On Thu 07-11-19 12:54:04, Knut Omang wrote:
> With the restructuring done in commit 9adeaa226988
> ("mm, slab: move memcg_cache_params structure to mm/slab.h")
>
> it is no longer possible for code external to mm to access
> the name of a kmem_cache as struct kmem_cache has effectively become
> opaque. Having access to the cache name is helpful to kernel testing
> infrastructure.
>
> Expose a new function kmem_cache_name to mitigate that.
Who is going to use that symbol? It is preferred that a user is added in
the same patch as the newly added symbol.
> Signed-off-by: Knut Omang <knut.omang@xxxxxxxxxx>
> ---
> include/linux/slab.h | 1 +
> mm/slab_common.c | 9 +++++++++
> 2 files changed, 10 insertions(+)
>
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 4d2a2fa55ed5..3298c9db6e46 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -702,6 +702,7 @@ static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
> }
>
> unsigned int kmem_cache_size(struct kmem_cache *s);
> +const char *kmem_cache_name(struct kmem_cache *s);
> void __init kmem_cache_init_late(void);
>
> #if defined(CONFIG_SMP) && defined(CONFIG_SLAB)
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index f9fb27b4c843..269a99dc8214 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -82,6 +82,15 @@ unsigned int kmem_cache_size(struct kmem_cache *s)
> }
> EXPORT_SYMBOL(kmem_cache_size);
>
> +/*
> + * Get the name of a slab object
> + */
> +const char *kmem_cache_name(struct kmem_cache *s)
> +{
> + return s->name;
> +}
> +EXPORT_SYMBOL(kmem_cache_name);
> +
> #ifdef CONFIG_DEBUG_VM
> static int kmem_cache_sanity_check(const char *name, unsigned int size)
> {
> --
> 2.20.1
--
Michal Hocko
SUSE Labs
