On Tue, 2 Feb 2016, Dmitry Safonov wrote:
> diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
> index b7e57927..43634cd 100644
> --- a/include/linux/slub_def.h
> +++ b/include/linux/slub_def.h
> @@ -101,16 +101,6 @@ struct kmem_cache {
> struct kmem_cache_node *node[MAX_NUMNODES];
> };
>
> -#ifdef CONFIG_SYSFS
> -#define SLAB_SUPPORTS_SYSFS
> -void sysfs_slab_remove(struct kmem_cache *);
> -#else
> -static inline void sysfs_slab_remove(struct kmem_cache *s)
> -{
> -}
> -#endif
> -
> -
> /**
> * virt_to_obj - returns address of the beginning of object.
> * @s: object's kmem_cache
> diff --git a/mm/slab.h b/mm/slab.h
> index 834ad24..2983ab2 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -367,6 +367,14 @@ static inline struct kmem_cache_node *get_node(struct
> kmem_cache *s, int node)
>
> #endif
>
> +#if defined(CONFIG_SLUB) && defined(CONFIG_SYSFS)
> +void sysfs_slab_remove(struct kmem_cache *);
> +#else
> +static inline void sysfs_slab_remove(struct kmem_cache *s)
> +{
> +}
> +#endif
> +
> void *slab_start(struct seq_file *m, loff_t *pos);
> void *slab_next(struct seq_file *m, void *p, loff_t *pos);
> void slab_stop(struct seq_file *m, void *p);
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index b50aef0..6725eb3 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -468,13 +468,8 @@ static void release_caches(struct list_head *release,
> bool need_rcu_barrier)
> if (need_rcu_barrier)
> rcu_barrier();
>
> - list_for_each_entry_safe(s, s2, release, list) {
> -#ifdef SLAB_SUPPORTS_SYSFS
> - sysfs_slab_remove(s);
> -#else
> + list_for_each_entry_safe(s, s2, release, list)
> slab_kmem_cache_release(s);
> -#endif
> - }
> }
>
> #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
> @@ -614,6 +609,9 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *memcg)
> list_for_each_entry_safe(s, s2, &slab_caches, list) {
> if (is_root_cache(s) || s->memcg_params.memcg != memcg)
> continue;
> +
> + sysfs_slab_remove(s);
> +
I would have expected to have seen this added to shutdown_cache() instead.
> /*
> * The cgroup is about to be freed and therefore has no charges
> * left. Hence, all its caches must be empty by now.
> diff --git a/mm/slub.c b/mm/slub.c
> index 2e1355a..b6a68b7 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -5296,11 +5296,6 @@ static void memcg_propagate_slab_attrs(struct
> kmem_cache *s)
> #endif
> }
>
> -static void kmem_cache_release(struct kobject *k)
> -{
> - slab_kmem_cache_release(to_slab(k));
> -}
> -
> static const struct sysfs_ops slab_sysfs_ops = {
> .show = slab_attr_show,
> .store = slab_attr_store,
> @@ -5308,7 +5303,6 @@ static const struct sysfs_ops slab_sysfs_ops = {
>
> static struct kobj_type slab_ktype = {
> .sysfs_ops = &slab_sysfs_ops,
> - .release = kmem_cache_release,
> };
>
> static int uevent_filter(struct kset *kset, struct kobject *kobj)
