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slab: create kmem_cache_create() compatibility layer

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Use _Generic() to create a compatibility layer that type switches on the
third argument to either call __kmem_cache_create() or
__kmem_cache_create_args(). If NULL is passed for the struct
kmem_cache_args argument use default args making porting for callers
that don't care about additional arguments easy.

Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Christian Brauner
2024-09-05 09:56:55 +02:00
committed by Vlastimil Babka
parent 199cd13a74
commit b2e7456b5c
2 changed files with 31 additions and 8 deletions
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29
include/linux/slab.h
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@@ -262,9 +262,10 @@ struct kmem_cache *__kmem_cache_create_args(const char *name,
unsigned int object_size,
struct kmem_cache_args *args,
slab_flags_t flags);
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(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,
@@ -273,6 +274,28 @@ struct kmem_cache *kmem_cache_create_usercopy(const char *name,
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 *
__kmem_cache_default_args(const char *name, unsigned int size,
struct kmem_cache_args *args,
slab_flags_t flags)
{
struct kmem_cache_args kmem_default_args = {};
/* Make sure we don't get passed garbage. */
if (WARN_ON_ONCE(args))
return ERR_PTR(-EINVAL);
return __kmem_cache_create_args(name, size, &kmem_default_args, flags);
}
#define kmem_cache_create(__name, __object_size, __args, ...) \
_Generic((__args), \
struct kmem_cache_args *: __kmem_cache_create_args, \
void *: __kmem_cache_default_args, \
default: __kmem_cache_create)(__name, __object_size, __args, __VA_ARGS__)
void kmem_cache_destroy(struct kmem_cache *s);
int kmem_cache_shrink(struct kmem_cache *s);