From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH 3/4 net-next] net: make GRO aware of skb->head_frag
Date: Mon, 30 Apr 2012 19:54:06 +0200
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On Fri, 2012-04-27 at 12:37 +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@google.com>
> 
...

> +		first_offset = skb->head -
> +			       (unsigned char *)page_address(page) +
> +			       offset;
> +
> +		pinfo->nr_frags = nr_frags + 1 + skbinfo->nr_frags;
> +

Oops. I realize this is a previous version of this patch.  

skb->head should be changed by skb->data here, I'll post a v2 for this
GRO change.