linux-kernel - Re: [PATCH v6 4/6] mm/slab: Introduce kmem_buckets

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Date: Tue, 2 Jul 2024 11:19:28 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Kees Cook <kees@...nel.org>
Cc: "GONG, Ruiqi" <gongruiqi@...weicloud.com>,
 Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
 David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>,
 jvoisin <julien.voisin@...tri.org>, Andrew Morton
 <akpm@...ux-foundation.org>, Roman Gushchin <roman.gushchin@...ux.dev>,
 Hyeonggon Yoo <42.hyeyoo@...il.com>, Xiu Jianfeng <xiujianfeng@...wei.com>,
 Suren Baghdasaryan <surenb@...gle.com>,
 Kent Overstreet <kent.overstreet@...ux.dev>, Jann Horn <jannh@...gle.com>,
 Matteo Rizzo <matteorizzo@...gle.com>, Thomas Graf <tgraf@...g.ch>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, linux-hardening@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v6 4/6] mm/slab: Introduce kmem_buckets_create() and
 family

On 7/1/24 9:13 PM, Kees Cook wrote:
>  #ifdef SLAB_SUPPORTS_SYSFS
>  /*
>   * For a given kmem_cache, kmem_cache_destroy() should only be called
> @@ -931,6 +1023,10 @@ void __init create_kmalloc_caches(void)
>  
>  	/* Kmalloc array is now usable */
>  	slab_state = UP;
> +
> +	kmem_buckets_cache = kmem_cache_create("kmalloc_buckets",
> +					       sizeof(kmem_buckets),
> +					       0, SLAB_NO_MERGE, NULL);

Locally adjusted to put this behind "if (IS_ENABLED(CONFIG_SLAB_BUCKETS))"

>  }
>  
>  /**