linux-kernel - Re: [PATCH v7 02/21] slab: simplify init_kmem_cache

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aLjuLRHHfEmJ2tRf@hyeyoo>
Date: Thu, 4 Sep 2025 10:41:01 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Suren Baghdasaryan <surenb@...gle.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Christoph Lameter <cl@...two.org>,
        David Rientjes <rientjes@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Uladzislau Rezki <urezki@...il.com>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        maple-tree@...ts.infradead.org
Subject: Re: [PATCH v7 02/21] slab: simplify init_kmem_cache_nodes() error
 handling

On Wed, Sep 03, 2025 at 02:59:44PM +0200, Vlastimil Babka wrote:
> We don't need to call free_kmem_cache_nodes() immediately when failing
> to allocate a kmem_cache_node, because when we return 0,
> do_kmem_cache_create() calls __kmem_cache_release() which also performs
> free_kmem_cache_nodes().
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Looks good to me,
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>

> ---
>  mm/slub.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 30003763d224c2704a4b93082b8b47af12dcffc5..9f671ec76131c4b0b28d5d568aa45842b5efb6d4 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -5669,10 +5669,8 @@ static int init_kmem_cache_nodes(struct kmem_cache *s)
>  		n = kmem_cache_alloc_node(kmem_cache_node,
>  						GFP_KERNEL, node);
>  
> -		if (!n) {
> -			free_kmem_cache_nodes(s);
> +		if (!n)
>  			return 0;
> -		}
>  
>  		init_kmem_cache_node(n);
>  		s->node[node] = n;
> 
> -- 
> 2.51.0
> 
> 

-- 
Cheers,
Harry / Hyeonggon