netdev - Re: [PATCH net] rtnetlink: fix frame size warning in rtnl_fill

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Date:	Tue, 17 Nov 2015 05:10:00 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net] rtnetlink: fix frame size warning in
 rtnl_fill_ifinfo

On Tue, 2015-11-17 at 13:48 +0100, Hannes Frederic Sowa wrote:
> Fix the following warning:
> 
>   CC      net/core/rtnetlink.o
> net/core/rtnetlink.c: In function ‘rtnl_fill_ifinfo’:
> net/core/rtnetlink.c:1308:1: warning: the frame size of 2864 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>  }
>  ^
> by splitting up the huge rtnl_fill_ifinfo into some smaller ones, so we
> don't have the huge frame allocations at the same time.
> 
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> ---
>  net/core/rtnetlink.c | 274 ++++++++++++++++++++++++++++-----------------------
>  1 file changed, 152 insertions(+), 122 deletions(-)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 504bd17..6f1c181 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -1045,15 +1045,156 @@ static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
>  	return 0;
>  }
>  
> +static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
> +					      struct net_device *dev)
> +{
> +	struct nlattr *attr;
> +	struct rtnl_link_stats64 temp;
> +	const struct rtnl_link_stats64 *stats;
> +

Please reorder this in opposite way : longest lines first



> +
> +static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
> +					       struct net_device *dev,
> +					       int vfs_num,
> +					       struct nlattr *vfinfo)
> +{
> +	struct nlattr *vf, *vfstats;
> +	struct ifla_vf_info ivi;
> +	struct ifla_vf_mac vf_mac;
> +	struct ifla_vf_vlan vf_vlan;
> +	struct ifla_vf_rate vf_rate;
> +	struct ifla_vf_tx_rate vf_tx_rate;
> +	struct ifla_vf_spoofchk vf_spoofchk;
> +	struct ifla_vf_link_state vf_linkstate;
> +	struct ifla_vf_rss_query_en vf_rss_query_en;
> +	struct ifla_vf_stats vf_stats;
> +	struct ifla_vf_trust vf_trust;

Same here.

Thanks.


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