linux-kernel - Re: [PATCH 3/3] mm/slab: Fix /proc/slabinfo unwriteable for slab

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Date:	Mon, 1 Jul 2013 15:49:54 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	Glauber Costa <glommer@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm/slab: Fix /proc/slabinfo unwriteable for slab

On Mon, 24 Jun 2013, Wanpeng Li wrote:

>  1 file changed, 10 insertions(+)
>
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index d161b81..7fdde79 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -631,10 +631,20 @@ static const struct file_operations proc_slabinfo_operations = {
>  	.release	= seq_release,
>  };
>
> +#ifdef CONFIG_SLAB
> +static int __init slab_proc_init(void)
> +{
> +	proc_create("slabinfo", S_IWUSR | S_IRUSR, NULL, &proc_slabinfo_operations);
> +	return 0;
> +}
> +#endif
> +#ifdef CONFIG_SLUB
>  static int __init slab_proc_init(void)
>  {
>  	proc_create("slabinfo", S_IRUSR, NULL, &proc_slabinfo_operations);
>  	return 0;
>  }

It may be easier to define a macro SLABINFO_RIGHTS and use #ifdefs to
assign the correct one. That way we have only one slab_proc_init().
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