIG_ANON_VMA_NAME */
-static inline struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma)
-{
-	return NULL;
-}
-
-static inline struct anon_vma_name *anon_vma_name_alloc(const char *name)
-{
-	return NULL;
-}
-
 static inline void anon_vma_name_get(struct anon_vma_name *anon_name) {}
 static inline void anon_vma_name_put(struct anon_vma_name *anon_name) {}
 static inline void dup_anon_vma_name(struct vm_area_struct *orig_vma,
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 36c5b43999e6..21eb56145f57 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -546,6 +546,27 @@ struct anon_vma_name {
 	char name[];
 };
 
+#ifdef CONFIG_ANON_VMA_NAME
+/*
+ * mmap_lock should be read-locked when calling anon_vma_name(). Caller should
+ * either keep holding the lock while using the returned pointer or it should
+ * raise anon_vma_name refcount before releasing the lock.
+ */
+struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma);
+struct anon_vma_name *anon_vma_name_alloc(const char *name);
+void anon_vma_name_free(struct kref *kref);
+#else /* CONFIG_ANON_VMA_NAME */
+static inline struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma)
+{
+	return NULL;
+}
+
+static inline struct anon_vma_name *anon_vma_name_alloc(const char *name)
+{
+	return NULL;
+}
+#endif
+
 struct vma_lock {
 	struct rw_semaphore lock;
 };
@@ -662,6 +683,12 @@ struct vm_area_struct {
 	struct vm_userfaultfd_ctx vm_userfaultfd_ctx;
 } __randomize_layout;
 
+#ifdef CONFIG_NUMA
+#define vma_policy(vma) ((vma)->vm_policy)
+#else
+#define vma_policy(vma) NULL
+#endif
+
 #ifdef CONFIG_SCHED_MM_CID
 struct mm_cid {
 	u64 time;
-- 
2.42.0