netdev - Re: [net-next PATCH] net: sched: cls

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Message-ID: <541921FD.1090203@hartkopp.net>
Date:	Wed, 17 Sep 2014 07:54:05 +0200
From:	Oliver Hartkopp <socketcan@...tkopp.net>
To:	John Fastabend <john.fastabend@...il.com>,
	xiyou.wangcong@...il.com, davem@...emloft.net,
	eric.dumazet@...il.com
CC:	netdev@...r.kernel.org, jhs@...atatu.com
Subject: Re: [net-next PATCH] net: sched: cls_u32: rcu can not be last node

Please add an appropriate comment to the *code* to prevent this knowledge to
disappear. No one will search/find this in git commit messages next time.

Tnx
Oliver

On 17.09.2014 07:34, 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 |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index eceeb04..be24e7e 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -64,8 +64,8 @@ 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;
>  };
>  
>  struct tc_u_hnode {
> 
> --
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