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Date:	Wed, 17 Sep 2014 10:48:02 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	xiyou.wangcong@...il.com, davem@...emloft.net,
	netdev@...r.kernel.org, jhs@...atatu.com
Subject: Re: [net-next PATCH v2] net: sched: cls_u32: rcu can not be last
 node

On Wed, 2014-09-17 at 10:31 -0700, John Fastabend wrote:
> tc_u32_sel 'sel' in tc_u_knode expects to be the last element in the
> structure and pads the structure with tc_u32_key fields for each key.
> 
>  kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL)
> 
> CC: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
> ---
>  net/sched/cls_u32.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index eceeb04..8462132 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -64,8 +64,9 @@ struct tc_u_knode {
>  	u32 __percpu		*pcpu_success;
>  #endif
>  	struct tcf_proto	*tp;
> -	struct tc_u32_sel	sel;
>  	struct rcu_head		rcu;
> +	struct tc_u32_sel	sel;
> +	/* tc_u32_keys allocated at end of structure */
>  };
>  
>  struct tc_u_hnode {

Sorry to be picky, but comment should be before 'sel' or at same line.

It should mention that 'sel' MUST be last field.

Thanks !

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