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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 - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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