From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [RFC,PATCH] loopback: calls netif_receive_skb() instead of
 netif_rx()
Date: Sat, 29 Mar 2008 16:54:15 -0700 (PDT)
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From: Eric Dumazet <dada1@cosmosbay.com>
Date: Sat, 29 Mar 2008 09:18:03 +0100

> BTW, can loopback_xmit() be called on an interrupt stack ?

Absolutely, softirq processes TCP data, ACK goes out in
softirq context.

Softirqs run on interrupt stacks just as hardirqs do.