netdev - Re: [PATCH v2 2/2] sctp: optimize the sctp_sysctl_net

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Date:	Tue, 11 Feb 2014 19:47:20 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Wang Weidong <wangweidong1@...wei.com>, nhorman@...driver.com,
	davem@...emloft.net, vyasevich@...il.com
CC:	dborkman@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/2] sctp: optimize the sctp_sysctl_net_register

Hello.

On 02/11/2014 04:49 AM, Wang Weidong wrote:

> Here, when the net is init_net, we needn't to kmemdup the ctl_table
> again. So add a check for net. Also we can save some memory.

> Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
> ---
>   net/sctp/sysctl.c | 16 +++++++++-------
>   1 file changed, 9 insertions(+), 7 deletions(-)

> diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
> index 2ddb401..b65396b 100644
> --- a/net/sctp/sysctl.c
> +++ b/net/sctp/sysctl.c
> @@ -403,15 +403,17 @@ static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
>
>   int sctp_sysctl_net_register(struct net *net)
>   {
> -	struct ctl_table *table;
> -	int i;
> +	struct ctl_table *table = sctp_net_table;
>
> -	table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
> -	if (!table)
> -		return -ENOMEM;
> +	if (!net_eq(net, &init_net)) {
> +		int i;

    Empty line after declaration wouldn't hurt, just like above.

> +		table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
> +		if (!table)
> +			return -ENOMEM;

WBR, Sergei

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