netdev - Re: [Patch net-next v3] net: fix some RCU warnings in various places

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Date:	Fri, 15 Feb 2013 22:23:24 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>,
	Vlad Yasevich <vyasevic@...hat.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next v3] net: fix some RCU warnings in various places

On Sat, 2013-02-16 at 13:48 +0800, Cong Wang wrote:
> From: Cong Wang <amwang@...hat.com>
> 
> This fixes sparse warnings like the one below:

>  static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
> @@ -469,7 +469,7 @@ extern void br_multicast_free_pg(struct rcu_head *head);
>  extern struct net_bridge_port_group *br_multicast_new_port_group(
>  				struct net_bridge_port *port,
>  				struct br_ip *group,
> -				struct net_bridge_port_group *next,
> +				struct net_bridge_port_group __rcu *next,
>  				unsigned char state);
>  extern void br_mdb_init(void);
>  extern void br_mdb_uninit(void);

This part is wrong, please remove the __rcu annotation in function
definition.

To perform " rcu_assign_pointer(p->next, next); ", there is no need to
annotate "next" with __rcu



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