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Date:	Mon, 10 Nov 2014 09:02:35 -0800
From:	Eric Dumazet <>
To:	David Vrabel <>
Cc:	Zoltan Kiss <>,,
	"David S. Miller" <>,
	Konrad Rzeszutek Wilk <>,
	Boris Ostrovsky <>,
	Stefan Bader <>,
	Jay Vosburgh <>,,
Subject: Re: [Xen-devel] BUG in xennet_make_frags with paged skb data

On Mon, 2014-11-10 at 16:42 +0000, David Vrabel wrote:
> On 10/11/14 16:39, Zoltan Kiss wrote:
> > 
> > The BUG_ON suggested by Stefan would be still reasonable:
> > 
> > BUG_ON(((page-compound_head(page))*PAGE_SIZE)+offset+len >
> > PAGE_SIZE<<compound_order(compound_head(page)));
> Well, it wouldn't trigger but I don't think it is useful any more.


This BUG_ON() does not make sense (its current implementation is
assuming a very precise layout anyway)

If we really wanted some debugging, we would need something more generic
and done in core networking stack, not in a particular driver.

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