linux-kernel - Re: [Devel] [PATCH 1/6] slab: cleanup kmem_cache_create

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Message-ID: <52B2AB7C.1010803@parallels.com>
Date:	Thu, 19 Dec 2013 12:17:00 +0400
From:	Vasily Averin <vvs@...allels.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
CC:	Michal Hocko <mhocko@...e.cz>, Glauber Costa <glommer@...il.com>,
	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>,
	cgroups@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>, devel@...nvz.org
Subject: Re: [Devel] [PATCH 1/6] slab: cleanup kmem_cache_create_memcg()

On 12/18/2013 05:16 PM, Vladimir Davydov wrote:
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -176,8 +176,9 @@ kmem_cache_create_memcg(struct mem_cgroup *memcg, const char *name, size_t size,
>  	get_online_cpus();
>  	mutex_lock(&slab_mutex);
>  
> -	if (!kmem_cache_sanity_check(memcg, name, size) == 0)
> -		goto out_locked;
> +	err = kmem_cache_sanity_check(memcg, name, size);
> +	if (err)
> +		goto out_unlock;
>  
>  	/*
>  	 * Some allocators will constraint the set of valid flags to a subset

Theoretically in future kmem_cache_sanity_check() can return positive value.
Probably it's better to check (err < 0) in caller ?

Thank you,
	Vasily Averin
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