netdev - Re: BUG: using smp_processor_id() in preemptible [00000000] code: avahi-daemon: caller is netif

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Message-ID: <u2o412e6f7f1004150047nc9250ffuaef68be066a7575c@mail.gmail.com>
Date:	Thu, 15 Apr 2010 15:47:26 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, therbert@...gle.com, eparis@...hat.com,
	netdev@...r.kernel.org
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code: 
	avahi-daemon: caller is netif_rx

On Thu, Apr 15, 2010 at 3:37 PM, David Miller <davem@...emloft.net> wrote:
> From: Changli Gao <xiaosuo@...il.com>
> Date: Thu, 15 Apr 2010 15:30:44 +0800
>
>> Should netif_rx() be used only when preemption is disabled? If not,
>> netif_rx_ni() should be used instead.?
>
> netif_rx() must be invoked from a hardware or software interrupt,
> which implies preemption disabled.
>
> In netif_rx_ni(), the "ni" means "not interrupt".
>

yea, I know netif_rx_ni()'s meaning. It means that the following
changes aren't necessary.

 #else
-       cpu = smp_processor_id();
+       ret = enqueue_to_backlog(skb, get_cpu());
+       put_cpu();

ret = enqueue_to_backlog(skb, smp_processor_id()); should be OK.

 #endif
-
-       return enqueue_to_backlog(skb, cpu);
+       return ret;
 }
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