netdev - Re: [PATCH 2/4 net-next] tg3: provide frags as skb head

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Message-Id: <20120427.123836.690112554674540119.davem@davemloft.net>
Date:	Fri, 27 Apr 2012 12:38:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	ilpo.jarvinen@...sinki.fi, therbert@...gle.com,
	ncardwell@...gle.com, mcarlson@...adcom.com,
	jeffrey.t.kirsher@...el.com, mchan@...adcom.com,
	herbert@...dor.hengli.com.au, maze@...gle.com
Subject: Re: [PATCH 2/4 net-next] tg3: provide frags as skb head

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Fri, 27 Apr 2012 17:33:06 +0100

> page_address() may return NULL if CONFIG_HIGHMEM is enabled.  And that's
> going to be a general problem with this scheme on 32-bit machines.

It can only be NULL for highmem pages, which he is not going to
get from the kind of page allocation calls he is using.
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