slab: remove kmem_cache_create_rcu()

Now that we have ported all users of kmem_cache_create_rcu() to struct
kmem_cache_args the function is unused and can be removed.

Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 15eb0a0defd633d71e3f4a86e2ae13dc9d86db5e..cb82a6414a289c4bcd1133f9c77b74192a91696f 100644 (file)
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -271,9 +271,6 @@ struct kmem_cache *kmem_cache_create_usercopy(const char *name,
                        slab_flags_t flags,
                        unsigned int useroffset, unsigned int usersize,
                        void (*ctor)(void *));
-struct kmem_cache *kmem_cache_create_rcu(const char *name, unsigned int size,
-                                        unsigned int freeptr_offset,
-                                        slab_flags_t flags);
 
 /* If NULL is passed for @args, use this variant with default arguments. */
 static inline struct kmem_cache *

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 41845992767004e1adb79dd2a7bfc82b798883e2..9133b9fafcb127eeb2d8bfbd9e44a962e5d60c14 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -420,49 +420,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, unsigned int size,
 }
 EXPORT_SYMBOL(__kmem_cache_create);
 
-/**
- * kmem_cache_create_rcu - Create a SLAB_TYPESAFE_BY_RCU cache.
- * @name: A string which is used in /proc/slabinfo to identify this cache.
- * @size: The size of objects to be created in this cache.
- * @freeptr_offset: The offset into the memory to the free pointer
- * @flags: SLAB flags
- *
- * Cannot be called within an interrupt, but can be interrupted.
- *
- * See kmem_cache_create() for an explanation of possible @flags.
- *
- * By default SLAB_TYPESAFE_BY_RCU caches place the free pointer outside
- * of the object. This might cause the object to grow in size. Callers
- * that have a reason to avoid this can specify a custom free pointer
- * offset in their struct where the free pointer will be placed.
- *
- * Note that placing the free pointer inside the object requires the
- * caller to ensure that no fields are invalidated that are required to
- * guard against object recycling (See SLAB_TYPESAFE_BY_RCU for
- * details.).
- *
- * Using zero as a value for @freeptr_offset is valid. To request no
- * offset UINT_MAX must be specified.
- *
- * Note that @ctor isn't supported with custom free pointers as a @ctor
- * requires an external free pointer.
- *
- * Return: a pointer to the cache on success, NULL on failure.
- */
-struct kmem_cache *kmem_cache_create_rcu(const char *name, unsigned int size,
-                                        unsigned int freeptr_offset,
-                                        slab_flags_t flags)
-{
-       struct kmem_cache_args kmem_args = {
-               .freeptr_offset         = freeptr_offset,
-               .use_freeptr_offset     = true,
-       };
-
-       return __kmem_cache_create_args(name, size, &kmem_args,
-                                       flags | SLAB_TYPESAFE_BY_RCU);
-}
-EXPORT_SYMBOL(kmem_cache_create_rcu);
-
 static struct kmem_cache *kmem_buckets_cache __ro_after_init;
 
 /**