netdev - Re: NOHZ: local_softirq

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Date:	Mon, 12 Oct 2009 10:28:56 +0200
From:	Tilman Schmidt <tilman@...p.cc>
To:	Johannes Berg <johannes@...solutions.net>
CC:	Dave Young <hidave.darkstar@...il.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, linux-ppp@...r.kernel.org,
	netdev@...r.kernel.org, Paul Mackerras <paulus@...ba.org>
Subject: Re: NOHZ: local_softirq_pending 08

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[CCing PPP people]

Am 11.10.2009 13:40 schrieb Johannes Berg:
> On Sun, 2009-10-11 at 13:18 +0200, Tilman Schmidt wrote:
> 
>> Can you explain a bit more what that message is about?
>> I am encountering it in a completely different context
>> (PPP over ISDN) [...]
> 
> Basically, calling netif_rx() with softirqs enabled.

AFAICS that would have to be the netif_rx() call in
ppp_receive_nonmp_frame() [drivers/net/ppp_generic.c#L1791],
called (via others) from the tasklet work function
ppp_sync_process() [drivers/net/ppp_synctty.c#L545].
Should that be changed to the
"if (in_interrupt()) netif_rx(skb) else netif_rx_ni(skb)"
stanza from the linux.kernel.wireless.general thread then?

Thanks,
Tilman

- --
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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