On Tue, 27 Mar 2018, Shakeel Butt wrote:
> diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
> index 49fffb0ca83b..135ce2838c89 100644
> --- a/mm/kasan/kasan.c
> +++ b/mm/kasan/kasan.c
> @@ -382,7 +382,8 @@ void kasan_cache_shrink(struct kmem_cache *cache)
>
> void kasan_cache_shutdown(struct kmem_cache *cache)
> {
> - quarantine_remove_cache(cache);
> + if (!__kmem_cache_empty(cache))
> + quarantine_remove_cache(cache);
> }
>
> size_t kasan_metadata_size(struct kmem_cache *cache)
> diff --git a/mm/slab.c b/mm/slab.c
> index 9212c64bb705..b59f2cdf28d1 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -2291,6 +2291,18 @@ static int drain_freelist(struct kmem_cache *cache,
> return nr_freed;
> }
>
> +bool __kmem_cache_empty(struct kmem_cache *s)
> +{
> + int node;
> + struct kmem_cache_node *n;
> +
> + for_each_kmem_cache_node(s, node, n)
> + if (!list_empty(&n->slabs_full) ||
> + !list_empty(&n->slabs_partial))
> + return false;
> + return true;
> +}
> +
> int __kmem_cache_shrink(struct kmem_cache *cachep)
> {
> int ret = 0;
> diff --git a/mm/slab.h b/mm/slab.h
> index e8981e811c45..68bdf498da3b 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -166,6 +166,7 @@ static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
> SLAB_TEMPORARY | \
> SLAB_ACCOUNT)
>
> +bool __kmem_cache_empty(struct kmem_cache *);
> int __kmem_cache_shutdown(struct kmem_cache *);
> void __kmem_cache_release(struct kmem_cache *);
> int __kmem_cache_shrink(struct kmem_cache *);
> diff --git a/mm/slub.c b/mm/slub.c
> index 1edc8d97c862..44aa7847324a 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -3707,6 +3707,17 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
> discard_slab(s, page);
> }
>
> +bool __kmem_cache_empty(struct kmem_cache *s)
> +{
> + int node;
> + struct kmem_cache_node *n;
> +
> + for_each_kmem_cache_node(s, node, n)
> + if (n->nr_partial || slabs_node(s, node))
> + return false;
> + return true;
> +}
> +
> /*
> * Release all resources used by a slab cache.
> */
Any reason not to just make quarantine_remove_cache() part of
__kmem_cache_shutdown() instead of duplicating its logic?
