linux-hardening - Re: [PATCH v2 15/21] mm/slab: move struct kmem_cache

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Message-ID: <ZXEbpvUpmhOBZvuH@localhost.localdomain>
Date: Thu, 7 Dec 2023 10:11:02 +0900
From: Hyeonggon Yoo <42.hyeyoo@...il.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: David Rientjes <rientjes@...gle.com>, Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Marco Elver <elver@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Shakeel Butt <shakeelb@...gle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
	cgroups@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 15/21] mm/slab: move struct kmem_cache_node from
 slab.h to slub.c

On Mon, Nov 20, 2023 at 07:34:26PM +0100, Vlastimil Babka wrote:
> The declaration and associated helpers are not used anywhere else
> anymore.
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  mm/slab.h | 29 -----------------------------
>  mm/slub.c | 27 +++++++++++++++++++++++++++
>  2 files changed, 27 insertions(+), 29 deletions(-)
> 
> diff --git a/mm/slab.h b/mm/slab.h
> index a81ef7c9282d..5ae6a978e9c2 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -588,35 +588,6 @@ static inline size_t slab_ksize(const struct kmem_cache *s)
>  	return s->size;
>  }
>  
> -
> -/*
> - * The slab lists for all objects.
> - */
> -struct kmem_cache_node {
> -	spinlock_t list_lock;
> -	unsigned long nr_partial;
> -	struct list_head partial;
> -#ifdef CONFIG_SLUB_DEBUG
> -	atomic_long_t nr_slabs;
> -	atomic_long_t total_objects;
> -	struct list_head full;
> -#endif
> -};
> -
> -static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
> -{
> -	return s->node[node];
> -}
> -
> -/*
> - * Iterator over all nodes. The body will be executed for each node that has
> - * a kmem_cache_node structure allocated (which is true for all online nodes)
> - */
> -#define for_each_kmem_cache_node(__s, __node, __n) \
> -	for (__node = 0; __node < nr_node_ids; __node++) \
> -		 if ((__n = get_node(__s, __node)))
> -
> -
>  #ifdef CONFIG_SLUB_DEBUG
>  void dump_unreclaimable_slab(void);
>  #else
> diff --git a/mm/slub.c b/mm/slub.c
> index 844e0beb84ee..cc801f8258fe 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -396,6 +396,33 @@ static inline void stat(const struct kmem_cache *s, enum stat_item si)
>  #endif
>  }
>  
> +/*
> + * The slab lists for all objects.
> + */
> +struct kmem_cache_node {
> +	spinlock_t list_lock;
> +	unsigned long nr_partial;
> +	struct list_head partial;
> +#ifdef CONFIG_SLUB_DEBUG
> +	atomic_long_t nr_slabs;
> +	atomic_long_t total_objects;
> +	struct list_head full;
> +#endif
> +};
> +
> +static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
> +{
> +	return s->node[node];
> +}
> +
> +/*
> + * Iterator over all nodes. The body will be executed for each node that has
> + * a kmem_cache_node structure allocated (which is true for all online nodes)
> + */
> +#define for_each_kmem_cache_node(__s, __node, __n) \
> +	for (__node = 0; __node < nr_node_ids; __node++) \
> +		 if ((__n = get_node(__s, __node)))
> +
>  /*
>   * Tracks for which NUMA nodes we have kmem_cache_nodes allocated.
>   * Corresponds to node_state[N_NORMAL_MEMORY], but can temporarily
> 
> -- 

Looks good to me,
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

> 2.42.1
> 
>