netdev - Re: [RFC PATCH 01/15] net: qdisc: use rcu prefix and silence sparse warnings

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Message-ID: <1398877228.29914.177.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 30 Apr 2014 10:00:28 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	xiyou.wangcong@...il.com, jhs@...atatu.com, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [RFC PATCH 01/15] net: qdisc: use rcu prefix and silence sparse
 warnings

On Wed, 2014-04-30 at 09:35 -0700, John Fastabend wrote:

>  static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
>  {
> -	return qdisc->dev_queue->qdisc;
> +	struct Qdisc *q = rcu_dereference(qdisc->dev_queue->qdisc);
> +
> +	return q;
>  }
>  

Hmm... I am pretty sure this can be called without rcu_read_lock()

rcu_dereference_rtnl() would be more appropriate here I think.


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