[17/16] slab: make kmem_cache_create_usercopy() static inline

Commit Message

Christian Brauner Sept. 4, 2024, 9:44 a.m. UTC

Make kmem_cache_create_usercopy() a static inline function.

Signed-off-by: Christian Brauner <[e-mail]>
---

Based on a suggestion by Mike.

---
 include/linux/slab.h | 49 +++++++++++++++++++++++++++++++++++++++-----
 mm/slab_common.c     | 45 ----------------------------------------
 2 files changed, 44 insertions(+), 50 deletions(-)

Patch

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 1176b30cd4b2..e224a1a9bcbc 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -265,11 +265,50 @@  struct kmem_cache *__kmem_cache_create_args(const char *name,
 struct kmem_cache *__kmem_cache_create(const char *name, unsigned int size,
 				       unsigned int align, slab_flags_t flags,
 				       void (*ctor)(void *));
-struct kmem_cache *kmem_cache_create_usercopy(const char *name,
-			unsigned int size, unsigned int align,
-			slab_flags_t flags,
-			unsigned int useroffset, unsigned int usersize,
-			void (*ctor)(void *));
+
+/**
+ * kmem_cache_create_usercopy - Create a cache with a region suitable
+ * for copying to userspace
+ * @name: A string which is used in /proc/slabinfo to identify this cache.
+ * @size: The size of objects to be created in this cache.
+ * @align: The required alignment for the objects.
+ * @flags: SLAB flags
+ * @useroffset: Usercopy region offset
+ * @usersize: Usercopy region size
+ * @ctor: A constructor for the objects.
+ *
+ * Cannot be called within a interrupt, but can be interrupted.
+ * The @ctor is run when new pages are allocated by the cache.
+ *
+ * The flags are
+ *
+ * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
+ * to catch references to uninitialised memory.
+ *
+ * %SLAB_RED_ZONE - Insert `Red` zones around the allocated memory to check
+ * for buffer overruns.
+ *
+ * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
+ * cacheline.  This can be beneficial if you're counting cycles as closely
+ * as davem.
+ *
+ * Return: a pointer to the cache on success, NULL on failure.
+ */
+static inline struct kmem_cache *
+kmem_cache_create_usercopy(const char *name, unsigned int size,
+			   unsigned int align, slab_flags_t flags,
+			   unsigned int useroffset, unsigned int usersize,
+			   void (*ctor)(void *))
+{
+	struct kmem_cache_args kmem_args = {
+		.align		= align,
+		.ctor		= ctor,
+		.useroffset	= useroffset,
+		.usersize	= usersize,
+	};
+
+	return __kmem_cache_create_args(name, size, &kmem_args, flags);
+}
 
 #define kmem_cache_create(__name, __object_size, __args, ...)           \
 	_Generic((__args),                                              \
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 9133b9fafcb1..3477a3918afd 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -337,51 +337,6 @@  struct kmem_cache *__kmem_cache_create_args(const char *name,
 }
 EXPORT_SYMBOL(__kmem_cache_create_args);
 
-/**
- * kmem_cache_create_usercopy - Create a cache with a region suitable
- * for copying to userspace
- * @name: A string which is used in /proc/slabinfo to identify this cache.
- * @size: The size of objects to be created in this cache.
- * @align: The required alignment for the objects.
- * @flags: SLAB flags
- * @useroffset: Usercopy region offset
- * @usersize: Usercopy region size
- * @ctor: A constructor for the objects.
- *
- * Cannot be called within a interrupt, but can be interrupted.
- * The @ctor is run when new pages are allocated by the cache.
- *
- * The flags are
- *
- * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
- * to catch references to uninitialised memory.
- *
- * %SLAB_RED_ZONE - Insert `Red` zones around the allocated memory to check
- * for buffer overruns.
- *
- * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
- * cacheline.  This can be beneficial if you're counting cycles as closely
- * as davem.
- *
- * Return: a pointer to the cache on success, NULL on failure.
- */
-struct kmem_cache *
-kmem_cache_create_usercopy(const char *name, unsigned int size,
-			   unsigned int align, slab_flags_t flags,
-			   unsigned int useroffset, unsigned int usersize,
-			   void (*ctor)(void *))
-{
-	struct kmem_cache_args kmem_args = {
-		.align		= align,
-		.ctor		= ctor,
-		.useroffset	= useroffset,
-		.usersize	= usersize,
-	};
-
-	return __kmem_cache_create_args(name, size, &kmem_args, flags);
-}
-EXPORT_SYMBOL(kmem_cache_create_usercopy);
-
 /**
  * __kmem_cache_create - Create a cache.
  * @name: A string which is used in /proc/slabinfo to identify this cache.