netdev - Re: [PATCH v2] gianfar: Add I/O barriers when touching buffer descriptor ownership.

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Message-ID: <463902EB.8070401@freescale.com>
Date:	Wed, 02 May 2007 16:30:19 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	jgarzik@...ox.com, netdev@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH v2] gianfar: Add I/O barriers when touching buffer descriptor
 ownership.

Kumar Gala wrote:
> Why doesn't marking the bdp pointer volatile resolve the issue in  
> gfar_clean_rx_ring() to ensure load ordering?

Because that only addresses compiler reordering (and does so in a rather 
clumsy way -- not all accesses need to be strongly ordered), not 
hardware reordering.

-Scott
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