[PATCH 2/8] ARM: Implement read/write for ownership in theARMv6 DMA cache ops

[Catalin Marinas]

On Thu, 2010-05-13 at 14:54 +0100, George G. Davis wrote:
> Hi,
> 
> On Thu, May 13, 2010 at 09:26:57AM +0100, Catalin Marinas wrote:
> > On Thu, 2010-05-13 at 06:27 +0100, Ronen Shitrit wrote:
> > > Our ARM v6 does have speculative prefetch...
> >
> > That's the I-cache and we should be ok with it. What may affect this
> > patch is speculative fetches into the D-cache.
> 
> prefetch()?

Drivers should not use prefetch (PLD) on memory handed over to a device
for DMA transfers. To me this is like explicitly accessing such memory
during a DMA transfer.

-- 
Catalin