From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next-2.6] sfc: Reduce size of efx_rx_buffer by
 unionising skb and page
Date: Tue, 01 Mar 2011 12:24:59 -0800 (PST)
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From: Ben Hutchings <bhutchings@solarflare.com>
Date: Tue, 01 Mar 2011 01:21:30 +0000

> From: Steve Hodgson <shodgson@solarflare.com>
> 
> [bwh: Forward-ported to net-next-2.6.]
> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

I'm going to apply this, but you can take this further by making
the buffer an "unsigned long" and encode the pointer plus a one-bit
binary state there to indicate what it is.